ustccw
commented
3 years ago @Nicrus86 please take a look about some AT+MQTT examples:
- AWS broker: https://blog.csdn.net/espressif/article/details/105045610
- Azure IoT: https://blog.csdn.net/espressif/article/details/103736743
- QCloud MQTT broker: https://blog.csdn.net/espressif/article/details/104714464
- Alibaba MQTT broker: https://blog.csdn.net/espressif/article/details/107367189
You can capture the packets to analysis why the MQTT Subscribe failed
I use the board 'ESP32 NodeMCU DevKit C v4' and I flashed it using the following firmware 'ESP32-WROOM-32_AT_Bin_V2.1.0.0' (http://download.espressif.com/esp_at/firmware/ESP32/ESP32_WROOM/ESP32-WROOM-32_AT_Bin_V2.1.0.0.zip ). I use a Beaglebone Enhanced to run AT commands throught serial port UART1. I have an issues with the AT commands for MQTT connection; in particular when I try to subscribe to a topic of my IoT platform Thingsboard. In the following there is the sequence of MQTT commands used.
[1] User configuration AT+MQTTUSERCFG=0,1,"ESP32_module",<"ACCESS TOKEN of IoT device">,"",0,0,""
OK
[2] Connection configuration AT+MQTTCONNCFG=0,60,0,"lwt_topic","lwt_message",1,0
OK
[3] Connect to the platform AT+MQTTCONN=0,"thingsboard.iotprojects.eu",9082,0
+MQTTCONNECTED:0,1,"thingsboard.iotprojects.eu","9082","",0
OK
[4] Check connection AT+MQTTCONN? +MQTTCONN:0,4,1,"thingsboard.iotprojects.eu","9082","",0
OK
[5] Subscribe to topic AT+MQTTSUB=0,"v1/devices/me/telemetry",1 +MQTTDISCONNECTED:0
ERROR
The assumptions that I have done are: (following the guide ==> https://docs.espressif.com/projects/esp-at/en/latest/AT_Command_Set/MQTT_AT_Commands.html) ===== [1] User configuration =====
I need to understand if my configuration is wrong and/or if some parameters of AT commands above indicates is wrong. If there is anyone who has already worked with the AT commands of the ESP32, please share me some examples to understand better how work it.