AsyncMqttClient - last will breaks connection

NILSRO · December 16, 2024, 11:52pm

Hi,

I try to setup a On-/Offline topic with the AsyncMqttClient library and last will function. It seems that there is a bug as if I call setWill to add the last will the client will not connect anymore to the broker.

github.com

NilsRo/ImpulseSmartMeter/blob/bae77ff3915ed0e811c1c8ed736909271ef5142c/src/main.cpp#L741-L750


      
          
          std::string tempTopic;
          tempTopic.append(mqttTopicPath);
          tempTopic.append("status");
          // mqttClient.setWill(tempTopic.c_str(), 0, true, "offline", 7);
          mqttClient.onConnect(onMqttConnect);
          mqttClient.onDisconnect(onMqttDisconnect);
          mqttClient.onPublish(onMqttPublish);
          mqttClient.onMessage(onMqttMessage);
          mqttClient.onSubscribe(onMqttSubscribe);

Does anybody knows a fix for it? I read some issues on the Github page of the library and it seems known and not fixed anymore perhaps.

Many thanks for any tip,
Nils

NILSRO · December 19, 2024, 6:26am

Solved this by setting the topic as a static variable. It will be stored as a pointer and not copied to the object. So the topic was empty on connecting to the server...

system · June 17, 2025, 6:26am

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.

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AsyncMqttClient - last will breaks connection

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