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InfluxDB
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The project is at https://github.com/HankB/MQTT_will/tree/testing
The infinite loop for sleep is the tricky bit. The purpose of this exercise is that mosquitto_pub should connect to the broker, send the startup message with last will and testament and then occasionally (optionally) send an update. If the connection from mosquitto_pub goes away w/out a clean shutdown of the connection, the broker will send the last will and testament message. I proved that this works in general with this exploration https://github.com/HankB/Fun_with_MQTT and now I want to expand on that to "home lab quality."