MQTT needs .onMessage(callback);

April 2020 -- playing with :

MakingThingsTalk2/3rd_edition/chapter10/catCamDeux/AirConditionerArduino/AirConditionerArduino.ino

Could not receive MQQT messages until .onMessage(messageReceived); is added

end of setup looks like :

client.begin(mqttServerAddress, netSocket); client.onMessage(messageReceived); // ***** add this line mqttConnect();

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