The firmware UI had a feature to send an advert, which is useful,
but often when out and about I'd like to ping a repeater and get
a signal report, especially when scouting areas. I implemented this
by making the last packet RSSI accessible, adding ping functionality
to MyMesh and implementing some UI changes to allow selecting rows
in the recent adverts screen with a long press, then short presses
to move between rows, and a long press to send a ping. I also made the
selection mode time out after 10 seconds.