It is not recommend that use esp-tls component directly. You can use tcp_transport component API to create TCP/TLS connection which like esp_http_client component logic.

What IDF version you used.

In short, remember that if the wifi is already connected, calling esp_wifi_connect() will not reconnect.

Yes, we supporrt mqtts. It will encrypt mqtt packet.

You can remove esp_wifi_disconnect() in function wifi_prov_mgr_start_provisioning() and add esp_wifi_disconnect() in function wifi_connect_timer_cb(),before the esp_wifi_connect().

You can change code from COAP_REQUEST_GET to COAP_REQUEST_POST. https://github.com/espressif/esp-idf/bl ... ain.c#L134

Okay, could you offer the sdkconfig and the *.elf，which i can disassembled the code.

Could you please offer your project code and reproduce step for me and i can reproduce it on my own environment. Could you please also offer the sdkconfig file and the *.elf file corresponding to your crash.

很抱歉没有，基于 UDP 之上实现的心跳并不是标准的协议，每个用户可以自行设计，所以我们没有这个参考资料。而且一般对于这种使用场景，我们会优先考虑已有的 TCP 协议。

我感觉心跳包是最简单的，一问一答，如果不回答，就认为断开连接了。主要就是发数据给对端，对端不回就认为断开连接了。