Avoid limbo state for electron

[RWB]

I would study this library that shows how to best handle the Electron and it's fault states.

Electron sample code for fault tolerance and problem debugging

New version of electronsample! The new version includes a library and all of the useful features are split out into classes so you can just include the ones you want instead of copy and pasting them into your code. All of the features are optional now. Battery monitoring can sleep the Electron for a period of time with the battery is low to prevent flash corruption. Modem reset does both AT+CFUN=16 and SLEEP_MODE_DEEP to maximize the chance of success. New session monitoring can publish an eve…