[arm-allstar] Message Playback following Timeout-Timer reset?

[Randy Neals]

We would like to playback a message on reset of tx_timeoute timer.

I didn't see an obvious way to do that, and didn't uncover anything with a
search of this list.
Hoping someone has figured this out and might throw a clue our way...

The use case is to play a message when a long-winded user releases their
PTT, following expiry of the Time Out Timer. In hardware controllers it
might say "Time Out Timer Reset".
Upon release of PTT, this tells the user that they timed out the repeater
and they will need to say part of their transmission again.

Thanks,
Randy, W3RWN
Seattle, WA