Add esp32s2 support

esp32/main/protocol.h

@@ -1,18 +1,36 @@
 #pragma once
-#include "cJSON.h"
-#include <string>
 
-struct ProtocolMessage {
-    int v;
-    std::string id;
-    std::string type;
-    uint64_t ts;
-    std::string deviceId; // C++ строка
-    cJSON* payload;
-};
+#include <stdint.h>
+#include <stddef.h>
 
-// Создание JSON из структуры
-cJSON* protocol_message_to_json(const ProtocolMessage *msg);
+#ifdef __cplusplus
+extern "C" {
+#endif
 
-// Разбор JSON в структуру
-int protocol_json_to_message(const char *json_str, ProtocolMessage *msg);
+int build_telemetry_single(
+    char* buf,
+    size_t buf_size,
+    const char* id,
+    const char* device_id,
+    int64_t ts_ms,
+    const char* metric,
+    double value,
+    const char* unit,     // optional (NULL)
+    const char* source,   // optional (NULL)
+    int64_t m_ts_ms       // optional (0 = нет)
+);
+
+int build_event(
+    char* buf,
+    size_t buf_size,
+    const char* id,
+    const char* device_id,
+    int64_t ts_ms,
+    const char* name,
+    const char* severity, // optional
+    const char* message   // optional
+);
+
+#ifdef __cplusplus
+}
+#endif