Add a watchdog to the Raspberry

[webbhm]

Time Estimate: 1 Day
Priority: Low

[futureagstl]

Notes from Backlog grooming 6/7/2018:

Built into Raspberry Pi software there is a watchdog that determines if something is not working and then flags

Once MQTT is in place, there will be watchdogs in cloud to determine if things are not working. This will work as a "heartbeat" function to determine if messages are not being received from the device.