LWIP MQTT not connecting

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Sébastien Trocherie
评论： Youssef Amir 2024-5-2
Hi,
I'm using the STM32F746NG discovery board to connect to the thingspeak MQTT broker.
However I can't connect to the server, i'm using dns to get the server ip adres which I then use in the mqtt_client_connect function.
When I get to the callback function the status is 256 (MQTT_CONNECT_DISCONNECTED).
I've had this problem before with a local MQTT broker (mosquitto 2.0), I was able to solve this problem by installing an older version (mosquitto 1.161a).
I'm using the correct credentials because they work in the mqtt_spy application.
Has anyone had this problem before or a sollution for this problem?
With kind regards
Sébastien

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回答（1 个）

Vinod
Vinod 2021-12-31
Could you provide more information - what is the client ID of your device? We may be able to look at the server logs given the client ID to provide you some pointers.
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Andrew Bierman
Andrew Bierman 2024-3-26
My fault. Apparently, subscribing to a nonexistent channel casues the broker to disconnect. Without doing that it appears to work fine.
Youssef Amir
Youssef Amir 2024-5-2
@Andrew Bierman I am also using MQTTX, but I can't get it working. What IP address did you use for the EMQX broker

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