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Merge G4KLX's master - #14
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A station may need to stop transmitting on command and later start again, without anyone at its console: a remote kill switch, which some licenses require of unattended stations. The obvious way, "mode lockout", can't be undone over the air: in lockout, RF data from the modem is discarded without being decoded, so a later "start" command sent from a radio is never heard. Add the remote commands "listen on" and "listen off". While on: - RF is still decoded and its calls published (JSON over MQTT) as usual, so a remote control can hear the command to start again. - The modem never keys up: CModem::setTXInhibit() drops every transmit path (D-Star, DMR, YSF, P25, NXDN, POCSAG and FM data, DMR short LC and Aloha, the CW ID) and forces a duplex DMR start to off. - Nothing heard on RF is written to a network (each network's outgoing writes check g_listenOnly), and incoming network traffic is off: the places that enable a network on a mode change keep it disabled while listening. Each network's polls continue, so gateways and reflectors stay linked. "listen off" restores the networks of the enabled modes and the CW ID timer. The state isn't kept across a restart; the remote control that set it can send it again.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Replaces #13, which conflicted. Merges W0CHP's listen-only state (g4klx#895), resolving a conflict in MMDVM-Host.cpp next to our M17 network handling, and applies listen-only to M17, which upstream doesn't have: the M17 network stays off and the modem drops M17 transmissions while it's on.