The communication bus or destination memory address is locked by another process.

Suggests a client–server or master–slave architecture where a central “command station” receives writes. Example (pseudo-code): write(address=command_station_v104, data=...)

xattr -drs com.apple.quarantine /Applications/CommandStationVT.app/ Use code with caution. Troubleshooting Common Command Failures

Could you tell me you are configuring (e.g., a SIMCOM module, Quectel, or an Arduino setup) so I can provide the exact command sequences you will need? rworldmap - Google Groups