I'm trying to figure out if Btraced is connecting to my home MQTT server OK. I got the DDNS and port forwarding working I think. But I should be able to use mosquitto_sub -t "topic_name" to see the MQTT messages the Btraced is sending my MQTT broker, if I knew what the topic name is.
But Btraced's Android app configuration doesn't tell you what the topic name it's sending to the MQTT broker is. So how do you figure that out? What's the rubric?