Add a "Firmware Update Available" notification to the device, based on data sent from the server

[DeflateAwning]

I want the device to show that a firmware update is available, when applicable. This can be done by either of the following two options (or both):

• the device sends its firmware version with each packet to the server, and then the server sends back a bit that says whether a new version is available
• the server sends, with each packet, a "latest version" data structure, which the device compares to its internal version number

It would be helpful to get feedback about when an update is available. I think it would also be a nice demonstration of how this sort of feedback is possible/easy to implement via LoRaWAN communication.

[disk91]

good idea