Trigger Remote Firmware upgrade

[syepes]

Details of the feature request

It would be great to be able to trigger the firmware upgrade remotely without having to access the counter.
Some sort of MQTT trigger that would make it upgrade on the next wake up period.

Need quickly ?

false

[xmow49]

to be tested, but I don't think there's enough energy to do an OTA without an external power supply.

[ebretteville]

Do we need to pair the ticmeter in WiFi to perform a firmware upgrade? Mine has been only paired in ZigBee