Walkie Talkie - transmit and receive audio on the same network https://f-droid.org/repository/browse/?fdfilter=walkie+talkie&fdid=org.jsl.wfwt
Walkie Talkie - transmit and receive audio on the same network https://f-droid.org/repository/browse/?fdfilter=walkie+talkie&fdid=org.jsl.wfwt