Initial commit: CCU621_M firmware project with BLE debug link support.

Co-authored-by: Cursor <cursoragent@cursor.com>

Third_party/sdkEng/dev_model/dm_client_adapter.h

@@ -0,0 +1,18 @@
+#ifndef _DM_CLIENT_ADAPTER_H_
+#define _DM_CLIENT_ADAPTER_H_
+
+typedef struct {
+    int fd;
+    void *callback;
+} dm_client_ctx_t;
+
+int dm_client_open(void);
+int dm_client_connect(int timeout_ms);
+int dm_client_close(void);
+int dm_client_subscribe(char *uri, iotx_cm_data_handle_cb callback, void *context);
+int dm_client_unsubscribe(char *uri);
+int dm_client_publish(char *uri, unsigned char *payload, int payload_len, iotx_cm_data_handle_cb callback);
+int dm_client_yield(unsigned int timeout);
+void dm_client_user_sub_request(int fd, const char *topic, const char *payload, unsigned int payload_len,
+                                void *context);
+#endif