I'm having problems with MQTT, how do I debug the connection?
In the Adafruit_MQTT library folder, find the file Adafruit_MQTT.h
Near the top of the file is a line:
// Uncomment/comment to turn on/off debug output messages. //#define MQTT_DEBUG
Uncomment that #define and recompile/upload your Adafruit_MQTT example to get full debug output - its *very* detailed but shows all the packets sent and received
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