HB, OTA etc

backend/build.gradle.kts

@@ -20,6 +20,7 @@ dependencies {
     implementation("ch.qos.logback:logback-classic:1.4.14")
     implementation("org.mariadb.jdbc:mariadb-java-client:3.3.3")
     implementation("com.zaxxer:HikariCP:5.1.0")
+    implementation("io.ktor:ktor-server-compression:2.3.7")
     testImplementation(kotlin("test"))
 }
 
@@ -44,3 +45,48 @@ tasks.processResources {
         into("db/migration")
     }
 }
+
+tasks.register("deploy") {
+    dependsOn("jar")
+
+    doLast {
+        val jarFile = file("build/libs/backend.jar")
+
+        if (!jarFile.exists()) {
+            throw GradleException("Jar not found: ${jarFile.absolutePath}")
+        }
+
+        fun runCommand(vararg cmd: String) {
+            println("Running: ${cmd.joinToString(" ")}")
+
+            val process = ProcessBuilder(*cmd)
+                .inheritIO()
+                .start()
+
+            val exitCode = process.waitFor()
+            if (exitCode != 0) {
+                throw GradleException("Command failed: ${cmd.joinToString(" ")}")
+            }
+        }
+
+        // upload
+        runCommand(
+            "scp",
+            jarFile.absolutePath,
+            "home-iot:/tmp/backend.jar"
+        )
+
+        // deploy
+        runCommand(
+            "ssh",
+            "home-iot",
+            "sudo mv /tmp/backend.jar /opt/iot-backend/app.jar && sudo systemctl restart iot-backend"
+        )
+
+        runCommand("ssh",
+            "home-iot",
+            "systemctl status iot-backend --no-pager")
+
+        println("Deploy completed")
+    }
+}

backend/src/main/kotlin/org/pavloveugene/iot/backend/Application.kt

@@ -15,42 +15,32 @@ import org.pavloveugene.iot.backend.db.Migration
 import org.pavloveugene.iot.backend.db.runMigrations
 import java.time.Duration
 import org.pavloveugene.iot.backend.routes.*
+import org.pavloveugene.iot.backend.services.executeCleanup
+import org.pavloveugene.iot.backend.services.runNormalizeLoop
+import org.pavloveugene.iot.backend.services.startKtorServer
+import kotlin.system.exitProcess
 
-fun main() {
+fun main(args: Array<String>) {
-    Database.dataSource
+
+    Database.init()
 
     runMigrations()
 
-    val server = embeddedServer(
+    val mode = args.firstOrNull()
-        Netty,
+
-        port = AppConfig.serverPort,
+    when (mode) {
-        host = AppConfig.serverHost,
+        "--normalize-data", "normalize-data" -> {
-    ) {
+            runNormalizeLoop()
-        install(ContentNegotiation) {
-            json()
         }
 
-        install(WebSockets) {
+        "--cleanup", "cleanup" -> {
-            pingPeriod = Duration.ofSeconds(15)
+            executeCleanup()
-            timeout = Duration.ofSeconds(30)
-            maxFrameSize = Long.MAX_VALUE
-            masking = false
         }
 
-        routing {
+        else -> {
-            protocolRoutes()
+            startKtorServer()
-            protocolWebSocket()
         }
     }
 
-    Runtime.getRuntime().addShutdownHook(Thread {
+    exitProcess(0)
-        println("Shutting down...")
-        try {
-            server.stop(1000, 2000)
-        } catch (e: Exception) {
-            println("Shutdown error: ${e.message}")
-        }
-    })
-
-    server.start(wait = true)
 }

backend/src/main/kotlin/org/pavloveugene/iot/backend/db/Database.kt

@@ -3,9 +3,13 @@ package org.pavloveugene.iot.backend.db
 import com.zaxxer.hikari.HikariConfig
 import com.zaxxer.hikari.HikariDataSource
 import org.pavloveugene.iot.backend.config.AppConfig
+import java.sql.Statement
 import kotlin.getValue
 
 object Database {
+    fun init() {
+        val ds = dataSource;
+    }
 
     val dataSource: HikariDataSource by lazy {
         val config = HikariConfig().apply {
@@ -20,9 +24,93 @@ object Database {
             idleTimeout = 30000
             maxLifetime = 1800000
 
-            isAutoCommit = false
+            isAutoCommit = true
         }
 
         HikariDataSource(config)
     }
+
+    fun execute(sql: String, params: List<Any?> = emptyList()): Int {
+        dataSource.connection.use { conn ->
+            conn.prepareStatement(sql).use { stmt ->
+
+                params.forEachIndexed { i, p ->
+                    stmt.setObject(i + 1, p)
+                }
+
+                return stmt.executeUpdate()
+            }
+        }
+    }
+
+    fun queryOne(sql: String, params: List<Any?> = emptyList()): Map<String, Any?>? {
+        dataSource.connection.use { conn ->
+            conn.prepareStatement(sql).use { stmt ->
+
+                params.forEachIndexed { i, p ->
+                    stmt.setObject(i + 1, p)
+                }
+
+                val rs = stmt.executeQuery()
+                if (!rs.next()) return null
+
+                val meta = rs.metaData
+                val map = mutableMapOf<String, Any?>()
+
+                for (i in 1..meta.columnCount) {
+                    map[meta.getColumnLabel(i)] = rs.getObject(i)
+                }
+
+                return map
+            }
+        }
+    }
+
+    fun query(sql: String, params: List<Any?> = emptyList()): List<Map<String, Any?>> {
+        dataSource.connection.use { conn ->
+            conn.prepareStatement(sql).use { stmt ->
+
+                params.forEachIndexed { i, p ->
+                    stmt.setObject(i + 1, p)
+                }
+
+                val rs = stmt.executeQuery()
+                val meta = rs.metaData
+
+                val result = mutableListOf<Map<String, Any?>>()
+
+                while (rs.next()) {
+                    val map = mutableMapOf<String, Any?>()
+
+                    for (i in 1..meta.columnCount) {
+                        map[meta.getColumnLabel(i)] = rs.getObject(i)
+                    }
+
+                    result.add(map)
+                }
+
+                return result
+            }
+        }
+    }
+
+    fun insertAndReturnId(sql: String, params: List<Any?> = emptyList()): Long {
+        dataSource.connection.use { conn ->
+            conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS).use { stmt ->
+
+                params.forEachIndexed { i, p ->
+                    stmt.setObject(i + 1, p)
+                }
+
+                stmt.executeUpdate()
+
+                val rs = stmt.generatedKeys
+                if (rs.next()) {
+                    return rs.getLong(1)
+                } else {
+                    error("No generated key")
+                }
+            }
+        }
+    }
 }

backend/src/main/kotlin/org/pavloveugene/iot/backend/dto/EventDto.kt

@@ -0,0 +1,8 @@
+package org.pavloveugene.iot.backend.dto
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class EventDto (
+    val type: String
+)

backend/src/main/kotlin/org/pavloveugene/iot/backend/routes/FirmwareRoutes.kt

@@ -0,0 +1,134 @@
+package org.pavloveugene.iot.backend.routes
+
+import io.ktor.http.HttpStatusCode
+import io.ktor.http.content.PartData
+import io.ktor.http.content.forEachPart
+import io.ktor.http.content.streamProvider
+import io.ktor.server.application.call
+import io.ktor.server.request.receiveMultipart
+import io.ktor.server.response.respond
+import io.ktor.server.response.respondFile
+import io.ktor.server.routing.Route
+import io.ktor.server.routing.get
+import io.ktor.server.routing.post
+import org.pavloveugene.iot.backend.db.Database
+import java.io.File
+
+fun Route.firmwareRouting() {
+    uploadFirmware()
+    getFirmware()
+    post("/ota_trigger") {
+        // send WS command
+    }
+}
+
+fun Route.uploadFirmware() {
+    post("/firmware_upload") {
+        val multipart = call.receiveMultipart()
+
+        var deviceId: Long? = null
+        var version: Int
+        var fileBytes: ByteArray? = null
+
+        multipart.forEachPart { part ->
+            when (part) {
+                is PartData.FormItem -> {
+                    when (part.name) {
+                        "device_id" -> deviceId = part.value.toLong()
+                    }
+                }
+
+                is PartData.FileItem -> {
+                    fileBytes = part.streamProvider().readBytes()
+                }
+
+                else -> {}
+
+            }
+
+            part.dispose()
+        }
+
+        if (deviceId == null || fileBytes == null) {
+            call.respond(HttpStatusCode.BadRequest, "Missing fields")
+            return@post
+        }
+
+        // 👉 генерим имя файла
+        val filename = "${java.util.UUID.randomUUID()}.bin"
+        val path = "storage/firmware/$filename"
+
+        // 👉 сохраняем файл
+        java.io.File(path).apply {
+            parentFile.mkdirs()
+            writeBytes(fileBytes!!)
+        }
+
+        // 👉 считаем sha256
+        val sha256 = java.security.MessageDigest
+            .getInstance("SHA-256")
+            .digest(fileBytes!!)
+            .joinToString("") { "%02x".format(it) }
+
+        // 👉 сохраняем в БД
+        while (true) {
+            version = ((Database.queryOne(
+                """
+    select coalesce(max(version), 0) + 1 as v
+    from firmware
+    where device_id = ?
+    """,
+                listOf(deviceId)
+            )?.get("v") as Number?)?.toInt() ?: 1)
+
+            try {
+                Database.execute(
+                    """
+            insert into firmware (device_id, version, path, sha256, size)
+            values (?, ?, ?, ?, ?)
+        """, listOf(
+                        deviceId,
+                        version,
+                        path,
+                        sha256,
+                        fileBytes.size
+                    )
+                )
+
+                break
+            } catch (e: Exception) {
+                println("Retry insert firmware: ${e.message}")
+            }
+        }
+
+        call.respond(
+            mapOf(
+                "status" to "ok",
+                "filename" to filename,
+                "version" to version,
+            )
+        )
+    }
+}
+
+fun Route.getFirmware() {
+    get("/firmware/download") {
+        val id = call.parameters["id"]!!.toInt()
+
+        val row = Database.queryOne(
+            "select path from firmware where id=?",
+            listOf(id)
+        )
+        if (row == null) {
+            return@get call.respond(HttpStatusCode.NotFound)
+        }
+
+        val path = row["path"] as String
+        val file = File(path)
+
+        if (!file.exists()) {
+            return@get call.respond(HttpStatusCode.NotFound)
+        }
+        call.respondFile(file)
+    }
+}

backend/src/main/kotlin/org/pavloveugene/iot/backend/routes/ProtocolRoutes.kt

@@ -7,29 +7,20 @@ import io.ktor.server.response.*
 import io.ktor.server.routing.*
 import io.ktor.http.*
 import kotlinx.serialization.json.Json
-import org.pavloveugene.iot.backend.dto.TelemetryDto
-import kotlinx.serialization.json.decodeFromJsonElement
 import org.pavloveugene.iot.backend.config.AppConfig
 import org.pavloveugene.iot.backend.services.ProtocolService
+import java.time.ZonedDateTime
+import java.time.ZoneOffset
+import java.time.format.DateTimeFormatter
 
 fun Route.protocolRoutes() {
-    route(AppConfig.apiPrefix+"/protocol") {
+
+    route(AppConfig.apiPrefix + "/protocol") {
+
         get("/health") {
-            call.respond(HttpStatusCode.OK, mapOf("status" to "ok"))
+            call.respond("ok")
-        }
-
-        post("/message") {
-            val json = Json {
-                ignoreUnknownKeys = false
-            }
-
-            val protocolService = ProtocolService(json)
-
-            val msg = call.receive<MessageDto>()
-
-            protocolService.handleMessage(msg)
-
-            call.respond(HttpStatusCode.Accepted)
         }
     }
+
+
 }

backend/src/main/kotlin/org/pavloveugene/iot/backend/routes/ProtocolWebSocket.kt

@@ -4,20 +4,12 @@ import MessageDto
 import io.ktor.server.websocket.*
 import io.ktor.server.routing.*
 import io.ktor.websocket.*
-import io.ktor.server.application.*
-import io.ktor.server.response.*
 import io.ktor.utils.io.CancellationException
 import kotlinx.serialization.json.Json
-import kotlinx.serialization.json.JsonObject
-import kotlinx.serialization.decodeFromString
-import kotlinx.serialization.encodeToString
-import kotlinx.serialization.json.encodeToJsonElement
 import org.pavloveugene.iot.backend.config.AppConfig
-import org.pavloveugene.iot.backend.dto.ProtocolMessage
+import org.pavloveugene.iot.backend.services.DeviceConnections
-import org.pavloveugene.iot.backend.dto.TelemetryDto
 import org.pavloveugene.iot.backend.services.ProtocolService
 import java.io.IOException
-import java.time.Duration
 
 fun Route.protocolWebSocket() {
     val json = Json {
@@ -27,8 +19,11 @@ fun Route.protocolWebSocket() {
     val protocolService = ProtocolService(json)
 
     webSocket(AppConfig.wsPath) {
+
         println("WS connected")
 
+        var devId: UInt? = null
+
         try {
             for (frame in incoming) {
                 if (frame is Frame.Text) {
@@ -43,7 +38,8 @@ fun Route.protocolWebSocket() {
                     }
 
                     try {
-                        protocolService.handleMessage(msg)
+                        devId = msg.d
+                        protocolService.handleMessage(msg, this)
                     } catch (e: Exception) {
                         println("WS handler error: ${e.message}")
                     }
@@ -56,7 +52,10 @@ fun Route.protocolWebSocket() {
         } catch (e: Exception) {
             println("WS error: ${e.message}")
         } finally {
-            println("WS disconnected")
+            devId?.let {
+                DeviceConnections.unregister(devId)
+                println("WS disconnected: $it")
+            }
         }
     }
 }

backend/src/main/kotlin/org/pavloveugene/iot/backend/routes/Routing.kt

@@ -1,31 +0,0 @@
-package org.pavloveugene.iot.backend.routes
-
-import io.ktor.http.HttpStatusCode
-import io.ktor.server.application.*
-import io.ktor.server.response.*
-import io.ktor.server.routing.*
-import org.pavloveugene.iot.backend.db.Database
-
-fun Application.configureRouting() {
-    routing {
-        get("/api/v1/health") {
-            try {
-                Database.dataSource.connection.use { conn ->
-                    conn.createStatement().execute("SELECT 1")
-                }
-                call.respondText("OK")
-            } catch (e: Exception) {
-                call.respond(HttpStatusCode.InternalServerError, "DB ERROR")
-            }
-        }
-        get("/api/v1/ready") {
-            // например:
-            // - миграции применены
-            // - WS сервис готов
-            call.respondText("READY")
-        }
-        get("/live") {
-            call.respondText("ALIVE")
-        }
-    }
-}

backend/src/main/kotlin/org/pavloveugene/iot/backend/routes/WsRoutes.kt

@@ -1,4 +0,0 @@
-package org.pavloveugene.iot.backend.routes
-
-class WsRoutes {
-}

backend/src/main/kotlin/org/pavloveugene/iot/backend/services/CleanupService.kt

@@ -0,0 +1,53 @@
+package org.pavloveugene.iot.backend.services
+
+import org.pavloveugene.iot.backend.db.Database
+import java.sql.SQLException
+
+fun executeCleanup() {
+    val ds = Database.dataSource
+    val start = System.currentTimeMillis()
+    val cutoff = start / 1000 - 60 * 60 * 24 * 2
+
+    println("Begin cleanup")
+
+    ds.connection.use { conn ->
+        conn.autoCommit = false
+
+        try {
+            var total = 0
+
+            do {
+                val deleted = conn.prepareStatement("""
+                    delete t
+                    from telemetry t
+                    join (
+                        select id
+                        from telemetry
+                        where ts < ? and processed = true
+                        limit 1000
+                    ) p on p.id = t.id
+                """.trimIndent()).use { ps ->
+                    ps.setLong(1, cutoff)
+                    ps.executeUpdate()
+                }
+
+                total += deleted
+
+                if (deleted > 0) {
+                    println("Deleted $deleted rows (total $total)")
+                }
+
+                conn.commit()
+
+            } while (deleted > 0)
+
+        } catch (e: SQLException) {
+            conn.rollback()
+            throw RuntimeException("Error during cleanup", e)
+        } finally {
+            conn.autoCommit = true
+        }
+    }
+
+    println("Cleanup complete in ${System.currentTimeMillis() - start} ms")
+}

backend/src/main/kotlin/org/pavloveugene/iot/backend/services/DeviceConnection.kt

@@ -0,0 +1,8 @@
+package org.pavloveugene.iot.backend.services
+
+import io.ktor.websocket.WebSocketSession
+
+data class DeviceConnection(
+    val session: WebSocketSession,
+    var lastSeen: Long
+)

backend/src/main/kotlin/org/pavloveugene/iot/backend/services/DeviceConnections.kt

@@ -0,0 +1,18 @@
+package org.pavloveugene.iot.backend.services
+
+import io.ktor.websocket.WebSocketSession
+import java.util.concurrent.ConcurrentHashMap
+
+object DeviceConnections {
+    private val map = ConcurrentHashMap<UInt, DeviceConnection>()
+
+    fun register(deviceId: UInt, connection: DeviceConnection) {
+        map[deviceId] = connection
+    }
+
+    fun unregister(deviceId: UInt) {
+        map.remove(deviceId)
+    }
+
+    fun get(deviceId: UInt): DeviceConnection? = map[deviceId]
+}

backend/src/main/kotlin/org/pavloveugene/iot/backend/services/KtorServer.kt

@@ -0,0 +1,54 @@
+package org.pavloveugene.iot.backend.services
+
+import io.ktor.serialization.kotlinx.json.json
+import io.ktor.server.application.install
+import io.ktor.server.engine.embeddedServer
+import io.ktor.server.netty.Netty
+import io.ktor.server.plugins.contentnegotiation.ContentNegotiation
+import io.ktor.server.routing.routing
+import io.ktor.server.websocket.WebSockets
+import io.ktor.server.websocket.pingPeriod
+import io.ktor.server.websocket.timeout
+import io.netty.handler.codec.compression.StandardCompressionOptions.gzip
+import org.pavloveugene.iot.backend.config.AppConfig
+import org.pavloveugene.iot.backend.routes.protocolRoutes
+import org.pavloveugene.iot.backend.routes.protocolWebSocket
+import java.time.Duration
+import io.ktor.server.plugins.compression.*
+import org.pavloveugene.iot.backend.routes.firmwareRouting
+
+fun startKtorServer() {
+    val server = embeddedServer(
+        Netty,
+        port = AppConfig.serverPort,
+        host = AppConfig.serverHost,
+    ) {
+        install(ContentNegotiation) {
+            json()
+        }
+
+        install(WebSockets) {
+            pingPeriod = Duration.ofSeconds(15)
+            timeout = Duration.ofSeconds(30)
+            maxFrameSize = Long.MAX_VALUE
+            masking = false
+        }
+
+        routing {
+            protocolRoutes()
+            protocolWebSocket()
+            firmwareRouting()
+        }
+    }
+
+    Runtime.getRuntime().addShutdownHook(Thread {
+        println("Shutting down...")
+        try {
+            server.stop(1000, 2000)
+        } catch (e: Exception) {
+            println("Shutdown error: ${e.message}")
+        }
+    })
+
+    server.start(wait = true)
+}

backend/src/main/kotlin/org/pavloveugene/iot/backend/services/NormalizeService.kt

@@ -0,0 +1,187 @@
+package org.pavloveugene.iot.backend.services
+
+import org.pavloveugene.iot.backend.db.Database
+
+fun runNormalizeLoop() {
+    var total = 0
+    val start = System.currentTimeMillis()
+    verifyData()
+    do {
+        val count = normalizeBatch()
+        total += count
+        println("Processed batch: $count")
+    } while (count > 0)
+
+    println("Done. Total processed: $total in ${System.currentTimeMillis() - start} ms")
+
+}
+
+fun normalizeBatch(): Int {
+    val ds = Database.dataSource
+
+    var count = 0
+
+    ds.connection.use { conn ->
+
+        conn.autoCommit = false
+
+        try {
+
+            conn.createStatement().use { stmt ->
+                stmt.executeUpdate(
+                    """
+                    create temporary table pack as
+                    select t.id
+                    from telemetry t
+                    where t.processed=false and t.defective=false
+                    order by t.id
+                    limit 1000
+                    """.trimIndent()
+                )
+
+                stmt.executeQuery("select count(0) from pack").use { rs ->
+                    rs.next()
+                    count = rs.getInt(1)
+                }
+
+                if (count > 0) {
+
+                    stmt.executeUpdate(
+                        """
+                        INSERT INTO telemetry_data (device_id, ts, metric, source, value, unit)
+                        SELECT t.device_id
+                        , t.ts * 1000 + CAST(JSON_UNQUOTE(JSON_EXTRACT(t.payload, CONCAT('$[', seq.i, '][0]'))) AS double)
+                        , t.metric
+                        , t.source
+                        , CAST(JSON_UNQUOTE(JSON_EXTRACT(t.payload, CONCAT('$[', seq.i, '][1]'))) AS DOUBLE) * coalesce(u.multiplier, 1)
+                        , coalesce(u.target_unit, t.unit)
+                        FROM pack p
+                        join telemetry t on t.id = p.id 
+                        JOIN ( SELECT 0 AS i 
+                        UNION ALL SELECT 1 
+                        UNION ALL SELECT 2 
+                        UNION ALL SELECT 3 
+                        UNION ALL SELECT 4 
+                        UNION ALL SELECT 5 
+                        UNION ALL SELECT 6
+                        UNION ALL SELECT 7 
+                        UNION ALL SELECT 8 
+                        UNION ALL SELECT 9 
+                        UNION ALL SELECT 10 
+                        UNION ALL SELECT 11 
+                        UNION ALL SELECT 12 
+                        UNION ALL SELECT 13 
+                        UNION ALL SELECT 14 
+                        UNION ALL SELECT 15 
+                        UNION ALL SELECT 16 
+                        UNION ALL SELECT 17 
+                        UNION ALL SELECT 18 
+                        UNION ALL SELECT 19 
+                        UNION ALL SELECT 20 
+                        UNION ALL SELECT 21 
+                        UNION ALL SELECT 22 
+                        UNION ALL SELECT 23 
+                        UNION ALL SELECT 24 
+                        UNION ALL SELECT 25 
+                        UNION ALL SELECT 26 
+                        UNION ALL SELECT 27 
+                        UNION ALL SELECT 28 
+                        UNION ALL SELECT 29 
+                        UNION ALL SELECT 30 
+                        UNION ALL SELECT 31 
+                        ) AS seq ON seq.i < JSON_LENGTH(t.payload)
+                        left join units u on u.unit = t.unit
+                        WHERE JSON_EXTRACT(t.payload, CONCAT('$[', seq.i, ']')) IS NOT NULL
+                """.trimIndent()
+                    )
+
+                    stmt.executeUpdate(
+                        """
+                        update 
+                        telemetry t 
+                        join pack p on t.id = p.id
+                        set t.processed = true
+                        """
+                    )
+                }
+
+                stmt.executeUpdate("drop temporary table pack")
+
+                conn.commit()
+            }
+        } catch (e: Exception) {
+            conn.rollback()
+            throw RuntimeException("Error during normalize", e)
+        } finally {
+            conn.autoCommit = true
+        }
+    }
+
+    return count
+}
+
+fun verifyData(): Boolean {
+    val ds = Database.dataSource
+    var ret = true;
+
+    println("Executing verification")
+
+    ds.connection.use { conn ->
+
+        conn.autoCommit = false
+
+        try {
+            conn.createStatement().use { stmt ->
+                stmt.executeUpdate(
+                    """
+                create temporary table err as
+                select t.id
+                , case
+                  when t.unit = '' then 'No unit'
+                  else 'Invalid unit'
+                end reason
+                from telemetry t
+                where t.processed=false and t.defective=false
+                  and (t.unit = '' or (
+                    t.unit not in (select unit from units)
+                    and t.unit not in (select target_unit from units)
+                    and t.unit not in ('v', 'a', 'm', 'g', 'kg', 'raw')
+                  )) 
+            """.trimIndent()
+                )
+
+                stmt.executeQuery("select count(0) from err").use { rs ->
+                    rs.next()
+                    val count = rs.getInt(1)
+                    ret = count == 0
+                    if (ret) {
+                        println("All ok!")
+                    } else {
+                        println("$count errors detected")
+                    }
+                }
+
+                stmt.executeUpdate(
+                    """
+                update telemetry t 
+                join err e on e.id=t.id
+                set t.defective=true, t.defective_reason=e.reason
+            """.trimIndent()
+                )
+
+                stmt.executeUpdate("drop temporary table err")
+            }
+
+            conn.commit()
+
+        } catch (e: Exception) {
+            conn.rollback()
+        } finally {
+            conn.autoCommit = true
+        }
+    }
+
+    println("Verification complete")
+
+    return ret
+}

backend/src/main/kotlin/org/pavloveugene/iot/backend/services/ProtocolService.kt

@@ -1,17 +1,20 @@
 package org.pavloveugene.iot.backend.services
 
 import MessageDto
+import io.ktor.server.websocket.WebSocketServerSession
+import io.ktor.websocket.WebSocketSession
 import kotlinx.serialization.builtins.ListSerializer
 import kotlinx.serialization.builtins.serializer
 import kotlinx.serialization.json.Json
 import org.pavloveugene.iot.backend.db.Database
+import org.pavloveugene.iot.backend.dto.EventDto
 import org.pavloveugene.iot.backend.dto.TelemetryDto
 
 class ProtocolService(
     private val json: Json
 ) {
 
-    fun handleMessage(msg: MessageDto) {
+    fun handleMessage(msg: MessageDto, session: WebSocketSession) {
         when (msg.t) {
             MessageType.TELEMETRY -> {
                 handleTelemetry(msg)
@@ -20,6 +23,7 @@ class ProtocolService(
             MessageType.EVENT -> {
                 println("=== EVENT ===")
                 println(msg.p)
+                handleEvent(msg, session)
             }
 
             MessageType.COMMAND -> {
@@ -29,6 +33,27 @@ class ProtocolService(
         }
     }
 
+    private fun handleEvent(msg: MessageDto, session: WebSocketSession) {
+        val payload = json.decodeFromJsonElement(EventDto.serializer(), msg.p)
+        when (payload.type) {
+            "HB" -> {
+                println("=== HB devId = ${msg.d} ===")
+
+                val connection = DeviceConnections.get(msg.d)
+                if (connection == null) {
+                    DeviceConnections.register(
+                        msg.d, DeviceConnection(
+                            session = session,
+                            lastSeen = System.currentTimeMillis()
+                        )
+                    )
+                } else {
+                    connection.lastSeen = System.currentTimeMillis()
+                }
+            }
+        }
+    }
+
     fun handleTelemetry(msg: MessageDto) {
         val ds = Database.dataSource
 
@@ -37,19 +62,23 @@ class ProtocolService(
 
             try {
                 // ensure device
-                conn.prepareStatement("""
+                conn.prepareStatement(
+                    """
                 INSERT INTO devices(id)
                 VALUES (?)
                 ON DUPLICATE KEY UPDATE id = id
-            """).use {
+            """
+                ).use {
                     it.setLong(1, msg.d.toLong())
                     it.executeUpdate()
                 }
 
                 // check enabled
-                val isEnabled = conn.prepareStatement("""
+                val isEnabled = conn.prepareStatement(
+                    """
                 SELECT is_enabled FROM devices WHERE id = ?
-            """).use {
+            """
+                ).use {
                     it.setLong(1, msg.d.toLong())
                     val rs = it.executeQuery()
                     if (rs.next()) rs.getBoolean(1) else false
@@ -70,18 +99,21 @@ class ProtocolService(
                 println("values=${payload.v}")
 
                 // insert telemetry
-                conn.prepareStatement("""
+                conn.prepareStatement(
+                    """
                 INSERT INTO telemetry(
                     device_id, ts, metric, source, unit, payload
                 ) VALUES (?, ?, ?, ?, ?, ?)
-            """).use {
+            """
+                ).use {
                     it.setLong(1, msg.d.toLong())
                     it.setLong(2, msg.ts)
                     it.setString(3, payload.m)
                     it.setString(4, payload.s)
                     it.setString(5, payload.u)
 
-                    val payloadJson = json.encodeToString( ListSerializer(ListSerializer(Double.serializer())),payload.v)
+                    val payloadJson =
+                        json.encodeToString(ListSerializer(ListSerializer(Double.serializer())), payload.v)
                     it.setString(6, payloadJson)
 
                     it.executeUpdate()

contract/ingest/command.schema.json

@@ -0,0 +1,29 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "$id": "contract/ingest/command.schema.json",
+  "type": "object",
+  "required": ["t"],
+  "additionalProperties": false,
+
+  "properties": {
+    "t": {
+      "type": "string",
+      "enum": ["fw"]
+    }
+  },
+
+  "allOf": [
+    {
+      "if": {
+        "properties": { "t": { "const": "fw" } }
+      },
+      "then": {
+        "required": ["u", "s"],
+        "properties": {
+          "u": { "type": "string", "format": "uri" },
+          "s": { "type": "string", "pattern": "^[a-f0-9]{64}$" }
+        }
+      }
+    }
+  ]
+}

contract/ingest/event.schema.json

@@ -1,38 +1,11 @@
 {
-  "$schema": "http://json-schema.org/draft-07/schema#",
+  "type": "object",
-  "$id": "contract/ingest/event.schema.json",
+  "required": ["type"],
-  "allOf": [
+  "properties": {
-    { "$ref": "contract/ingest/common.schema.json" },
+    "type": {
-    {
+      "type": "string",
-      "type": "object",
+      "enum": ["hb"]
-      "properties": {
-        "type": {
-          "const": "event"
-        },
-        "payload": {
-          "type": "object",
-          "required": ["name"],
-          "additionalProperties": false,
-          "properties": {
-            "name": {
-              "type": "string",
-              "minLength": 1,
-              "description": "Event identifier, e.g. device.overheat"
-            },
-            "severity": {
-              "type": "string",
-              "enum": ["debug", "info", "warn", "error", "fatal"]
-            },
-            "message": {
-              "type": "string"
-            },
-            "data": {
-              "type": "object",
-              "additionalProperties": true
-            }
-          }
-        }
-      }
     }
-  ]
+  },
+  "additionalProperties": false
 }

db/migrations/V2__telemetry_data.sql

@@ -0,0 +1,20 @@
+CREATE TABLE telemetry_data (
+    id BIGINT AUTO_INCREMENT PRIMARY KEY,
+
+    device_id BIGINT NOT NULL,
+    ts BIGINT NOT NULL,
+
+    metric VARCHAR(32) NOT NULL,
+    source VARCHAR(64) NOT NULL,
+
+    value DOUBLE NOT NULL,
+
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+
+    INDEX idx_device_metric_ts (device_id, metric, ts),
+    INDEX idx_ts (ts),
+
+    FOREIGN KEY (device_id) REFERENCES devices(id)
+);
+
+CREATE INDEX idx_processed ON telemetry(processed);

db/migrations/V3__telemetry_processed_index.sql

@@ -0,0 +1,2 @@
+CREATE INDEX idx_telemetry_processed_id
+ON telemetry (processed, id);

db/migrations/V4__telemetry_units.sql

@@ -0,0 +1,16 @@
+alter TABLE telemetry
+add defective boolean default false,
+add defective_reason varchar(64);
+
+alter TABLE telemetry_data ADD 
+unit varchar (16);
+
+create table units (
+    unit varchar(16) not null,
+    target_unit varchar(16) not null,
+    multiplier double not null,
+    primary key (unit)
+);
+
+insert into units (unit, target_unit, multiplier) 
+values ('c_x100', 'c', 0.01);

db/migrations/V5__firmware_updates.sql

@@ -0,0 +1,24 @@
+create table firmware (
+    id int not null auto_increment,
+    device_id bigint not null,
+    version int not null,
+    path varchar(4096) not null,
+    sha256 char(64),
+    size int,
+    uploaded_at timestamp not null default current_timestamp,
+    primary key (id),
+    foreign key (device_id) references devices(id),
+
+    unique(device_id, version)
+);
+
+create table firmware_updates (
+    id int not null auto_increment,
+    firmware_id int not null,
+    status varchar(32) not null, -- pending / sent / applied / failed
+    requested_at timestamp not null default current_timestamp,
+    applied_at timestamp null,
+
+    primary key (id),
+    foreign key (firmware_id) references firmware(id)
+);

esp32/CMakeLists.txt

@@ -2,6 +2,8 @@
 # CMakeLists in this exact order for cmake to work correctly
 cmake_minimum_required(VERSION 3.22)
 
+file(READ "${CMAKE_SOURCE_DIR}/version.txt" PROJECT_VER)
+string(STRIP "${PROJECT_VER}" PROJECT_VER)
+
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(esp32)
-

esp32/dependencies.lock

@@ -9,13 +9,24 @@ dependencies:
       registry_url: https://components.espressif.com/
       type: service
     version: 1.6.1
+  espressif/onewire_bus:
+    component_hash: d709015ba466095259228521cf1bad9c0cdaaa42a92ea5d9c88ec6c28ae89e9b
+    dependencies:
+    - name: idf
+      require: private
+      version: '>=5.0'
+    source:
+      registry_url: https://components.espressif.com/
+      type: service
+    version: 1.1.0
   idf:
     source:
       type: idf
     version: 6.0.0
 direct_dependencies:
 - espressif/esp_websocket_client
+- espressif/onewire_bus
 - idf
-manifest_hash: 68800db522a823ce0f8709ffb9c800760892c2d5889621f1cd9804dc45ae76f9
+manifest_hash: 13e7ecd84ccc03ee20f4d74c327e5e03dc83702693f2188053e8b384ceb1adac
 target: esp32
 version: 3.0.0

esp32/main/CMakeLists.txt

@@ -1,8 +1,30 @@
 idf_component_register(
-        SRCS "main.cpp" "protocol.cpp" "wifi_manager.cpp" "system_init.cpp" "time_sync.cpp" "adc_reader.cpp" "ringbuf.cpp" "sampler_task.cpp" "sender_task.cpp"
+        SRCS "main.cpp"
+        "protocol.cpp"
+        "wifi_manager.cpp"
+        "system_init.cpp"
+        "time_sync.cpp"
+        "adc_reader.cpp"
+        "ringbuf.cpp"
+        "sampler_task.cpp"
+        "sender_task.cpp"
         "ws.cpp"
+        "gpio_init.cpp"
+        "ds18b20.cpp"
+        "heartbeat_task.cpp"
+        "fw_command.cpp"
+        "json_utils.cpp"
         INCLUDE_DIRS "."
-        REQUIRES nvs_flash esp_wifi esp_netif freertos log cjson esp_timer esp_adc esp_websocket_client
+        REQUIRES nvs_flash
+        esp_wifi
+        esp_netif
+        freertos
+        log
+        esp_timer
+        esp_adc
+        esp_websocket_client
+        driver
+        esp_driver_gpio
 )
 # добавляем кастомный Kconfig
 set(COMPONENT_KCONFIG "Kconfig")

esp32/main/ds18b20.cpp

@@ -0,0 +1,85 @@
+#include "ds18b20.h"
+
+extern "C" {
+#include "onewire_bus.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_log.h"
+}
+
+static const char *TAG = "ds18b20";
+
+static onewire_bus_handle_t bus;
+
+uint8_t ds_crc8(const uint8_t *data, int len)
+{
+    uint8_t crc = 0;
+    for (int i = 0; i < len; i++) {
+        uint8_t inbyte = data[i];
+        for (int j = 0; j < 8; j++) {
+            uint8_t mix = (crc ^ inbyte) & 0x01;
+            crc >>= 1;
+            if (mix) crc ^= 0x8C;
+            inbyte >>= 1;
+        }
+    }
+    return crc;
+}
+
+void ds18b20_init(gpio_num_t pin)
+{
+    onewire_bus_config_t bus_config = {};
+    bus_config.bus_gpio_num = pin;
+
+    onewire_bus_rmt_config_t rmt_config = {};
+    rmt_config.max_rx_bytes = 10;
+
+    ESP_ERROR_CHECK(onewire_new_bus_rmt(&bus_config, &rmt_config, &bus));
+
+    ESP_LOGI(TAG, "OneWire bus initialized");
+}
+
+float ds18b20_read()
+{
+    uint8_t data[9];
+    uint8_t buf[4] = {0x4E, 0, 0, 0x3F}; // 10-bit (0x3F)
+    // reset
+    ESP_ERROR_CHECK(onewire_bus_reset(bus));
+
+    // SKIP ROM (один датчик)
+    uint8_t cmd = 0xCC;
+    ESP_ERROR_CHECK(onewire_bus_write_bytes(bus, &cmd, 1));
+    //ESP_ERROR_CHECK(onewire_bus_write_bytes(bus, buf, 4));
+    // CONVERT T
+    cmd = 0x44;
+    ESP_ERROR_CHECK(onewire_bus_write_bytes(bus, &cmd, 1));
+
+    vTaskDelay(pdMS_TO_TICKS(750));
+
+    // reset снова
+    ESP_ERROR_CHECK(onewire_bus_reset(bus));
+
+    // SKIP ROM
+    cmd = 0xCC;
+    ESP_ERROR_CHECK(onewire_bus_write_bytes(bus, &cmd, 1));
+
+    // READ SCRATCHPAD
+    cmd = 0xBE;
+    ESP_ERROR_CHECK(onewire_bus_write_bytes(bus, &cmd, 1));
+
+    ESP_ERROR_CHECK(onewire_bus_read_bytes(bus, data, 9));
+
+    ESP_LOGI(TAG,
+            "RAW: %02X %02X %02X %02X %02X %02X %02X %02X | CRC %02X",
+            data[0], data[1], data[2], data[3],
+            data[4], data[5], data[6], data[7], data[8]);
+
+    uint8_t crc = ds_crc8(data, 8);
+    if (crc != data[8]) {
+        ESP_LOGW(TAG, "CRC error");
+    }
+
+    int16_t raw = (data[1] << 8) | data[0];
+    return raw / 16.0f;
+}
+

esp32/main/ds18b20.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include "driver/gpio.h"
+
+void ds18b20_init(gpio_num_t pin);
+float ds18b20_read();

esp32/main/fw_command.cpp

@@ -0,0 +1,18 @@
+//
+// Created by eugene on 22.04.2026.
+//
+
+#include "fw_command.h"
+#include "json_utils.h"
+#include <cstring>
+
+bool parse_fw_command(const char *msg, fw_cmd_t *out) {
+    if (!strstr(msg, "\"t\":\"c\"")) return false;
+    if (!strstr(msg, "\"t\":\"fw\"")) return false;
+
+    if (!json_get_string(msg, "\"u\"", out->url, sizeof(out->url))) return false;
+    if (!json_get_string(msg, "\"s\"", out->sha256, sizeof(out->sha256))) return false;
+
+    out->is_fw = true;
+    return true;
+}

esp32/main/fw_command.h

@@ -0,0 +1,9 @@
+#pragma once
+
+typedef struct {
+    bool is_fw;
+    char url[256];
+    char sha256[65]; // 64 + \0
+} fw_cmd_t;
+
+bool parse_fw_command(const char *msg, fw_cmd_t *out);

esp32/main/gpio_init.cpp

@@ -0,0 +1,20 @@
+#include "gpio_init.h"
+#include "hal/gpio_types.h"
+#include "driver/gpio.h"
+
+#define PIN_OUT GPIO_NUM_22
+
+void init_gpio()
+{
+     gpio_config_t io_conf = {
+         .pin_bit_mask = (1ULL << PIN_OUT),
+         .mode = GPIO_MODE_OUTPUT,
+         .pull_up_en = GPIO_PULLUP_DISABLE,
+         .pull_down_en = GPIO_PULLDOWN_DISABLE,
+         .intr_type = GPIO_INTR_DISABLE
+     };
+
+     gpio_config(&io_conf);
+
+     gpio_set_level(PIN_OUT, 1); // HIGH ≈ 3.3В
+}

esp32/main/gpio_init.h

@@ -0,0 +1,3 @@
+#pragma once
+
+void init_gpio();

esp32/main/heartbeat_task.cpp

@@ -0,0 +1,31 @@
+#include "heartbeat_task.h"
+
+extern "C" {
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_log.h"
+#include "protocol.h"
+#include <time.h>
+}
+
+static const char *TAG = "heartbeat";
+
+static void heartbeat_task(void *arg)
+{
+    while (1) {
+        if (protocol_is_connected()) {
+
+            time_t now;
+            time(&now);
+
+            protocol_send_event_hb((uint32_t)now);
+        }
+
+        vTaskDelay(pdMS_TO_TICKS(10000)); // 10 сек
+    }
+}
+
+void heartbeat_task_start()
+{
+    xTaskCreate(heartbeat_task, "heartbeat", 4096, NULL, 5, NULL);
+}

esp32/main/heartbeat_task.h

@@ -0,0 +1,3 @@
+#pragma once
+
+void heartbeat_task_start(void);

esp32/main/idf_component.yml

@@ -15,3 +15,4 @@ dependencies:
   #   # All dependencies of `main` are public by default.
   #   public: true
   espressif/esp_websocket_client: '*'
+  espressif/onewire_bus: '*'

esp32/main/json_utils.cpp

@@ -0,0 +1,30 @@
+#include <cstring>
+#include <cstddef>
+#include "json_utils.h"
+
+bool json_get_string(const char *json, const char *key, char *out, size_t out_size) {
+    const char *k = strstr(json, key);
+    if (!k) return false;
+
+    const char *start = strchr(k, ':');
+    if (!start) return false;
+
+    start++;
+
+    // найти начало строки (первую кавычку)
+    while (*start && *start != '\"') start++;
+    if (!*start) return false;
+
+    start++; // после "
+
+    const char *end = strchr(start, '\"');
+    if (!end) return false;
+
+    size_t len = end - start;
+    if (len >= out_size) return false;
+
+    memcpy(out, start, len);
+    out[len] = '\0';
+
+    return true;
+}

esp32/main/json_utils.h

@@ -0,0 +1,4 @@
+#pragma once
+#include <cstddef>
+
+bool json_get_string(const char *json, const char *key, char *out, size_t out_size);

esp32/main/main.cpp

@@ -1,5 +1,6 @@
 #include "esp_log.h"
 #include "system_init.h"
+#include "heartbeat_task.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/projdefs.h"
 #include "freertos/task.h"
@@ -13,8 +14,10 @@ extern "C" void app_main(void)
 {
     system_init();
 
-    sampler_task_start();
+    //sampler_task_start();
-    sender_task_start();
+    //sender_task_start();
+
+    heartbeat_task_start();
 
     system_finalize();
 }

esp32/main/protocol.cpp

@@ -1,10 +1,15 @@
 #include "protocol.h"
+#include "ws.h"
 #include <stdio.h>
 #include <stdarg.h>
+#include <inttypes.h>
 
 #define PROTOCOL_VERSION 1
 
-static inline int append(char* buf, size_t size, int pos, const char* fmt, ...) {
+static uint32_t msg_id = 1;
+
+static inline int append(char* buf, size_t size, int pos, const char* fmt, ...)
+{
     if ((size_t)pos >= size) return -1;
 
     va_list args;
@@ -12,7 +17,8 @@ static inline int append(char* buf, size_t size, int pos, const char* fmt, ...)
     int written = vsnprintf(buf + pos, size - pos, fmt, args);
     va_end(args);
 
-    if (written < 0 || (size_t)(pos + written) >= size) {
+    if (written < 0 || (size_t)(pos + written) >= size)
+    {
         return -1;
     }
 
@@ -22,7 +28,6 @@ static inline int append(char* buf, size_t size, int pos, const char* fmt, ...)
 int build_telemetry(
     char* buf,
     size_t buf_size,
-    uint32_t msg_id,
     int64_t ts,
     uint32_t device_id,
     const char* metric,
@@ -30,34 +35,36 @@ int build_telemetry(
     const char* unit,
     const int* values,
     size_t count
-) {
+)
+{
     int pos = 0;
 
     // --- header ---
     pos = append(buf, buf_size, pos,
-        "{\"v\":1,\"t\":\"t\",\"id\":%lu,\"ts\":%lld,\"d\":%lu,\"p\":{",
+                 "{\"v\":1,\"t\":\"t\",\"id\":%lu,\"ts\":%lld,\"d\":%lu,\"p\":{",
-        (unsigned long)msg_id,
+                 (unsigned long)protocol_next_id(),
-        (long long)ts,
+                 (long long)ts,
-        (unsigned long)device_id
+                 (unsigned long)device_id
     );
     if (pos < 0) return -1;
 
     // --- payload meta ---
     pos = append(buf, buf_size, pos,
-        "\"m\":\"%s\",\"s\":\"%s\",\"u\":\"%s\",\"v\":[",
+                 "\"m\":\"%s\",\"s\":\"%s\",\"u\":\"%s\",\"v\":[",
-        metric,
+                 metric,
-        source,
+                 source,
-        unit
+                 unit
     );
     if (pos < 0) return -1;
 
     // --- values ---
-    for (size_t i = 0; i < count; i++) {
+    for (size_t i = 0; i < count ; i ++)
+    {
         pos = append(buf, buf_size, pos,
-            "[%u,%d]%s",
+                     "[%u,%d]%s",
-            (unsigned)i,              // delta time (пока просто индекс)
+                     values[i*2 + 0], // delta time
-            values[i],
+                     values[i*2 + 1],
-            (i < count - 1) ? "," : ""
+                     (i < count - 1) ? "," : ""
         );
         if (pos < 0) return -1;
     }
@@ -71,7 +78,7 @@ int build_telemetry(
 
 __attribute__((deprecated))
 // --- TELEMETRY (single measurement) ---
-    int build_telemetry_single(
+int build_telemetry_single(
     char* buf,
     size_t buf_size,
     const char* id,
@@ -82,40 +89,44 @@ __attribute__((deprecated))
     const char* unit,
     const char* source,
     int64_t m_ts_ms
-) {
+)
+{
     int pos = 0;
 
     // header
     pos = append(buf, buf_size, pos,
-        "{\"v\":%d,\"id\":\"%s\",\"type\":\"telemetry\",\"ts\":%lld,"
+                 "{\"v\":%d,\"id\":\"%s\",\"type\":\"telemetry\",\"ts\":%lld,"
-        "\"deviceId\":\"%s\",\"payload\":{\"measurements\":[",
+                 "\"deviceId\":\"%s\",\"payload\":{\"measurements\":[",
-        PROTOCOL_VERSION,
+                 PROTOCOL_VERSION,
-        id,
+                 id,
-        (long long)ts_ms,
+                 (long long)ts_ms,
-        device_id
+                 device_id
     );
     if (pos < 0) return -1;
 
     // measurement start
     pos = append(buf, buf_size, pos,
-        "{\"metric\":\"%s\",\"value\":%.3f",
+                 "{\"metric\":\"%s\",\"value\":%.3f",
-        metric,
+                 metric,
-        value
+                 value
     );
     if (pos < 0) return -1;
 
     // optional
-    if (unit) {
+    if (unit)
+    {
         pos = append(buf, buf_size, pos, ",\"unit\":\"%s\"", unit);
         if (pos < 0) return -1;
     }
 
-    if (source) {
+    if (source)
+    {
         pos = append(buf, buf_size, pos, ",\"source\":\"%s\"", source);
         if (pos < 0) return -1;
     }
 
-    if (m_ts_ms > 0) {
+    if (m_ts_ms > 0)
+    {
         pos = append(buf, buf_size, pos, ",\"ts\":%lld", (long long)m_ts_ms);
         if (pos < 0) return -1;
     }
@@ -138,17 +149,18 @@ int build_event(
     const char* name,
     const char* severity,
     const char* message
-) {
+)
+{
     int pos = 0;
 
     // header
     pos = append(buf, buf_size, pos,
-        "{\"v\":%d,\"id\":\"%s\",\"type\":\"event\",\"ts\":%lld,"
+                 "{\"v\":%d,\"id\":\"%s\",\"type\":\"event\",\"ts\":%lld,"
-        "\"deviceId\":\"%s\",\"payload\":{",
+                 "\"deviceId\":\"%s\",\"payload\":{",
-        PROTOCOL_VERSION,
+                 PROTOCOL_VERSION,
-        id,
+                 id,
-        (long long)ts_ms,
+                 (long long)ts_ms,
-        device_id
+                 device_id
     );
     if (pos < 0) return -1;
 
@@ -157,12 +169,14 @@ int build_event(
     if (pos < 0) return -1;
 
     // optional
-    if (severity) {
+    if (severity)
+    {
         pos = append(buf, buf_size, pos, ",\"severity\":\"%s\"", severity);
         if (pos < 0) return -1;
     }
 
-    if (message) {
+    if (message)
+    {
         pos = append(buf, buf_size, pos, ",\"message\":\"%s\"", message);
         if (pos < 0) return -1;
     }
@@ -173,3 +187,29 @@ int build_event(
 
     return pos;
 }
+
+uint32_t protocol_next_id()
+{
+    return msg_id++;
+};
+
+void protocol_send_event_hb(int64_t ts)
+{
+    // формируешь JSON строго по контракту
+
+    // пример:
+    char buf[128];
+
+    uint32_t id = protocol_next_id();
+
+    snprintf(buf, sizeof(buf),
+        "{\"v\":1,\"id\":%" PRIu32 ",\"t\":\"e\",\"ts\":%" PRIu64 ",\"d\":%u,\"p\":{\"type\":\"hb\"}}",
+        id, ts, CONFIG_DEVICE_ID);
+
+    ws_send(buf);
+}
+
+bool protocol_is_connected()
+{
+    return ws_is_connected();
+}

esp32/main/protocol.h

@@ -2,6 +2,8 @@
 
 #include <stdint.h>
 #include <stddef.h>
+#include "ringbuf.h"
+
 
 #ifdef __cplusplus
 extern "C" {
@@ -10,7 +12,6 @@ extern "C" {
 int build_telemetry(
     char* buf,
     size_t buf_size,
-    uint32_t msg_id,
     int64_t ts,
     uint32_t device_id,
     const char* metric,
@@ -44,6 +45,12 @@ int build_event(
     const char* message   // optional
 );
 
+uint32_t protocol_next_id();
+
+void protocol_send_event_hb(int64_t ts);
+
+bool protocol_is_connected();
+
 #ifdef __cplusplus
 }
 #endif

esp32/main/ringbuf.cpp

@@ -3,16 +3,18 @@
 void ringbuf_init(ringbuf_t *rb) {
     rb->head = 0;
     for (int i = 0; i < RINGBUF_SIZE; i++) {
-        rb->values[i] = 0;
+        rb->values[i].ts_ms = 0;
+        rb->values[i].value = 0;
     }
 }
 
-void ringbuf_push(ringbuf_t *rb, int v) {
+void ringbuf_push(ringbuf_t *rb, uint32_t ts_ms, int v) {
-    rb->values[rb->head] = v;
+    rb->values[rb->head].ts_ms = ts_ms;
+    rb->values[rb->head].value = v;
     rb->head = (rb->head + 1) % RINGBUF_SIZE;
 }
 
-void ringbuf_copy(const ringbuf_t *rb, int *out) {
+void ringbuf_copy(const ringbuf_t *rb, sample_t *out) {
     int idx = rb->head;
 
     for (int i = 0; i < RINGBUF_SIZE; i++) {

esp32/main/ringbuf.h

@@ -5,7 +5,12 @@
 #define RINGBUF_SIZE 10
 
 typedef struct {
-    int values[RINGBUF_SIZE];
+    uint32_t ts_ms;
+    int value;
+} sample_t;
+
+typedef struct {
+    sample_t values[RINGBUF_SIZE];
     int head;
 } ringbuf_t;
 
@@ -13,7 +18,6 @@ typedef struct {
 void ringbuf_init(ringbuf_t *rb);
 
 // Добавить значение
-void ringbuf_push(ringbuf_t *rb, int v);
+void ringbuf_push(ringbuf_t *rb, uint32_t ts_ms, int v);
 
-// Скопировать данные (в порядке времени)
+void ringbuf_copy(const ringbuf_t *rb, sample_t *out);
-void ringbuf_copy(const ringbuf_t *rb, int *out);

esp32/main/sampler_task.cpp

@@ -1,37 +1,43 @@
 #include "sampler_task.h"
-#include "adc_reader.h"
 #include "ringbuf.h"
+#include "ds18b20.h"   // добавим
 
 extern "C" {
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
+#include "esp_timer.h"
 }
 
-// буфер объявим здесь (глобальный для простоты)
+// буфер
 static ringbuf_t rb;
 
-// дать доступ другим модулям (sender потом возьмёт)
 ringbuf_t* sampler_get_buffer() {
     return &rb;
 }
 
 static void sampler_task(void *arg) {
-    while (1) {
-        int val = adc_reader_read();
-        ringbuf_push(&rb, val);
     
-        vTaskDelay(pdMS_TO_TICKS(100)); // 10 Гц
+    const TickType_t period = pdMS_TO_TICKS(6000);
+    TickType_t last_wake = xTaskGetTickCount();
+
+    while (1) {
+        int64_t now_ms = esp_timer_get_time() / 1000;
+
+        float temp = ds18b20_read();
+        ringbuf_push(&rb, now_ms, (int)(temp * 100));
+
+        vTaskDelayUntil(&last_wake, period);// 6 секунд
     }
 }
 
 void sampler_task_start() {
     ringbuf_init(&rb);
-    adc_reader_init();
+    ds18b20_init(GPIO_NUM_27);  // новый драйвер
 
     xTaskCreate(
         sampler_task,
         "sampler",
-        2048,
+        4096,
         NULL,
         5,
         NULL

esp32/main/sender_task.cpp

@@ -5,54 +5,88 @@
 
 #include <stdio.h>
 #include <time.h>
+
+
 #include "ws.h"
 
 extern "C" {
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
+#include "esp_timer.h"
 }
 
-static uint32_t msg_id = 1;
+static uint32_t last_send_ms = 0;
+static int64_t last_send_ts = 0;
 
-static void sender_task(void *arg) {
+static void sender_task(void* arg)
-    int data[RINGBUF_SIZE];
+{
+    ringbuf_t* rb = sampler_get_buffer();
 
-    while (1) {
+    last_send_ts = time(NULL);
-        vTaskDelay(pdMS_TO_TICKS(1000)); // 1 Гц
+    last_send_ms = esp_timer_get_time() / 1000;
+
+    while (1)
+    {
+        vTaskDelay(pdMS_TO_TICKS(50000)); // 1 мин^-1
 
         char buf[512];
+        uint32_t now_ms = esp_timer_get_time() / 1000;
+        time_t now_ts = time(NULL);
 
-        ringbuf_t *rb = sampler_get_buffer();
+        sample_t tmp[RINGBUF_SIZE];
-        ringbuf_copy(rb, data);
+        ringbuf_copy(rb, tmp);
 
-        time_t now = time(NULL);
+        int out_values[RINGBUF_SIZE * 2];
+        int count = 0;
+
+        for (int i = 0; i < RINGBUF_SIZE; i++)
+        {
+            if (tmp[i].ts_ms >= last_send_ms)
+            {
+                uint32_t delta = tmp[i].ts_ms - last_send_ms;
+
+                // кладём delta + value
+                out_values[count * 2 + 0] = delta;
+                out_values[count * 2 + 1] = tmp[i].value;
+                count++;
+            }
+        }
 
         int len = build_telemetry(
             buf,
             sizeof(buf),
-            msg_id++,
+            last_send_ts,
-            now,
+            1, // device_id (пока захардкожен)
-            1,              // device_id (пока захардкожен)
+            "t", // metric
-            "v",            // metric
+            "ds18b20", // source
-            "adc35",        // source
+            "c_x100", // unit
-            "raw",          // unit
+            out_values,
-            data,
+            count
-            RINGBUF_SIZE
         );
 
-        if (len > 0) {
+        if (len > 0)
-            if (ws_is_connected()) {
+        {
+            if (ws_is_connected())
+            {
                 ws_send(buf);
-            } else {
-                printf("%s\n", buf);  // fallback
             }
-        } else {
+            else
+            {
+                printf("%s\n", buf); // fallback
+            }
+        }
+        else
+        {
             printf("build_telemetry failed\n");
         }
+
+        last_send_ms = now_ms;
+        last_send_ts = now_ts;
     }
 }
 
-void sender_task_start() {
+void sender_task_start()
+{
     xTaskCreate(
         sender_task,
         "sender",

esp32/main/system_init.cpp

@@ -7,6 +7,7 @@
 #include "esp_event.h"
 #include "esp_netif.h"
 #include "ws.h"
+#include "gpio_init.h"
 
 static const char* TAG = "system";
 
@@ -14,6 +15,8 @@ void system_init()
 {
     ESP_LOGI("SYSTEM", "Initializing system...");
 
+    init_gpio();
+
     init_wifi(CONFIG_WIFI_SSID, CONFIG_WIFI_PASS);    // Запуск WiFI
 
     init_time(); // Установка времени

esp32/main/ws.cpp

@@ -3,19 +3,20 @@
 #include "esp_log.h"
 #include <string.h>
 #include "sdkconfig.h"
+#include "fw_command.h"
 
 static const char* TAG = "WS";
 
 static esp_websocket_client_handle_t client = nullptr;
 static bool connected = false;
 
-static void ws_event_handler(void *handler_args,
+static void ws_event_handler(void* handler_args,
                              esp_event_base_t base,
                              int32_t event_id,
-                             void *event_data)
+                             void* event_data)
 {
-    switch (event_id) {
+    switch (event_id)
-
+    {
     case WEBSOCKET_EVENT_CONNECTED:
         connected = true;
         ESP_LOGI(TAG, "Connected");
@@ -31,11 +32,36 @@ static void ws_event_handler(void *handler_args,
         ESP_LOGE(TAG, "Error");
         break;
 
-    case WEBSOCKET_EVENT_DATA: {
+    case WEBSOCKET_EVENT_DATA:
-            auto *data = (esp_websocket_event_data_t *)event_data;
+        {
+            auto* data = (esp_websocket_event_data_t*)event_data;
+
             ESP_LOGI(TAG, "Recv: %.*s", data->data_len, (char*)data->data_ptr);
+
+            // ⚠️ делаем null-terminated копию
+            char buf[512]; // подбери размер под свой максимум
+            int len = data->data_len;
+
+            if (len >= sizeof(buf)) {
+                ESP_LOGW(TAG, "Message too large");
+                break;
+            }
+
+            memcpy(buf, data->data_ptr, len);
+            buf[len] = '\0';
+
+            fw_cmd_t cmd {};
+
+            if (parse_fw_command(buf, &cmd)) {
+                ESP_LOGI(TAG, "FW command received");
+                ESP_LOGI(TAG, "URL: %s", cmd.url);
+                ESP_LOGI(TAG, "SHA256: %s", cmd.sha256);
+
+                // пока просто лог, без OTA
+            }
+
             break;
-    }
+        }
     }
 }
 
@@ -52,7 +78,8 @@ void ws_init(const char* uri)
 
 void ws_start()
 {
-    if (client) {
+    if (client)
+    {
         esp_websocket_client_start(client);
     }
 }
@@ -64,7 +91,8 @@ bool ws_is_connected()
 
 void ws_send(const char* data)
 {
-    if (connected && client) {
+    if (connected && client)
+    {
         esp_websocket_client_send_text(client, data, strlen(data), portMAX_DELAY);
     }
 }

esp32/managed_components/espressif__onewire_bus/.build-test-rules.yml

@@ -0,0 +1,6 @@
+onewire_bus/test_apps:
+  disable:
+    - if: CONFIG_NAME == "rmt" and SOC_RMT_SUPPORTED != 1
+      reason: RMT backend variant requires SOC RMT support
+    - if: CONFIG_NAME == "uart" and SOC_UART_SUPPORTED != 1
+      reason: UART backend variant requires SOC UART support

esp32/managed_components/espressif__onewire_bus/.component_hash

@@ -0,0 +1 @@
+d709015ba466095259228521cf1bad9c0cdaaa42a92ea5d9c88ec6c28ae89e9b

esp32/managed_components/espressif__onewire_bus/CHANGELOG.md

@@ -0,0 +1,19 @@
+## 1.1.0
+
+- Add UART backend support for 1-Wire bus (`onewire_new_bus_uart`) alongside the existing RMT backend.
+
+## 1.0.4
+
+- Support `en_pull_up` config option in `onewire_bus_config_t`, which can enable the internal pull-up resistor on the GPIO pin used for the one-wire bus. This is useful when using a GPIO pin that does not have a pull-up resistor connected externally.
+
+## 1.0.3
+
+- Improve the driver to support esp-idf v6.0
+
+## 1.0.2
+
+- raise recovery time to support more sensor on longer wire (d0b2b52)
+
+## 1.0.0
+
+- Initial driver version, with the RMT driver as backend controller

esp32/managed_components/espressif__onewire_bus/CHECKSUMS.json

@@ -0,0 +1 @@
+{"version":"1.0","algorithm":"sha256","created_at":"2026-04-02T08:31:31.921867+00:00","files":[{"path":".build-test-rules.yml","size":272,"hash":"d34faa08f404a108c17bcaf9709561dbc978c4f4fea0b912857758064430e069"},{"path":"CHANGELOG.md","size":591,"hash":"6be143366596176ad9f2d17932154117ef861918881e5abcfce678d55331e361"},{"path":"CMakeLists.txt","size":742,"hash":"8f26f2f876456b7533884d02b72dfee3481fe8617420c34cbfacf8c03dbc187a"},{"path":"LICENSE","size":11358,"hash":"cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30"},{"path":"README.md","size":675,"hash":"ebc34c6d6383f828a433fced21289cc24a1248a0383c240aabb95912170c1cc6"},{"path":"idf_component.yml","size":386,"hash":"4054b22a198bae53f75aeacced4a6577dbd067df3d07567f0ff3930164d2bb10"},{"path":"include/onewire_bus.h","size":2993,"hash":"39804a54186091e6f6b17aba786d5e78b70e9ad8e9bbd79cf31989f282dada21"},{"path":"include/onewire_bus_impl_rmt.h","size":1323,"hash":"a8aeebf3cd5f23ddd00c76ec43dfd6f1a30eee819814fb0c0d50a1e292834511"},{"path":"include/onewire_bus_impl_uart.h","size":1253,"hash":"403a3cb182173148f7999dbfbd800b9baab80f51c3f00607b1ccfc18a91af108"},{"path":"include/onewire_cmd.h","size":356,"hash":"f0de787a3337b59e6a85c8a245ef5b56710830233ceeabf5fe59d1c0a0c50b38"},{"path":"include/onewire_crc.h","size":584,"hash":"9db2a7b437a6f72a0711698c9fad5ceca60458e828557cc38a3c8fc217fd5e06"},{"path":"include/onewire_device.h","size":1799,"hash":"f6b8202100de34d4b102953839e10df33b7850c35c599fb1d5bcf33ec1305773"},{"path":"include/onewire_types.h","size":1107,"hash":"bbfbaffac8df97fe53fcf42550f63dad9e3c29fac3fb26a03d735075eed85b31"},{"path":"interface/onewire_bus_interface.h","size":3196,"hash":"b03cea2218f99845b4486b7112760e08e4b7eb6b6dcc238f8d745afc593eae19"},{"path":"src/onewire_bus_api.c","size":1512,"hash":"894fdc649d552fe090c19bd3eb9e1433db71f95b8455b86faf5463636905ab3e"},{"path":"src/onewire_bus_impl_rmt.c","size":21406,"hash":"2e48338edb5e72065c239863811e387adc7164c2bb0f344bbca7a8e4ab07f624"},{"path":"src/onewire_bus_impl_uart.c","size":13129,"hash":"00f18bf1c3ea011c0952ca8dbf898a74094985932d7da2b4c8ff15ad99244576"},{"path":"src/onewire_crc.c","size":2193,"hash":"06a7ce5ffffbd1cbf4de35155cba2d5b903f718a0fbc3478265c09a4458a4ce0"},{"path":"src/onewire_device.c","size":4934,"hash":"3612afec5795eb9f47adef0b340c33c8584dde4d66d9581621ae203a6e9e031a"},{"path":"test_apps/CMakeLists.txt","size":135,"hash":"4035fd2167868739138e691d3080616b9d3b5c69adf567fbd33fb74b36a143ce"},{"path":"test_apps/pytest_onewire_bus.py","size":722,"hash":"c00451c79c16e3e3010045c21a21cb8c8e82217b898946061a4d133d096eca11"},{"path":"test_apps/sdkconfig.ci.rmt","size":75,"hash":"e8b859d77cdf1dc4125c5cdb4681dab1219db72c845f3f1b62f6d06397d804fa"},{"path":"test_apps/sdkconfig.ci.uart","size":75,"hash":"8413491b74b639e0a4e4d29968989d8434ed44bd225664352b631b7794c56320"},{"path":"test_apps/main/CMakeLists.txt","size":127,"hash":"2c724c0cf0fe496ed895d2360a281ad0c81b398c43cdfccb290c5b627c852f9a"},{"path":"test_apps/main/Kconfig.projbuild","size":1782,"hash":"70ccb326b523ed810f1597fe51c8b12a120156bd431552d0106c4f8e468c10c1"},{"path":"test_apps/main/idf_component.yml","size":83,"hash":"76ba47c24c863880ee8e6667ccde3ca1b68454993f31fd45755d5faa2ab83edc"},{"path":"test_apps/main/onewire_bus_test.c","size":2906,"hash":"f25f3a330bcc50fb30da60470c38401b88a3858415abe56668cf386e4f49a2d4"}]}

esp32/managed_components/espressif__onewire_bus/CMakeLists.txt

@@ -0,0 +1,23 @@
+set(srcs "src/onewire_bus_api.c"
+         "src/onewire_crc.c"
+         "src/onewire_device.c")
+
+if(CONFIG_SOC_RMT_SUPPORTED)
+     list(APPEND srcs "src/onewire_bus_impl_rmt.c")
+endif()
+
+if(CONFIG_SOC_UART_SUPPORTED)
+     list(APPEND srcs "src/onewire_bus_impl_uart.c")
+endif()
+
+set(priv_requires)
+# Starting from esp-idf v5.3, the peripheral drivers are in separate components
+if("${IDF_VERSION_MAJOR}.${IDF_VERSION_MINOR}" VERSION_GREATER_EQUAL "5.3")
+    list(APPEND priv_requires "esp_driver_rmt" "esp_driver_uart" "esp_driver_gpio")
+else()
+    list(APPEND priv_requires "driver")
+endif()
+
+idf_component_register(SRCS ${srcs}
+                       INCLUDE_DIRS "include" "interface"
+                       PRIV_REQUIRES ${priv_requires})

esp32/managed_components/espressif__onewire_bus/LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
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+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
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+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
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+
+   4. Redistribution. You may reproduce and distribute copies of the
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esp32/managed_components/espressif__onewire_bus/README.md

@@ -0,0 +1,13 @@
+# Dallas 1-Wire Bus Driver
+
+[![Component Registry](https://components.espressif.com/components/espressif/onewire_bus/badge.svg)](https://components.espressif.com/components/espressif/onewire_bus)
+
+This directory contains an implementation for Dallas 1-Wire bus by different peripherals.
+The following low-level backends are currently supported:
+
+- RMT backend (`onewire_new_bus_rmt`)
+- UART backend (`onewire_new_bus_uart`)
+
+## Appendix
+
+* [DS18B20 device driver based on the 1-Wire Bus driver](https://components.espressif.com/components/espressif/ds18b20) and the [DS18B20 Example](https://github.com/espressif/esp-bsp/tree/master/components/ds18b20/examples/ds18b20-read)

esp32/managed_components/espressif__onewire_bus/idf_component.yml

@@ -0,0 +1,10 @@
+dependencies:
+  idf: '>=5.0'
+description: Driver for Dallas 1-Wire bus
+issues: https://github.com/espressif/idf-extra-components/issues
+repository: git://github.com/espressif/idf-extra-components.git
+repository_info:
+  commit_sha: bd6b21799cb9034e050a41b2c299b52a7e71be83
+  path: onewire_bus
+url: https://github.com/espressif/idf-extra-components/tree/master/onewire_bus
+version: 1.1.0

esp32/managed_components/espressif__onewire_bus/include/onewire_bus.h

@@ -0,0 +1,96 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <stdint.h>
+#include "esp_err.h"
+#include "soc/soc_caps.h"
+#include "onewire_types.h"
+#if SOC_RMT_SUPPORTED
+#include "onewire_bus_impl_rmt.h"
+#endif
+#if SOC_UART_SUPPORTED
+#include "onewire_bus_impl_uart.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Write bytes to 1-wire bus
+ *
+ * @param[in] bus 1-Wire bus handle
+ * @param[in] tx_data pointer to data to be sent
+ * @param[in] tx_data_size size of data to be sent, in bytes
+ * @return
+ *      - ESP_OK: Write bytes to 1-Wire bus successfully
+ *      - ESP_ERR_INVALID_ARG: Write bytes to 1-Wire bus failed because of invalid argument
+ *      - ESP_FAIL: Write bytes to 1-Wire bus failed because of other errors
+ */
+esp_err_t onewire_bus_write_bytes(onewire_bus_handle_t bus, const uint8_t *tx_data, uint8_t tx_data_size);
+
+/**
+ * @brief Read bytes from 1-wire bus
+ *
+ * @param[in] bus 1-wire bus handle
+ * @param[out] rx_buf pointer to buffer to store received data
+ * @param[in] rx_buf_size size of buffer to store received data, in bytes
+ * @return
+ *      - ESP_OK: Read bytes from 1-Wire bus successfully
+ *      - ESP_ERR_INVALID_ARG: Read bytes from 1-Wire bus failed because of invalid argument
+ *      - ESP_FAIL: Read bytes from 1-Wire bus failed because of other errors
+ */
+esp_err_t onewire_bus_read_bytes(onewire_bus_handle_t bus, uint8_t *rx_buf, size_t rx_buf_size);
+
+/**
+ * @brief Write a bit to 1-wire bus, this is a blocking function
+ *
+ * @param[in] handle 1-wire bus handle
+ * @param[in] tx_bit bit to transmit, 0 for zero bit, other for one bit
+ * @return
+ *         - ESP_OK                Write bit to 1-wire bus successfully.
+ *         - ESP_ERR_INVALID_ARG   Invalid argument.
+ */
+esp_err_t onewire_bus_write_bit(onewire_bus_handle_t bus, uint8_t tx_bit);
+
+/**
+ * @brief Read a bit from 1-wire bus
+ *
+ * @param[in] handle 1-wire bus handle
+ * @param[out] rx_bit received bit, 0 for zero bit, 1 for one bit
+ * @return
+ *         - ESP_OK                Read bit from 1-wire bus successfully.
+ *         - ESP_ERR_INVALID_ARG   Invalid argument.
+ */
+esp_err_t onewire_bus_read_bit(onewire_bus_handle_t bus, uint8_t *rx_bit);
+
+/**
+ * @brief Send reset pulse to the bus, and check if there are devices attached to the bus
+ *
+ * @param[in] bus 1-Wire bus handle
+ *
+ * @return
+ *      - ESP_OK: Reset 1-Wire bus successfully and find device on the bus
+ *      - ESP_ERR_NOT_FOUND: Reset 1-Wire bus successfully but no device found on the bus
+ *      - ESP_FAIL: Reset 1-Wire bus failed because of other errors
+ */
+esp_err_t onewire_bus_reset(onewire_bus_handle_t bus);
+
+/**
+ * @brief Free 1-Wire bus resources
+ *
+ * @param[in] bus 1-Wire bus handle
+ *
+ * @return
+ *      - ESP_OK: Free resources successfully
+ *      - ESP_FAIL: Free resources failed because error occurred
+ */
+esp_err_t onewire_bus_del(onewire_bus_handle_t bus);
+
+#ifdef __cplusplus
+}
+#endif

esp32/managed_components/espressif__onewire_bus/include/onewire_bus_impl_rmt.h

@@ -0,0 +1,42 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <stdint.h>
+#include "esp_err.h"
+#include "onewire_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief 1-Wire bus RMT specific configuration
+ */
+typedef struct {
+    uint32_t max_rx_bytes; /*!< Set the largest possible single receive size,
+                                which determines the size of the internal buffer that used to save the receiving RMT symbols */
+} onewire_bus_rmt_config_t;
+
+/**
+ * @brief Create 1-Wire bus with RMT backend
+ *
+ * @note One 1-Wire bus utilizes a pair of RMT TX and RX channels
+ *
+ * @param[in] bus_config 1-Wire bus configuration
+ * @param[in] rmt_config RMT specific configuration
+ * @param[out] ret_bus Returned 1-Wire bus handle
+ * @return
+ *      - ESP_OK: create 1-Wire bus handle successfully
+ *      - ESP_ERR_INVALID_ARG: create 1-Wire bus handle failed because of invalid argument
+ *      - ESP_ERR_NO_MEM: create 1-Wire bus handle failed because of out of memory
+ *      - ESP_FAIL: create 1-Wire bus handle failed because some other error
+ */
+esp_err_t onewire_new_bus_rmt(const onewire_bus_config_t *bus_config, const onewire_bus_rmt_config_t *rmt_config, onewire_bus_handle_t *ret_bus);
+
+#ifdef __cplusplus
+}
+#endif

esp32/managed_components/espressif__onewire_bus/include/onewire_bus_impl_uart.h

@@ -0,0 +1,42 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <stdint.h>
+#include "esp_err.h"
+#include "onewire_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief 1-Wire bus UART specific configuration
+ */
+typedef struct {
+    int uart_port_num; /*!< UART port number, e.g. UART_NUM_1 */
+} onewire_bus_uart_config_t;
+
+/**
+ * @brief Create 1-Wire bus with UART backend
+ *
+ * @note TX and RX will both be configured to bus_config->bus_gpio_num.
+ *       And this GPIO will be configured as open-drain mode.
+ *
+ * @param[in] bus_config 1-Wire bus configuration
+ * @param[in] uart_config UART specific configuration
+ * @param[out] ret_bus Returned 1-Wire bus handle
+ * @return
+ *      - ESP_OK: create 1-Wire bus handle successfully
+ *      - ESP_ERR_INVALID_ARG: create 1-Wire bus handle failed because of invalid argument
+ *      - ESP_ERR_NO_MEM: create 1-Wire bus handle failed because of out of memory
+ *      - ESP_FAIL: create 1-Wire bus handle failed because some other error
+ */
+esp_err_t onewire_new_bus_uart(const onewire_bus_config_t *bus_config, const onewire_bus_uart_config_t *uart_config, onewire_bus_handle_t *ret_bus);
+
+#ifdef __cplusplus
+}
+#endif

esp32/managed_components/espressif__onewire_bus/include/onewire_cmd.h

@@ -0,0 +1,12 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#define ONEWIRE_CMD_SEARCH_NORMAL      0xF0
+#define ONEWIRE_CMD_MATCH_ROM          0x55
+#define ONEWIRE_CMD_SKIP_ROM           0xCC
+#define ONEWIRE_CMD_SEARCH_ALARM       0xEC
+#define ONEWIRE_CMD_READ_POWER_SUPPLY  0xB4

esp32/managed_components/espressif__onewire_bus/include/onewire_crc.h

@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <stdint.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Calculate Dallas CRC8 value of a given buffer
+ *
+ * @param[in] init_crc Initial CRC value
+ * @param[in] input Input buffer to calculate CRC value
+ * @param[in] input_size Size of input buffer, in bytes
+ * @return CRC8 result of the input buffer
+ */
+uint8_t onewire_crc8(uint8_t init_crc, uint8_t *input, size_t input_size);
+
+#ifdef __cplusplus
+}
+#endif

esp32/managed_components/espressif__onewire_bus/include/onewire_device.h

@@ -0,0 +1,63 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <stdint.h>
+#include "esp_err.h"
+#include "onewire_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief 1-Wire device generic type
+ */
+typedef struct onewire_device_t {
+    onewire_bus_handle_t bus;         /*!< Which bus the 1-Wire device is attached to */
+    onewire_device_address_t address; /*!< Device address (represented by its internal ROM ID) */
+} onewire_device_t;
+
+/**
+ * @brief Create an iterator to enumerate the 1-Wire devices on the bus
+ *
+ * @param[in] bus 1-Wire bus handle
+ * @param[out] ret_iter Returned created device iterator
+ * @return
+ *      - ESP_OK: Create device iterator successfully
+ *      - ESP_ERR_INVALID_ARG: Invalid argument
+ *      - ESP_ERR_NO_MEM: No memory to create device iterator
+ *      - ESP_FAIL: Other errors
+ */
+esp_err_t onewire_new_device_iter(onewire_bus_handle_t bus, onewire_device_iter_handle_t *ret_iter);
+
+/**
+ * @brief Delete the device iterator
+ *
+ * @param[in] iter Device iterator handle
+ * @return
+ *      - ESP_OK: Delete device iterator successfully
+ *      - ESP_ERR_INVALID_ARG: Invalid argument
+ *      - ESP_FAIL: Other errors
+ */
+esp_err_t onewire_del_device_iter(onewire_device_iter_handle_t iter);
+
+/**
+ * @brief Get the next 1-Wire device from the iterator
+ *
+ * @param[in] iter Device iterator handle
+ * @param[out] dev Returned 1-Wire device handle
+ * @return
+ *      - ESP_OK: Get next device successfully
+ *      - ESP_ERR_INVALID_ARG: Invalid argument
+ *      - ESP_ERR_NOT_FOUND: No more device to get
+ *      - ESP_FAIL: Other errors
+ */
+esp_err_t onewire_device_iter_get_next(onewire_device_iter_handle_t iter, onewire_device_t *dev);
+
+#ifdef __cplusplus
+}
+#endif

esp32/managed_components/espressif__onewire_bus/include/onewire_types.h

@@ -0,0 +1,43 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Type of 1-Wire bus handle
+ */
+typedef struct onewire_bus_t *onewire_bus_handle_t;
+
+/**
+ * @brief Type of the address for a 1-Wire compatible device
+ */
+typedef uint64_t onewire_device_address_t;
+
+/**
+ * @brief Type of 1-Wire device iterator handle
+ */
+typedef struct onewire_device_iter_t *onewire_device_iter_handle_t;
+
+/**
+ * @brief 1-Wire bus configuration
+ */
+typedef struct {
+    int bus_gpio_num; /*!< GPIO number that used by the 1-Wire bus */
+    struct onewire_bus_config_flags {
+        uint32_t en_pull_up: 1; /*!< Set true to enable internal pull-up resistor.
+                                     Please note the internal pull-up resistor cannot provide enough current for some devices,
+                                     so external pull-up resistor is still recommended. */
+    } flags; /*!< Configuration flags for the bus */
+} onewire_bus_config_t;
+
+#ifdef __cplusplus
+}
+#endif

esp32/managed_components/espressif__onewire_bus/interface/onewire_bus_interface.h

@@ -0,0 +1,97 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <stdint.h>
+#include "esp_err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct onewire_bus_t onewire_bus_t; /*!< Type of 1-Wire bus */
+
+/**
+ * @brief 1-Wire bus interface definition
+ */
+struct onewire_bus_t {
+    /**
+     * @brief Write bytes to 1-wire bus
+     *
+     * @note This is a blocking function
+     *
+     * @param[in] bus 1-Wire bus handle
+     * @param[in] tx_data pointer to data to be sent
+     * @param[in] tx_data_size size of data to be sent, in bytes
+     * @return
+     *      - ESP_OK: Write bytes to 1-Wire bus successfully
+     *      - ESP_ERR_INVALID_ARG: Write bytes to 1-Wire bus failed because of invalid argument
+     *      - ESP_FAIL: Write bytes to 1-Wire bus failed because of other errors
+     */
+    esp_err_t (*write_bytes)(onewire_bus_t *bus, const uint8_t *tx_data, uint8_t tx_data_size);
+
+    /**
+     * @brief Read bytes from 1-wire bus
+     *
+     * @param[in] bus 1-wire bus handle
+     * @param[out] rx_buf pointer to buffer to store received data
+     * @param[in] rx_buf_size size of buffer to store received data, in bytes
+     * @return
+     *      - ESP_OK: Read bytes from 1-Wire bus successfully
+     *      - ESP_ERR_INVALID_ARG: Read bytes from 1-Wire bus failed because of invalid argument
+     *      - ESP_FAIL: Read bytes from 1-Wire bus failed because of other errors
+     */
+    esp_err_t (*read_bytes)(onewire_bus_t *bus, uint8_t *rx_buf, size_t rx_buf_size);
+
+    /**
+     * @brief Write a bit to 1-wire bus, this is a blocking function
+     *
+     * @param[in] handle 1-wire bus handle
+     * @param[in] tx_bit bit to transmit, 0 for zero bit, other for one bit
+     * @return
+     *         - ESP_OK                Write bit to 1-wire bus successfully.
+     *         - ESP_ERR_INVALID_ARG   Invalid argument.
+     */
+    esp_err_t (*write_bit)(onewire_bus_handle_t handle, uint8_t tx_bit);
+
+    /**
+     * @brief Read a bit from 1-wire bus
+     *
+     * @param[in] handle 1-wire bus handle
+     * @param[out] rx_bit received bit, 0 for zero bit, 1 for one bit
+     * @return
+     *         - ESP_OK                Read bit from 1-wire bus successfully.
+     *         - ESP_ERR_INVALID_ARG   Invalid argument.
+     */
+    esp_err_t (*read_bit)(onewire_bus_handle_t handle, uint8_t *rx_bit);
+
+    /**
+     * @brief Send reset pulse to the bus, and check if there are devices attached to the bus
+     *
+     * @param[in] bus 1-Wire bus handle
+     *
+     * @return
+     *      - ESP_OK: Reset 1-Wire bus successfully and find device on the bus
+     *      - ESP_ERR_NOT_FOUND: Reset 1-Wire bus successfully but no device found on the bus
+     *      - ESP_FAIL: Reset 1-Wire bus failed because of other errors
+     */
+    esp_err_t (*reset)(onewire_bus_t *bus);
+
+    /**
+     * @brief Free 1-Wire bus resources
+     *
+     * @param[in] bus 1-Wire bus handle
+     *
+     * @return
+     *      - ESP_OK: Free resources successfully
+     *      - ESP_FAIL: Free resources failed because error occurred
+     */
+    esp_err_t (*del)(onewire_bus_t *bus);
+};
+
+#ifdef __cplusplus
+}
+#endif

esp32/managed_components/espressif__onewire_bus/src/onewire_bus_api.c

@@ -0,0 +1,47 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include "esp_log.h"
+#include "esp_check.h"
+#include "onewire_types.h"
+#include "onewire_bus_interface.h"
+
+static const char *TAG = "1-wire";
+
+esp_err_t onewire_bus_reset(onewire_bus_handle_t bus)
+{
+    ESP_RETURN_ON_FALSE(bus, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+    return bus->reset(bus);
+}
+
+esp_err_t onewire_bus_write_bytes(onewire_bus_handle_t bus, const uint8_t *tx_data, uint8_t tx_data_size)
+{
+    ESP_RETURN_ON_FALSE(bus && tx_data && tx_data_size, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+    return bus->write_bytes(bus, tx_data, tx_data_size);
+}
+
+esp_err_t onewire_bus_read_bytes(onewire_bus_handle_t bus, uint8_t *rx_buf, size_t rx_buf_size)
+{
+    ESP_RETURN_ON_FALSE(bus && rx_buf && rx_buf_size, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+    return bus->read_bytes(bus, rx_buf, rx_buf_size);
+}
+
+esp_err_t onewire_bus_write_bit(onewire_bus_handle_t bus, uint8_t tx_bit)
+{
+    ESP_RETURN_ON_FALSE(bus, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+    return bus->write_bit(bus, tx_bit);
+}
+
+esp_err_t onewire_bus_read_bit(onewire_bus_handle_t bus, uint8_t *rx_bit)
+{
+    ESP_RETURN_ON_FALSE(bus && rx_bit, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+    return bus->read_bit(bus, rx_bit);
+}
+
+esp_err_t onewire_bus_del(onewire_bus_handle_t bus)
+{
+    ESP_RETURN_ON_FALSE(bus, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+    return bus->del(bus);
+}

esp32/managed_components/espressif__onewire_bus/src/onewire_bus_impl_rmt.c

@@ -0,0 +1,521 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <string.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/queue.h"
+#include "freertos/semphr.h"
+#include "esp_check.h"
+#include "esp_attr.h"
+#include "driver/rmt_tx.h"
+#include "driver/rmt_rx.h"
+#include "driver/gpio.h"
+#include "esp_private/gpio.h"
+#include "onewire_bus_impl_rmt.h"
+#include "onewire_bus_interface.h"
+#include "esp_idf_version.h"
+
+static const char *TAG = "1-wire.rmt";
+
+#define ONEWIRE_RMT_RESOLUTION_HZ               1000000 // RMT channel default resolution for 1-wire bus, 1MHz, 1tick = 1us
+#define ONEWIRE_RMT_DEFAULT_TRANS_QUEUE_SIZE    4
+
+// the memory size of each RMT channel, in words (4 bytes)
+#if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2
+#define ONEWIRE_RMT_DEFAULT_MEM_BLOCK_SYMBOLS   64
+#else
+#define ONEWIRE_RMT_DEFAULT_MEM_BLOCK_SYMBOLS   48
+#endif
+
+// for chips whose RMT RX channel doesn't support ping-pong, we need the user to tell the maximum number of bytes will be received
+#if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2
+// one RMT symbol represents one bit, so x8
+#define ONEWIRE_RMT_RX_MEM_BLOCK_SIZE           (rmt_config->max_rx_bytes * 8)
+#else // otherwise, we just use one memory block, to save resources
+#define ONEWIRE_RMT_RX_MEM_BLOCK_SIZE           ONEWIRE_RMT_DEFAULT_MEM_BLOCK_SYMBOLS
+#endif
+
+/*
+Reset Pulse:
+
+          | RESET_PULSE | RESET_WAIT_DURATION |
+          | _DURATION   |                     |
+          |             |   | | RESET     |   |
+          |             | * | | _PRESENCE |   |
+          |             |   | | _DURATION |   |
+----------+             +-----+           +--------------
+          |             |     |           |
+          |             |     |           |
+          |             |     |           |
+          +-------------+     +-----------+
+*: RESET_PRESENCE_WAIT_DURATION
+*/
+#define ONEWIRE_RESET_PULSE_DURATION            500 // duration of reset bit
+#define ONEWIRE_RESET_WAIT_DURATION             200 // how long should master wait for device to show its presence
+#define ONEWIRE_RESET_PRESENCE_WAIT_DURATION_MIN 15 // minimum duration for master to wait device to show its presence
+#define ONEWIRE_RESET_PRESENCE_DURATION_MIN      60 // minimum duration for master to recognize device as present
+
+/*
+Write 1 bit:
+
+          | SLOT_START | SLOT_BIT  | SLOT_RECOVERY | NEXT
+          | _DURATION  | _DURATION | _DURATION     | SLOT
+          |            |           |               |
+----------+            +-------------------------------------
+          |            |
+          |            |
+          |            |
+          +------------+
+
+Write 0 bit:
+
+          | SLOT_START | SLOT_BIT  | SLOT_RECOVERY | NEXT
+          | _DURATION  | _DURATION | _DURATION     | SLOT
+          |            |           |               |
+----------+                        +-------------------------
+          |                        |
+          |                        |
+          |                        |
+          +------------------------+
+
+Read 1 bit:
+
+
+          | SLOT_START | SLOT_BIT_DURATION | SLOT_RECOVERY | NEXT
+          | _DURATION  |                   | _DURATION     | SLOT
+          |            | SLOT_BIT_   |     |               |
+          |            | SAMPLE_TIME |     |               |
+----------+            +----------------------------------------------
+          |            |
+          |            |
+          |            |
+          +------------+
+
+Read 0 bit:
+
+          | SLOT_START | SLOT_BIT_DURATION | SLOT_RECOVERY | NEXT
+          | _DURATION  |                   | _DURATION     | SLOT
+          |            | SLOT_BIT_   |     |               |
+          |            | SAMPLE_TIME |     |               |
+----------+            |             |  +-----------------------------
+          |            |                |
+          |            |   PULLED DOWN  |
+          |            |    BY DEVICE   |
+          +-----------------------------+
+*/
+#define ONEWIRE_SLOT_START_DURATION             2  // bit start pulse duration
+#define ONEWIRE_SLOT_BIT_DURATION               60 // duration for each bit to transmit
+// refer to https://www.maximintegrated.com/en/design/technical-documents/app-notes/3/3829.html for more information
+#define ONEWIRE_SLOT_RECOVERY_DURATION          5  // recovery time between each bit, should be longer in parasite power mode
+#define ONEWIRE_SLOT_BIT_SAMPLE_TIME            15 // how long after bit start pulse should the master sample from the bus
+
+typedef struct {
+    onewire_bus_t base; /*!< base class */
+    rmt_channel_handle_t tx_channel; /*!< rmt tx channel handler */
+    rmt_channel_handle_t rx_channel; /*!< rmt rx channel handler */
+
+    gpio_num_t data_gpio_num; /*!< GPIO number for 1-wire bus */
+
+    rmt_encoder_handle_t tx_bytes_encoder; /*!< used to encode commands and data */
+    rmt_encoder_handle_t tx_copy_encoder; /*!< used to encode reset pulse and bits */
+
+    rmt_symbol_word_t *rx_symbols_buf; /*!< hold rmt raw symbols */
+
+    size_t max_rx_bytes; /*!< buffer size in byte for single receive transaction */
+
+    QueueHandle_t receive_queue;
+    SemaphoreHandle_t bus_mutex;
+} onewire_bus_rmt_obj_t;
+
+static rmt_symbol_word_t onewire_reset_pulse_symbol = {
+    .level0 = 0,
+    .duration0 = ONEWIRE_RESET_PULSE_DURATION,
+    .level1 = 1,
+    .duration1 = ONEWIRE_RESET_WAIT_DURATION
+};
+
+static rmt_symbol_word_t onewire_bit0_symbol = {
+    .level0 = 0,
+    .duration0 = ONEWIRE_SLOT_START_DURATION + ONEWIRE_SLOT_BIT_DURATION,
+    .level1 = 1,
+    .duration1 = ONEWIRE_SLOT_RECOVERY_DURATION
+};
+
+static rmt_symbol_word_t onewire_bit1_symbol = {
+    .level0 = 0,
+    .duration0 = ONEWIRE_SLOT_START_DURATION,
+    .level1 = 1,
+    .duration1 = ONEWIRE_SLOT_BIT_DURATION + ONEWIRE_SLOT_RECOVERY_DURATION
+};
+
+const static rmt_transmit_config_t onewire_rmt_tx_config = {
+    .loop_count = 0,     // no transfer loop
+    .flags.eot_level = 1 // onewire bus should be released in IDLE
+};
+
+const static rmt_receive_config_t onewire_rmt_rx_config = {
+    .signal_range_min_ns = 1000000000 / ONEWIRE_RMT_RESOLUTION_HZ,
+    .signal_range_max_ns = (ONEWIRE_RESET_PULSE_DURATION + ONEWIRE_RESET_WAIT_DURATION) * 1000,
+};
+
+static esp_err_t onewire_bus_rmt_read_bit(onewire_bus_handle_t bus, uint8_t *rx_bit);
+static esp_err_t onewire_bus_rmt_write_bit(onewire_bus_handle_t bus, uint8_t tx_bit);
+static esp_err_t onewire_bus_rmt_read_bytes(onewire_bus_handle_t bus, uint8_t *rx_buf, size_t rx_buf_size);
+static esp_err_t onewire_bus_rmt_write_bytes(onewire_bus_handle_t bus, const uint8_t *tx_data, uint8_t tx_data_size);
+static esp_err_t onewire_bus_rmt_reset(onewire_bus_handle_t bus);
+static esp_err_t onewire_bus_rmt_del(onewire_bus_handle_t bus);
+static esp_err_t onewire_bus_rmt_destroy(onewire_bus_rmt_obj_t *bus_rmt);
+
+IRAM_ATTR
+bool onewire_rmt_rx_done_callback(rmt_channel_handle_t channel, const rmt_rx_done_event_data_t *edata, void *user_data)
+{
+    BaseType_t task_woken = pdFALSE;
+    onewire_bus_rmt_obj_t *bus_rmt = (onewire_bus_rmt_obj_t *)user_data;
+
+    xQueueSendFromISR(bus_rmt->receive_queue, edata, &task_woken);
+
+    return task_woken;
+}
+
+/*
+[0].0 means symbol[0].duration0
+
+First reset pulse after rmt channel init:
+
+Bus is low | Reset | Wait |  Device  |  Bus Idle
+after init | Pulse |      | Presence |
+                   +------+          +-----------
+                   |      |          |
+                   |      |          |
+                   |      |          |
+-------------------+      +----------+
+                   1      2          3
+
+          [0].1     [0].0     [1].1     [1].0
+
+
+Following reset pulses:
+
+Bus is high | Reset | Wait |  Device  |  Bus Idle
+after init  | Pulse |      | Presence |
+------------+       +------+          +-----------
+            |       |      |          |
+            |       |      |          |
+            |       |      |          |
+            +-------+      +----------+
+            1       2      3          4
+
+              [0].0  [0].1     [1].0    [1].1
+*/
+static bool onewire_rmt_check_presence_pulse(rmt_symbol_word_t *rmt_symbols, size_t symbol_num)
+{
+    bool ret = false;
+    if (symbol_num >= 2) { // there should be at lease 2 symbols(3 or 4 edges)
+        if (rmt_symbols[0].level1 == 1) { // bus is high before reset pulse
+            if (rmt_symbols[0].duration1 > ONEWIRE_RESET_PRESENCE_WAIT_DURATION_MIN &&
+                    rmt_symbols[1].duration0 > ONEWIRE_RESET_PRESENCE_DURATION_MIN) {
+                ret = true;
+            }
+        } else { // bus is low before reset pulse(first pulse after rmt channel init)
+            if (rmt_symbols[0].duration0 > ONEWIRE_RESET_PRESENCE_WAIT_DURATION_MIN &&
+                    rmt_symbols[1].duration1 > ONEWIRE_RESET_PRESENCE_DURATION_MIN) {
+                ret = true;
+            }
+        }
+    }
+    return ret;
+}
+
+static void onewire_rmt_decode_data(rmt_symbol_word_t *rmt_symbols, size_t symbol_num, uint8_t *rx_buf, size_t rx_buf_size)
+{
+    size_t byte_pos = 0;
+    size_t bit_pos = 0;
+    for (size_t i = 0; i < symbol_num; i ++) {
+        if (rmt_symbols[i].duration0 > ONEWIRE_SLOT_BIT_SAMPLE_TIME) { // 0 bit
+            rx_buf[byte_pos] &= ~(1 << bit_pos); // LSB first
+        } else { // 1 bit
+            rx_buf[byte_pos] |= 1 << bit_pos;
+        }
+        bit_pos ++;
+        if (bit_pos >= 8) {
+            bit_pos = 0;
+            byte_pos ++;
+            if (byte_pos >= rx_buf_size) {
+                break;
+            }
+        }
+    }
+}
+
+esp_err_t onewire_new_bus_rmt(const onewire_bus_config_t *bus_config, const onewire_bus_rmt_config_t *rmt_config, onewire_bus_handle_t *ret_bus)
+{
+    esp_err_t ret = ESP_OK;
+    onewire_bus_rmt_obj_t *bus_rmt = NULL;
+    ESP_RETURN_ON_FALSE(bus_config && rmt_config && ret_bus, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+
+    bus_rmt = calloc(1, sizeof(onewire_bus_rmt_obj_t));
+    ESP_RETURN_ON_FALSE(bus_rmt, ESP_ERR_NO_MEM, TAG, "no mem for onewire_bus_rmt_obj_t");
+    bus_rmt->data_gpio_num = GPIO_NUM_NC;
+
+    // create rmt bytes encoder to transmit 1-wire commands and data
+    rmt_bytes_encoder_config_t bytes_encoder_config = {
+        .bit0 = onewire_bit0_symbol,
+        .bit1 = onewire_bit1_symbol,
+        .flags.msb_first = 0,
+    };
+    ESP_GOTO_ON_ERROR(rmt_new_bytes_encoder(&bytes_encoder_config, &bus_rmt->tx_bytes_encoder),
+                      err, TAG, "create bytes encoder failed");
+
+    // create rmt copy encoder to transmit 1-wire reset pulse or bits
+    rmt_copy_encoder_config_t copy_encoder_config = {};
+    ESP_GOTO_ON_ERROR(rmt_new_copy_encoder(&copy_encoder_config, &bus_rmt->tx_copy_encoder),
+                      err, TAG, "create copy encoder failed");
+
+    // create RX and TX channels and bind them to the same GPIO
+    rmt_rx_channel_config_t onewire_rx_channel_cfg = {
+        .clk_src = RMT_CLK_SRC_DEFAULT,
+        .resolution_hz = ONEWIRE_RMT_RESOLUTION_HZ,
+        .gpio_num = bus_config->bus_gpio_num,
+        .mem_block_symbols = ONEWIRE_RMT_RX_MEM_BLOCK_SIZE,
+    };
+    ESP_GOTO_ON_ERROR(rmt_new_rx_channel(&onewire_rx_channel_cfg, &bus_rmt->rx_channel),
+                      err, TAG, "create rmt rx channel failed");
+
+    rmt_tx_channel_config_t onewire_tx_channel_cfg = {
+        .clk_src = RMT_CLK_SRC_DEFAULT,
+        .resolution_hz = ONEWIRE_RMT_RESOLUTION_HZ,
+        .gpio_num = bus_config->bus_gpio_num,
+        .mem_block_symbols = ONEWIRE_RMT_DEFAULT_MEM_BLOCK_SYMBOLS,
+        .trans_queue_depth = ONEWIRE_RMT_DEFAULT_TRANS_QUEUE_SIZE,
+#if ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(6, 0, 0)
+        .flags.io_loop_back = true,
+        .flags.io_od_mode = true,
+#endif
+    };
+    ESP_GOTO_ON_ERROR(rmt_new_tx_channel(&onewire_tx_channel_cfg, &bus_rmt->tx_channel),
+                      err, TAG, "create rmt tx channel failed");
+
+    bus_rmt->data_gpio_num = bus_config->bus_gpio_num;
+#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(6, 0, 0)
+    // enable open-drain mode for 1-wire bus
+    gpio_od_enable(bus_rmt->data_gpio_num);
+#endif
+
+    if (bus_config->flags.en_pull_up) {
+        // enable internal pull-up resistor and disable pull-down resistor
+        gpio_set_pull_mode(bus_rmt->data_gpio_num, GPIO_PULLUP_ONLY);
+    } else {
+        // disable internal pull-up and pull-down resistors
+        gpio_set_pull_mode(bus_rmt->data_gpio_num, GPIO_FLOATING);
+    }
+
+    // allocate rmt rx symbol buffer, one RMT symbol represents one bit, so x8
+    bus_rmt->rx_symbols_buf = malloc(rmt_config->max_rx_bytes * sizeof(rmt_symbol_word_t) * 8);
+    ESP_GOTO_ON_FALSE(bus_rmt->rx_symbols_buf, ESP_ERR_NO_MEM, err, TAG, "no mem to store received RMT symbols");
+    bus_rmt->max_rx_bytes = rmt_config->max_rx_bytes;
+
+    bus_rmt->receive_queue = xQueueCreate(1, sizeof(rmt_rx_done_event_data_t));
+    ESP_GOTO_ON_FALSE(bus_rmt->receive_queue, ESP_ERR_NO_MEM, err, TAG, "receive queue creation failed");
+
+    bus_rmt->bus_mutex = xSemaphoreCreateMutex();
+    ESP_GOTO_ON_FALSE(bus_rmt->bus_mutex, ESP_ERR_NO_MEM, err, TAG, "bus mutex creation failed");
+
+    // register rmt rx done callback
+    rmt_rx_event_callbacks_t cbs = {
+        .on_recv_done = onewire_rmt_rx_done_callback
+    };
+    ESP_GOTO_ON_ERROR(rmt_rx_register_event_callbacks(bus_rmt->rx_channel, &cbs, bus_rmt),
+                      err, TAG, "enable rmt rx channel failed");
+
+    // enable rmt channels
+    ESP_GOTO_ON_ERROR(rmt_enable(bus_rmt->rx_channel), err, TAG, "enable rmt rx channel failed");
+    ESP_GOTO_ON_ERROR(rmt_enable(bus_rmt->tx_channel), err, TAG, "enable rmt tx channel failed");
+
+    // release the bus by sending a special RMT symbol
+    static rmt_symbol_word_t release_symbol = {
+        .level0 = 1,
+        .duration0 = 1,
+        .level1 = 1,
+        .duration1 = 0,
+    };
+    ESP_GOTO_ON_ERROR(rmt_transmit(bus_rmt->tx_channel, bus_rmt->tx_copy_encoder, &release_symbol,
+                                   sizeof(release_symbol), &onewire_rmt_tx_config), err, TAG, "release bus failed");
+
+    bus_rmt->base.del = onewire_bus_rmt_del;
+    bus_rmt->base.reset = onewire_bus_rmt_reset;
+    bus_rmt->base.write_bit = onewire_bus_rmt_write_bit;
+    bus_rmt->base.write_bytes = onewire_bus_rmt_write_bytes;
+    bus_rmt->base.read_bit = onewire_bus_rmt_read_bit;
+    bus_rmt->base.read_bytes = onewire_bus_rmt_read_bytes;
+    *ret_bus = &bus_rmt->base;
+
+    return ret;
+
+err:
+    if (bus_rmt) {
+        onewire_bus_rmt_destroy(bus_rmt);
+    }
+
+    return ret;
+}
+
+static esp_err_t onewire_bus_rmt_destroy(onewire_bus_rmt_obj_t *bus_rmt)
+{
+    if (bus_rmt->tx_bytes_encoder) {
+        rmt_del_encoder(bus_rmt->tx_bytes_encoder);
+    }
+    if (bus_rmt->tx_copy_encoder) {
+        rmt_del_encoder(bus_rmt->tx_copy_encoder);
+    }
+    if (bus_rmt->rx_channel) {
+        rmt_disable(bus_rmt->rx_channel);
+        rmt_del_channel(bus_rmt->rx_channel);
+    }
+    if (bus_rmt->tx_channel) {
+        rmt_disable(bus_rmt->tx_channel);
+        rmt_del_channel(bus_rmt->tx_channel);
+    }
+    if (bus_rmt->receive_queue) {
+        vQueueDelete(bus_rmt->receive_queue);
+    }
+    if (bus_rmt->bus_mutex) {
+        vSemaphoreDelete(bus_rmt->bus_mutex);
+    }
+    if (bus_rmt->rx_symbols_buf) {
+        free(bus_rmt->rx_symbols_buf);
+    }
+#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(6, 0, 0)
+    if (bus_rmt->data_gpio_num != GPIO_NUM_NC) {
+        gpio_od_disable(bus_rmt->data_gpio_num);
+    }
+#endif
+    free(bus_rmt);
+    return ESP_OK;
+}
+
+static esp_err_t onewire_bus_rmt_del(onewire_bus_handle_t bus)
+{
+    onewire_bus_rmt_obj_t *bus_rmt = __containerof(bus, onewire_bus_rmt_obj_t, base);
+    return onewire_bus_rmt_destroy(bus_rmt);
+}
+
+static esp_err_t onewire_bus_rmt_reset(onewire_bus_handle_t bus)
+{
+    onewire_bus_rmt_obj_t *bus_rmt = __containerof(bus, onewire_bus_rmt_obj_t, base);
+    esp_err_t ret = ESP_OK;
+
+    xSemaphoreTake(bus_rmt->bus_mutex, portMAX_DELAY);
+    // send reset pulse while receive presence pulse
+    ESP_GOTO_ON_ERROR(rmt_receive(bus_rmt->rx_channel, bus_rmt->rx_symbols_buf, sizeof(rmt_symbol_word_t) * 2, &onewire_rmt_rx_config),
+                      err, TAG, "1-wire reset pulse receive failed");
+    ESP_GOTO_ON_ERROR(rmt_transmit(bus_rmt->tx_channel, bus_rmt->tx_copy_encoder, &onewire_reset_pulse_symbol, sizeof(onewire_reset_pulse_symbol), &onewire_rmt_tx_config),
+                      err, TAG, "1-wire reset pulse transmit failed");
+
+    // wait and check presence pulse
+    rmt_rx_done_event_data_t rmt_rx_evt_data;
+    ESP_GOTO_ON_FALSE(xQueueReceive(bus_rmt->receive_queue, &rmt_rx_evt_data, pdMS_TO_TICKS(1000)) == pdPASS,
+                      ESP_ERR_TIMEOUT, err, TAG, "1-wire reset pulse receive timeout");
+    if (onewire_rmt_check_presence_pulse(rmt_rx_evt_data.received_symbols, rmt_rx_evt_data.num_symbols) == false) {
+        ret = ESP_ERR_NOT_FOUND;
+    }
+
+err:
+    xSemaphoreGive(bus_rmt->bus_mutex);
+    return ret;
+}
+
+static esp_err_t onewire_bus_rmt_write_bytes(onewire_bus_handle_t bus, const uint8_t *tx_data, uint8_t tx_data_size)
+{
+    onewire_bus_rmt_obj_t *bus_rmt = __containerof(bus, onewire_bus_rmt_obj_t, base);
+    esp_err_t ret = ESP_OK;
+
+    xSemaphoreTake(bus_rmt->bus_mutex, portMAX_DELAY);
+    // transmit data with the bytes encoder
+    ESP_GOTO_ON_ERROR(rmt_transmit(bus_rmt->tx_channel, bus_rmt->tx_bytes_encoder, tx_data, tx_data_size, &onewire_rmt_tx_config),
+                      err, TAG, "1-wire data transmit failed");
+    // wait the transmission to complete
+    ESP_GOTO_ON_ERROR(rmt_tx_wait_all_done(bus_rmt->tx_channel, 50), err, TAG, "wait for 1-wire data transmit failed");
+
+err:
+    xSemaphoreGive(bus_rmt->bus_mutex);
+    return ret;
+}
+
+// While receiving data, we use rmt transmit channel to send 0xFF to generate read pulse,
+// at the same time, receive channel is used to record weather the bus is pulled down by device.
+static esp_err_t onewire_bus_rmt_read_bytes(onewire_bus_handle_t bus, uint8_t *rx_buf, size_t rx_buf_size)
+{
+    onewire_bus_rmt_obj_t *bus_rmt = __containerof(bus, onewire_bus_rmt_obj_t, base);
+    esp_err_t ret = ESP_OK;
+    ESP_RETURN_ON_FALSE(rx_buf_size <= bus_rmt->max_rx_bytes, ESP_ERR_INVALID_ARG, TAG, "rx_buf_size too large for buffer to hold");
+    memset(rx_buf, 0, rx_buf_size);
+
+    xSemaphoreTake(bus_rmt->bus_mutex, portMAX_DELAY);
+
+    // transmit one bits to generate read clock
+    uint8_t tx_buffer[rx_buf_size];
+    memset(tx_buffer, 0xFF, rx_buf_size);
+    // transmit 1 bits while receiving
+    ESP_GOTO_ON_ERROR(rmt_receive(bus_rmt->rx_channel, bus_rmt->rx_symbols_buf, rx_buf_size * 8 * sizeof(rmt_symbol_word_t), &onewire_rmt_rx_config),
+                      err, TAG, "1-wire data receive failed");
+    ESP_GOTO_ON_ERROR(rmt_transmit(bus_rmt->tx_channel, bus_rmt->tx_bytes_encoder, tx_buffer, sizeof(tx_buffer), &onewire_rmt_tx_config),
+                      err, TAG, "1-wire data transmit failed");
+
+    // wait the transmission finishes and decode data
+    rmt_rx_done_event_data_t rmt_rx_evt_data;
+    ESP_GOTO_ON_FALSE(xQueueReceive(bus_rmt->receive_queue, &rmt_rx_evt_data, pdMS_TO_TICKS(1000)) == pdPASS, ESP_ERR_TIMEOUT,
+                      err, TAG, "1-wire data receive timeout");
+    onewire_rmt_decode_data(rmt_rx_evt_data.received_symbols, rmt_rx_evt_data.num_symbols, rx_buf, rx_buf_size);
+
+err:
+    xSemaphoreGive(bus_rmt->bus_mutex);
+    return ret;
+}
+
+static esp_err_t onewire_bus_rmt_write_bit(onewire_bus_handle_t bus, uint8_t tx_bit)
+{
+    onewire_bus_rmt_obj_t *bus_rmt = __containerof(bus, onewire_bus_rmt_obj_t, base);
+    const rmt_symbol_word_t *symbol_to_transmit = tx_bit ? &onewire_bit1_symbol : &onewire_bit0_symbol;
+    esp_err_t ret = ESP_OK;
+
+    xSemaphoreTake(bus_rmt->bus_mutex, portMAX_DELAY);
+
+    // transmit bit
+    ESP_GOTO_ON_ERROR(rmt_transmit(bus_rmt->tx_channel, bus_rmt->tx_copy_encoder, symbol_to_transmit, sizeof(rmt_symbol_word_t), &onewire_rmt_tx_config),
+                      err, TAG, "1-wire bit transmit failed");
+    // wait the transmission to complete
+    ESP_GOTO_ON_ERROR(rmt_tx_wait_all_done(bus_rmt->tx_channel, 50), err, TAG, "wait for 1-wire bit transmit failed");
+
+err:
+    xSemaphoreGive(bus_rmt->bus_mutex);
+    return ret;
+}
+
+static esp_err_t onewire_bus_rmt_read_bit(onewire_bus_handle_t bus, uint8_t *rx_bit)
+{
+    onewire_bus_rmt_obj_t *bus_rmt = __containerof(bus, onewire_bus_rmt_obj_t, base);
+    esp_err_t ret = ESP_OK;
+
+    xSemaphoreTake(bus_rmt->bus_mutex, portMAX_DELAY);
+
+    // transmit 1 bit while receiving
+    ESP_GOTO_ON_ERROR(rmt_receive(bus_rmt->rx_channel, bus_rmt->rx_symbols_buf, sizeof(rmt_symbol_word_t), &onewire_rmt_rx_config),
+                      err, TAG, "1-wire bit receive failed");
+    ESP_GOTO_ON_ERROR(rmt_transmit(bus_rmt->tx_channel, bus_rmt->tx_copy_encoder, &onewire_bit1_symbol, sizeof(rmt_symbol_word_t), &onewire_rmt_tx_config),
+                      err, TAG, "1-wire bit transmit failed");
+
+    // wait the transmission finishes and decode data
+    rmt_rx_done_event_data_t rmt_rx_evt_data;
+    ESP_GOTO_ON_FALSE(xQueueReceive(bus_rmt->receive_queue, &rmt_rx_evt_data, pdMS_TO_TICKS(1000)) == pdPASS, ESP_ERR_TIMEOUT,
+                      err, TAG, "1-wire bit receive timeout");
+    uint8_t rx_buffer = 0;
+    onewire_rmt_decode_data(rmt_rx_evt_data.received_symbols, rmt_rx_evt_data.num_symbols, &rx_buffer, sizeof(rx_buffer));
+    *rx_bit = rx_buffer & 0x01;
+
+err:
+    xSemaphoreGive(bus_rmt->bus_mutex);
+    return ret;
+}

esp32/managed_components/espressif__onewire_bus/src/onewire_bus_impl_uart.c

@@ -0,0 +1,298 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <string.h>
+#include <stdlib.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/semphr.h"
+#include "freertos/task.h"
+#include "esp_check.h"
+#include "driver/uart.h"
+#include "driver/gpio.h"
+#include "onewire_bus_impl_uart.h"
+#include "onewire_bus_interface.h"
+#include "esp_idf_version.h"
+
+static const char *TAG = "1-wire.uart";
+
+#define ONEWIRE_UART_DEFAULT_TIMEOUT_MS    100
+// refer to https://www.analog.com/en/resources/technical-articles/using-a-uart-to-implement-a-1wire-bus-master.html for more information
+#define ONEWIRE_UART_BAUD_RESET            9600   // baud rate for reset pulse and presence detect
+#define ONEWIRE_UART_BAUD_SLOT             115200 // baud rate for read and write operations
+
+#define ONEWIRE_UART_RESET_TX              0xF0 // TX value for reset pulse and presence detect
+#define ONEWIRE_UART_RESET_RX_NO_DEVICE    0xF0 // RX value when no device is present
+
+#define ONEWIRE_UART_SLOT_TX_WRITE_1       0xFF // TX value for write 1
+#define ONEWIRE_UART_SLOT_TX_WRITE_0       0x00 // TX value for write 0
+#define ONEWIRE_UART_SLOT_TX_READ          0xFF // TX value for read
+#define ONEWIRE_UART_SLOT_RX_READ_1        0xFF // RX value when read 1
+
+typedef struct {
+    onewire_bus_t base; /*!< base class */
+    uart_port_t uart_port_num; /*!< UART port number */
+    gpio_num_t data_gpio_num; /*!< GPIO number for 1-wire bus */
+    uint32_t current_baud_rate; /*!< Note: the baud rate returned by uart_get_baudrate() could have a slight deviation from the user-configured baud rate.
+                                     That's why we store the configured baud rate here. */
+    SemaphoreHandle_t bus_mutex;
+} onewire_bus_uart_obj_t;
+
+static esp_err_t onewire_bus_uart_read_bit(onewire_bus_handle_t bus, uint8_t *rx_bit);
+static esp_err_t onewire_bus_uart_write_bit(onewire_bus_handle_t bus, uint8_t tx_bit);
+static esp_err_t onewire_bus_uart_read_bytes(onewire_bus_handle_t bus, uint8_t *rx_buf, size_t rx_buf_size);
+static esp_err_t onewire_bus_uart_write_bytes(onewire_bus_handle_t bus, const uint8_t *tx_data, uint8_t tx_data_size);
+static esp_err_t onewire_bus_uart_reset(onewire_bus_handle_t bus);
+static esp_err_t onewire_bus_uart_del(onewire_bus_handle_t bus);
+
+static esp_err_t onewire_bus_uart_destroy(onewire_bus_uart_obj_t *bus_uart);
+static esp_err_t onewire_bus_uart_set_baud_rate(onewire_bus_uart_obj_t *bus_uart, uint32_t baud_rate);
+static esp_err_t onewire_bus_uart_exchange_byte(onewire_bus_uart_obj_t *bus_uart, uint8_t tx_data, uint8_t *rx_data);
+static esp_err_t onewire_bus_uart_write_bit_nolock(onewire_bus_uart_obj_t *bus_uart, uint8_t tx_bit);
+static esp_err_t onewire_bus_uart_read_bit_nolock(onewire_bus_uart_obj_t *bus_uart, uint8_t *rx_bit);
+
+esp_err_t onewire_new_bus_uart(const onewire_bus_config_t *bus_config, const onewire_bus_uart_config_t *uart_config, onewire_bus_handle_t *ret_bus)
+{
+    esp_err_t ret = ESP_OK;
+    onewire_bus_uart_obj_t *bus_uart = NULL;
+    ESP_RETURN_ON_FALSE(bus_config && uart_config && ret_bus, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+    ESP_RETURN_ON_FALSE(GPIO_IS_VALID_OUTPUT_GPIO(bus_config->bus_gpio_num), ESP_ERR_INVALID_ARG, TAG, "invalid GPIO number");
+
+    bus_uart = calloc(1, sizeof(onewire_bus_uart_obj_t));
+    ESP_RETURN_ON_FALSE(bus_uart, ESP_ERR_NO_MEM, TAG, "no mem for onewire_bus_uart_obj_t");
+    bus_uart->uart_port_num = UART_NUM_MAX;
+    bus_uart->data_gpio_num = GPIO_NUM_NC;
+
+    const gpio_config_t io_conf = {
+        .pin_bit_mask = (1ULL << bus_config->bus_gpio_num),
+        .mode = GPIO_MODE_INPUT_OUTPUT_OD,
+        .pull_up_en = bus_config->flags.en_pull_up ? GPIO_PULLUP_ENABLE : GPIO_PULLUP_DISABLE,
+        .pull_down_en = GPIO_PULLDOWN_DISABLE,
+        .intr_type = GPIO_INTR_DISABLE,
+    };
+    ESP_GOTO_ON_ERROR(gpio_config(&io_conf), err, TAG, "gpio config failed");
+    bus_uart->data_gpio_num = bus_config->bus_gpio_num;
+
+    // Simulate a 1-Wire bus using UART 8N1 mode
+    // refer to https://www.analog.com/en/resources/technical-articles/using-a-uart-to-implement-a-1wire-bus-master.html for more information
+    const uart_config_t uart_cfg = {
+        .baud_rate = ONEWIRE_UART_BAUD_RESET,
+        .data_bits = UART_DATA_8_BITS,
+        .parity = UART_PARITY_DISABLE,
+        .stop_bits = UART_STOP_BITS_1,
+        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
+        .source_clk = UART_SCLK_DEFAULT,
+    };
+    ESP_GOTO_ON_ERROR(uart_param_config(uart_config->uart_port_num, &uart_cfg), err, TAG, "uart param config failed");
+    bus_uart->current_baud_rate = uart_cfg.baud_rate;
+    ESP_GOTO_ON_ERROR(uart_set_pin(uart_config->uart_port_num, bus_config->bus_gpio_num, bus_config->bus_gpio_num, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE),
+                      err, TAG, "uart set pin failed");
+#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 2, 0)
+    // Set the RX buffer to minimum size because we only need to receive 1 byte at a time
+    // Disable the TX buffer because we only need to send 1 byte at a time
+    ESP_GOTO_ON_ERROR(uart_driver_install(uart_config->uart_port_num, UART_HW_FIFO_LEN(uart_config->uart_port_num) + 1, 0, 0, NULL, 0),
+                      err, TAG, "uart driver install failed");
+#else
+    ESP_GOTO_ON_ERROR(uart_driver_install(uart_config->uart_port_num, UART_FIFO_LEN + 1, 0, 0, NULL, 0),
+                      err, TAG, "uart driver install failed");
+#endif
+    bus_uart->uart_port_num = uart_config->uart_port_num;
+
+    // Configuration optimized for this scenario
+    // We only need to receive 1 byte at a time, so set the rx full threshold to 1 for faster response
+    // Normally, the RX timeout interrupt is not expected to trigger. Setting the timeout to 1 here is simply to ensure a fast response
+    ESP_GOTO_ON_ERROR(uart_set_rx_full_threshold(uart_config->uart_port_num, 1), err, TAG, "uart set rx full threshold failed");
+    ESP_GOTO_ON_ERROR(uart_set_rx_timeout(uart_config->uart_port_num, 1), err, TAG, "uart set rx timeout failed");
+
+    bus_uart->bus_mutex = xSemaphoreCreateMutex();
+    ESP_GOTO_ON_FALSE(bus_uart->bus_mutex, ESP_ERR_NO_MEM, err, TAG, "bus mutex creation failed");
+
+    bus_uart->base.del = onewire_bus_uart_del;
+    bus_uart->base.reset = onewire_bus_uart_reset;
+    bus_uart->base.write_bit = onewire_bus_uart_write_bit;
+    bus_uart->base.write_bytes = onewire_bus_uart_write_bytes;
+    bus_uart->base.read_bit = onewire_bus_uart_read_bit;
+    bus_uart->base.read_bytes = onewire_bus_uart_read_bytes;
+    *ret_bus = &bus_uart->base;
+    return ret;
+
+err:
+    if (bus_uart) {
+        onewire_bus_uart_destroy(bus_uart);
+    }
+    return ret;
+}
+
+static esp_err_t onewire_bus_uart_destroy(onewire_bus_uart_obj_t *bus_uart)
+{
+    if (bus_uart->bus_mutex) {
+        vSemaphoreDelete(bus_uart->bus_mutex);
+    }
+    if (bus_uart->uart_port_num != UART_NUM_MAX) {
+        uart_driver_delete(bus_uart->uart_port_num);
+    }
+    if (bus_uart->data_gpio_num != GPIO_NUM_NC) {
+        gpio_reset_pin(bus_uart->data_gpio_num);
+    }
+    free(bus_uart);
+    return ESP_OK;
+}
+
+static esp_err_t onewire_bus_uart_set_baud_rate(onewire_bus_uart_obj_t *bus_uart, uint32_t baud_rate)
+{
+    if (bus_uart->current_baud_rate == baud_rate) {
+        return ESP_OK;
+    }
+    esp_err_t ret = uart_set_baudrate(bus_uart->uart_port_num, baud_rate);
+    if (ret != ESP_OK) {
+        return ret;
+    }
+    bus_uart->current_baud_rate = baud_rate;
+    return ESP_OK;
+}
+
+/**
+ * @brief Send and receive one byte over the UART bus.
+ *
+ * @note This function is used for:
+ *   - reset pulse and presence detect
+ *   - write or read one bit on the 1-wire bus
+ */
+static esp_err_t onewire_bus_uart_exchange_byte(onewire_bus_uart_obj_t *bus_uart, uint8_t tx_data, uint8_t *rx_data)
+{
+    esp_err_t ret = uart_flush_input(bus_uart->uart_port_num);
+    if (ret != ESP_OK) {
+        return ret;
+    }
+    if (uart_tx_chars(bus_uart->uart_port_num, (const char *)&tx_data, 1) != 1) {
+        return ESP_FAIL;
+    }
+    if (uart_read_bytes(bus_uart->uart_port_num, rx_data, 1, pdMS_TO_TICKS(ONEWIRE_UART_DEFAULT_TIMEOUT_MS)) != 1) {
+        return ESP_ERR_TIMEOUT;
+    }
+    return ESP_OK;
+}
+
+static esp_err_t onewire_bus_uart_write_bit_nolock(onewire_bus_uart_obj_t *bus_uart, uint8_t tx_bit)
+{
+    uint8_t rx_data = 0;
+    const uint8_t tx_data = tx_bit ? ONEWIRE_UART_SLOT_TX_WRITE_1 : ONEWIRE_UART_SLOT_TX_WRITE_0;
+    esp_err_t ret = onewire_bus_uart_exchange_byte(bus_uart, tx_data, &rx_data);
+    if (ret != ESP_OK) {
+        return ret;
+    }
+    return (rx_data == tx_data) ? ESP_OK : ESP_ERR_INVALID_STATE;   // Check if the sent data is corrupted
+}
+
+static esp_err_t onewire_bus_uart_read_bit_nolock(onewire_bus_uart_obj_t *bus_uart, uint8_t *rx_bit)
+{
+    uint8_t rx_data = 0;
+    esp_err_t ret = onewire_bus_uart_exchange_byte(bus_uart, ONEWIRE_UART_SLOT_TX_READ, &rx_data);
+    if (ret != ESP_OK) {
+        return ret;
+    }
+    *rx_bit = (rx_data == ONEWIRE_UART_SLOT_RX_READ_1) ? 1 : 0;
+    return ESP_OK;
+}
+
+////////////////////////////// implementation of onewire_bus_t functions //////////////////////////////
+
+static esp_err_t onewire_bus_uart_del(onewire_bus_handle_t bus)
+{
+    onewire_bus_uart_obj_t *bus_uart = __containerof(bus, onewire_bus_uart_obj_t, base);
+    return onewire_bus_uart_destroy(bus_uart);
+}
+
+static esp_err_t onewire_bus_uart_reset(onewire_bus_handle_t bus)
+{
+    onewire_bus_uart_obj_t *bus_uart = __containerof(bus, onewire_bus_uart_obj_t, base);
+    esp_err_t ret = ESP_OK;
+    uint8_t rx_data = 0;
+
+    xSemaphoreTake(bus_uart->bus_mutex, portMAX_DELAY);
+    ESP_GOTO_ON_ERROR(onewire_bus_uart_set_baud_rate(bus_uart, ONEWIRE_UART_BAUD_RESET), err, TAG, "set reset baudrate failed");
+    ESP_GOTO_ON_ERROR(onewire_bus_uart_exchange_byte(bus_uart, ONEWIRE_UART_RESET_TX, &rx_data), err, TAG, "create reset pulse failed");
+    ESP_GOTO_ON_FALSE(rx_data != ONEWIRE_UART_RESET_RX_NO_DEVICE, ESP_ERR_NOT_FOUND, err, TAG, "no 1-wire device found");
+
+err:
+    xSemaphoreGive(bus_uart->bus_mutex);
+    return ret;
+}
+
+static esp_err_t onewire_bus_uart_write_bytes(onewire_bus_handle_t bus, const uint8_t *tx_data, uint8_t tx_data_size)
+{
+    onewire_bus_uart_obj_t *bus_uart = __containerof(bus, onewire_bus_uart_obj_t, base);
+    esp_err_t ret = ESP_OK;
+
+    ESP_RETURN_ON_FALSE(tx_data && tx_data_size, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+    xSemaphoreTake(bus_uart->bus_mutex, portMAX_DELAY);
+    ESP_GOTO_ON_ERROR(onewire_bus_uart_set_baud_rate(bus_uart, ONEWIRE_UART_BAUD_SLOT), err, TAG, "set slot baudrate failed");
+
+    for (uint8_t i = 0; i < tx_data_size; i++) {
+        uint8_t current = tx_data[i];
+        for (int bit = 0; bit < 8; bit++) {
+            ESP_GOTO_ON_ERROR(onewire_bus_uart_write_bit_nolock(bus_uart, current & 0x01), err, TAG, "write bit failed");
+            current >>= 1;
+        }
+    }
+
+err:
+    xSemaphoreGive(bus_uart->bus_mutex);
+    return ret;
+}
+
+static esp_err_t onewire_bus_uart_read_bytes(onewire_bus_handle_t bus, uint8_t *rx_buf, size_t rx_buf_size)
+{
+    onewire_bus_uart_obj_t *bus_uart = __containerof(bus, onewire_bus_uart_obj_t, base);
+    esp_err_t ret = ESP_OK;
+
+    ESP_RETURN_ON_FALSE(rx_buf && rx_buf_size, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+    memset(rx_buf, 0, rx_buf_size);
+    xSemaphoreTake(bus_uart->bus_mutex, portMAX_DELAY);
+    ESP_GOTO_ON_ERROR(onewire_bus_uart_set_baud_rate(bus_uart, ONEWIRE_UART_BAUD_SLOT), err, TAG, "set slot baudrate failed");
+
+    for (size_t i = 0; i < rx_buf_size; i++) {
+        uint8_t current = 0;
+        for (int bit = 0; bit < 8; bit++) {
+            uint8_t rx_bit = 0;
+            ESP_GOTO_ON_ERROR(onewire_bus_uart_read_bit_nolock(bus_uart, &rx_bit), err, TAG, "read bit failed");
+            if (rx_bit) {
+                current |= (1 << bit);
+            }
+        }
+        rx_buf[i] = current;
+    }
+
+err:
+    xSemaphoreGive(bus_uart->bus_mutex);
+    return ret;
+}
+
+static esp_err_t onewire_bus_uart_write_bit(onewire_bus_handle_t bus, uint8_t tx_bit)
+{
+    onewire_bus_uart_obj_t *bus_uart = __containerof(bus, onewire_bus_uart_obj_t, base);
+    esp_err_t ret = ESP_OK;
+
+    xSemaphoreTake(bus_uart->bus_mutex, portMAX_DELAY);
+    ESP_GOTO_ON_ERROR(onewire_bus_uart_set_baud_rate(bus_uart, ONEWIRE_UART_BAUD_SLOT), err, TAG, "set slot baudrate failed");
+    ESP_GOTO_ON_ERROR(onewire_bus_uart_write_bit_nolock(bus_uart, tx_bit), err, TAG, "write bit failed");
+err:
+    xSemaphoreGive(bus_uart->bus_mutex);
+    return ret;
+}
+
+static esp_err_t onewire_bus_uart_read_bit(onewire_bus_handle_t bus, uint8_t *rx_bit)
+{
+    onewire_bus_uart_obj_t *bus_uart = __containerof(bus, onewire_bus_uart_obj_t, base);
+    ESP_RETURN_ON_FALSE(rx_bit, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+    esp_err_t ret = ESP_OK;
+
+    xSemaphoreTake(bus_uart->bus_mutex, portMAX_DELAY);
+    ESP_GOTO_ON_ERROR(onewire_bus_uart_set_baud_rate(bus_uart, ONEWIRE_UART_BAUD_SLOT), err, TAG, "set slot baudrate failed");
+    ESP_GOTO_ON_ERROR(onewire_bus_uart_read_bit_nolock(bus_uart, rx_bit), err, TAG, "read bit failed");
+err:
+    xSemaphoreGive(bus_uart->bus_mutex);
+    return ret;
+}
+

esp32/managed_components/espressif__onewire_bus/src/onewire_crc.c

@@ -0,0 +1,60 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "onewire_crc.h"
+
+#define FAST_CRC 1 // define this to use the fast CRC table
+
+#if FAST_CRC
+
+static const uint8_t dalas_crc8_table[] = {
+    0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
+    157, 195, 33, 127, 252, 162, 64, 30, 95,  1, 227, 189, 62, 96, 130, 220,
+    35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93,  3, 128, 222, 60, 98,
+    190, 224,  2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
+    70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89,  7,
+    219, 133, 103, 57, 186, 228,  6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
+    101, 59, 217, 135,  4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
+    248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91,  5, 231, 185,
+    140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
+    17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
+    175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
+    50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
+    202, 148, 118, 40, 171, 245, 23, 73,  8, 86, 180, 234, 105, 55, 213, 139,
+    87,  9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
+    233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
+    116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53
+};
+
+uint8_t onewire_crc8(uint8_t init_crc, uint8_t *input, size_t input_size)
+{
+    uint8_t crc = init_crc;
+    for (size_t i = 0; i < input_size; i ++) {
+        crc = dalas_crc8_table[crc ^ input[i]];
+    }
+    return crc;
+}
+
+#else // FAST_CRC
+
+uint8_t onewire_crc8(uint8_t init_crc, uint8_t *input, size_t input_size)
+{
+    uint8_t crc = init_crc;
+    for (size_t i = 0; i < input_size; i++) {
+        uint8_t byte = input[i];
+        for (int j = 0; j < 8; j++) {
+            uint8_t x = (byte ^ crc) & 0x01;
+            crc >>= 1;
+            if (x != 0) {
+                crc ^= 0x8C;
+            }
+            byte >>= 1;
+        }
+    }
+    return crc;
+}
+
+#endif // FAST_CRC

esp32/managed_components/espressif__onewire_bus/src/onewire_device.c

@@ -0,0 +1,124 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <string.h>
+#include <stdbool.h>
+#include "esp_check.h"
+#include "esp_log.h"
+#include "onewire_bus.h"
+#include "onewire_device.h"
+#include "onewire_crc.h"
+#include "onewire_cmd.h"
+
+static const char *TAG = "1-wire.device";
+
+typedef struct onewire_device_iter_t {
+    onewire_bus_handle_t bus;
+    uint16_t last_discrepancy;
+    bool is_last_device;
+    uint8_t rom_number[sizeof(onewire_device_address_t)];
+} onewire_device_iter_t;
+
+esp_err_t onewire_new_device_iter(onewire_bus_handle_t bus, onewire_device_iter_handle_t *ret_iter)
+{
+    ESP_RETURN_ON_FALSE(bus && ret_iter, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+
+    onewire_device_iter_t *iter = calloc(1, sizeof(onewire_device_iter_t));
+    ESP_RETURN_ON_FALSE(iter, ESP_ERR_NO_MEM, TAG, "no mem for device iterator");
+
+    iter->bus = bus;
+    *ret_iter = iter;
+
+    return ESP_OK;
+}
+
+esp_err_t onewire_del_device_iter(onewire_device_iter_handle_t iter)
+{
+    ESP_RETURN_ON_FALSE(iter, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+
+    free(iter);
+
+    return ESP_OK;
+}
+
+// Search algorithm inspired by https://www.analog.com/en/app-notes/1wire-search-algorithm.html
+esp_err_t onewire_device_iter_get_next(onewire_device_iter_handle_t iter, onewire_device_t *dev)
+{
+    ESP_RETURN_ON_FALSE(iter && dev, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
+    // we don't treat iterator ending and ESP_ERR_NOT_FOUND as an error condition, so just print debug message here
+    if (iter->is_last_device) {
+        ESP_LOGD(TAG, "1-wire rom search finished");
+        return ESP_ERR_NOT_FOUND;
+    }
+    onewire_bus_handle_t bus = iter->bus;
+    esp_err_t reset_result = onewire_bus_reset(bus);
+    if (reset_result == ESP_ERR_NOT_FOUND) {
+        ESP_LOGW(TAG, "reset bus failed: no devices found");
+        return ESP_ERR_NOT_FOUND;
+    }
+    ESP_RETURN_ON_ERROR(reset_result, TAG, "reset bus failed");
+
+    // send rom search command and start search algorithm
+    ESP_RETURN_ON_ERROR(onewire_bus_write_bytes(bus, (uint8_t[]) {
+        ONEWIRE_CMD_SEARCH_NORMAL
+    }, 1), TAG, "send ONEWIRE_CMD_SEARCH_NORMAL failed");
+
+    uint8_t last_zero = 0;
+    for (uint16_t rom_bit_index = 0; rom_bit_index < sizeof(onewire_device_address_t) * 8; rom_bit_index ++) {
+        uint8_t rom_byte_index = rom_bit_index / 8;
+        uint8_t rom_bit_mask = 1 << (rom_bit_index % 8); // calculate byte index and bit mask in advance for convenience
+
+        uint8_t rom_bit = 0;
+        uint8_t rom_bit_complement = 0;
+        ESP_RETURN_ON_ERROR(onewire_bus_read_bit(bus, &rom_bit), TAG, "read rom_bit error"); // write 1 bit to read from the bus
+        ESP_RETURN_ON_ERROR(onewire_bus_read_bit(bus, &rom_bit_complement), TAG, "read rom_bit_complement error"); // read a bit and its complement
+
+        // No devices participating in search.
+        if (rom_bit && rom_bit_complement) {
+            ESP_LOGE(TAG, "no devices participating in search");
+            return ESP_ERR_NOT_FOUND;
+        }
+
+        uint8_t search_direction;
+        if (rom_bit != rom_bit_complement) { // There are only 0s or 1s in the bit of the participating ROM numbers.
+            search_direction = rom_bit;  // just go ahead
+        } else { // There are both 0s and 1s in the current bit position of the participating ROM numbers. This is a discrepancy.
+            if (rom_bit_index < iter->last_discrepancy) { // current id bit is before the last discrepancy bit
+                search_direction = (iter->rom_number[rom_byte_index] & rom_bit_mask) ? 0x01 : 0x00; // follow previous way
+            } else {
+                search_direction = (rom_bit_index == iter->last_discrepancy) ? 0x01 : 0x00; // search for 0 bit first
+            }
+
+            if (search_direction == 0) { // record zero's position in last zero
+                last_zero = rom_bit_index;
+            }
+        }
+
+        if (search_direction == 1) { // set corresponding rom bit by search direction
+            iter->rom_number[rom_byte_index] |= rom_bit_mask;
+        } else {
+            iter->rom_number[rom_byte_index] &= ~rom_bit_mask;
+        }
+
+        // set search direction
+        ESP_RETURN_ON_ERROR(onewire_bus_write_bit(bus, search_direction), TAG, "write direction bit error");
+    }
+
+    // if the search was successful
+    iter->last_discrepancy = last_zero;
+    if (iter->last_discrepancy == 0) { // last zero loops back to the first bit
+        iter->is_last_device = true;
+    }
+
+    // check crc
+    ESP_RETURN_ON_FALSE(onewire_crc8(0, iter->rom_number, 7) == iter->rom_number[7], ESP_ERR_INVALID_CRC, TAG, "bad device crc");
+
+    // save the ROM number as the device address
+    memcpy(&dev->address, iter->rom_number, sizeof(onewire_device_address_t));
+    dev->bus = bus;
+    ESP_LOGD(TAG, "new 1-Wire device found, address: %016llX", dev->address);
+
+    return ESP_OK;
+}

esp32/managed_components/espressif__onewire_bus/test_apps/CMakeLists.txt

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+set(COMPONENTS main)
+project(onewire_bus_test)

esp32/managed_components/espressif__onewire_bus/test_apps/main/CMakeLists.txt

@@ -0,0 +1,3 @@
+idf_component_register(SRCS "onewire_bus_test.c"
+                    INCLUDE_DIRS "."
+                    PRIV_REQUIRES unity)

esp32/managed_components/espressif__onewire_bus/test_apps/main/Kconfig.projbuild

@@ -0,0 +1,53 @@
+menu "Example Configuration"
+
+    choice EXAMPLE_ONEWIRE_BACKEND
+        prompt "1-Wire backend"
+        default EXAMPLE_ONEWIRE_BACKEND_RMT if SOC_RMT_SUPPORTED
+        default EXAMPLE_ONEWIRE_BACKEND_UART if SOC_UART_SUPPORTED
+        help
+            Select which low-level backend the test app uses.
+
+        config EXAMPLE_ONEWIRE_BACKEND_RMT
+            bool "RMT backend"
+            depends on SOC_RMT_SUPPORTED
+
+        config EXAMPLE_ONEWIRE_BACKEND_UART
+            bool "UART backend"
+            depends on SOC_UART_SUPPORTED
+    endchoice
+
+    config EXAMPLE_ONEWIRE_UART_PORT_NUM
+        int "UART port number"
+        depends on EXAMPLE_ONEWIRE_BACKEND_UART
+        default 1
+        range 0 2
+        help
+            UART port used by UART backend.
+            Valid UART port numbers differ across targets.
+            Note: UART0 is typically used by the console output.
+
+    config EXAMPLE_ONEWIRE_BUS_GPIO
+        int "1-Wire data GPIO"
+        default 0
+        range 0 63
+        help
+            GPIO number used for the 1-Wire data line.
+            Valid GPIO numbers depend on the selected target; choose a
+            data-capable GPIO within this range for your chip.
+
+    config EXAMPLE_ONEWIRE_ENABLE_INTERNAL_PULLUP
+        bool "Enable internal pull-up"
+        default y
+        help
+            Enable internal pull-up resistor on the GPIO pin used for the 1-Wire data line.
+            This is useful when no external pull-up resistor is present.
+
+    config EXAMPLE_ONEWIRE_MAX_DEVICES
+        int "Maximum devices to search"
+        default 2
+        range 1 64
+        help
+            Maximum number of devices to search on the 1-Wire bus.
+            This test app performs SEARCH ROM to collect device addresses (64-bit ROM IDs).
+
+endmenu

esp32/managed_components/espressif__onewire_bus/test_apps/main/idf_component.yml

@@ -0,0 +1,4 @@
+dependencies:
+  espressif/onewire_bus:
+    version: "*"
+    override_path: "../.."

esp32/managed_components/espressif__onewire_bus/test_apps/main/onewire_bus_test.c

@@ -0,0 +1,80 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include "esp_log.h"
+#include "esp_check.h"
+#include "sdkconfig.h"
+#include "onewire_bus.h"
+#include "onewire_device.h"
+
+static const char *TAG = "test-app";
+
+#if CONFIG_EXAMPLE_ONEWIRE_ENABLE_INTERNAL_PULLUP
+#define EXAMPLE_ONEWIRE_ENABLE_INTERNAL_PULLUP 1
+#else
+#define EXAMPLE_ONEWIRE_ENABLE_INTERNAL_PULLUP 0
+#endif
+
+#if CONFIG_EXAMPLE_ONEWIRE_BACKEND_UART
+#define EXAMPLE_ONEWIRE_UART_PORT_NUM CONFIG_EXAMPLE_ONEWIRE_UART_PORT_NUM
+#endif
+
+#define EXAMPLE_ONEWIRE_BUS_GPIO     CONFIG_EXAMPLE_ONEWIRE_BUS_GPIO
+#define EXAMPLE_ONEWIRE_MAX_DEVICES  CONFIG_EXAMPLE_ONEWIRE_MAX_DEVICES
+
+void app_main(void)
+{
+    // install new 1-wire bus
+    onewire_bus_handle_t bus;
+    onewire_bus_config_t bus_config = {
+        .bus_gpio_num = EXAMPLE_ONEWIRE_BUS_GPIO,
+        .flags = {
+            .en_pull_up = EXAMPLE_ONEWIRE_ENABLE_INTERNAL_PULLUP,
+        }
+    };
+#if CONFIG_EXAMPLE_ONEWIRE_BACKEND_RMT
+    onewire_bus_rmt_config_t rmt_config = {
+        .max_rx_bytes = 10, // 1byte ROM command + 8byte ROM number + 1byte device command
+    };
+    ESP_ERROR_CHECK(onewire_new_bus_rmt(&bus_config, &rmt_config, &bus));
+    ESP_LOGI(TAG, "1-Wire bus installed on GPIO%d by RMT backend", EXAMPLE_ONEWIRE_BUS_GPIO);
+#elif CONFIG_EXAMPLE_ONEWIRE_BACKEND_UART
+    onewire_bus_uart_config_t uart_config = {
+        .uart_port_num = EXAMPLE_ONEWIRE_UART_PORT_NUM,
+    };
+    ESP_ERROR_CHECK(onewire_new_bus_uart(&bus_config, &uart_config, &bus));
+    ESP_LOGI(TAG, "1-Wire bus installed on GPIO%d by UART backend (UART%d)",
+             EXAMPLE_ONEWIRE_BUS_GPIO, EXAMPLE_ONEWIRE_UART_PORT_NUM);
+#else
+#error "No 1-Wire backend selected in menuconfig"
+#endif
+
+    int onewire_device_found = 0;
+    onewire_device_iter_handle_t iter = NULL;
+    onewire_device_t next_onewire_device;
+    esp_err_t search_result = ESP_OK;
+
+    // create 1-wire device iterator, which is used for device search
+    ESP_ERROR_CHECK(onewire_new_device_iter(bus, &iter));
+    ESP_LOGI(TAG, "Device iterator created, start searching...");
+    do {
+        search_result = onewire_device_iter_get_next(iter, &next_onewire_device);
+        // found a new device
+        if (search_result == ESP_OK) {
+            ESP_LOGI(TAG, "Found a new device, address: %016llX", next_onewire_device.address);
+            onewire_device_found++;
+            if (onewire_device_found >= EXAMPLE_ONEWIRE_MAX_DEVICES) {
+                ESP_LOGI(TAG, "Max device number reached, stop searching...");
+                break;
+            }
+        }
+    } while (search_result != ESP_ERR_NOT_FOUND);
+    ESP_ERROR_CHECK(onewire_del_device_iter(iter));
+    ESP_LOGI(TAG, "Searching done, %d device(s) found", onewire_device_found);
+
+    // delete the bus
+    ESP_LOGI(TAG, "Deleting bus...");
+    ESP_ERROR_CHECK(onewire_bus_del(bus));
+}

esp32/managed_components/espressif__onewire_bus/test_apps/pytest_onewire_bus.py

@@ -0,0 +1,16 @@
+# SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Unlicense OR CC0-1.0
+import pytest
+from pytest_embedded import Dut
+
+@pytest.mark.generic
+@pytest.mark.parametrize('config', ['rmt', 'uart'], indirect=True)
+def test_onewire_bus(dut: Dut, config: str) -> None:
+    if config == 'rmt':
+        dut.expect_exact('test-app: 1-Wire bus installed on GPIO0 by RMT backend')
+    elif config == 'uart':
+        dut.expect_exact('test-app: 1-Wire bus installed on GPIO0 by UART backend (UART1)')
+    else:
+        raise ValueError(f'Unknown test config: {config}')
+    dut.expect_exact('test-app: Device iterator created, start searching')
+    dut.expect_exact('test-app: Searching done')

esp32/partitions.csv

@@ -0,0 +1,7 @@
+# Name,     Type, SubType, Offset,   Size
+nvs,        data, nvs,     0x9000,   0x5000
+otadata,    data, ota,     0xe000,   0x2000
+phy_init,   data, phy,     0x10000,  0x1000
+
+ota_0,      app,  ota_0,   0x20000,  0x140000
+ota_1,      app,  ota_1,   0x160000, 0x140000

esp32/version.txt

@@ -0,0 +1 @@
+1