I run a half-duplex AllStar system that is linked on the same frequency of the remote repeater.

I had to enable linktolink=yes for particular reasons so if the node wants to it will just double with the repeater while somebody is talking.

I have some particular announcements that I want the repeater to play from my node, but only if there is no traffic on the repeater. 

I would like to use a script to wait 5 minutes RX signal, and reset if there is and wait another 5 minutes, so basically wait for 5 minutes of silence on the repeater before announcing and playing the audio file. 

I know there is a file "/dev/shm/~pttstate" which activates when it transmits. Is there something similar for local receive?

Thanks

Skyler KDØWHB