Modem_GPS_Service

systemd service to be used for controlling the modem and reading GPS

This is a gRPC based micro service allowing to control the Modem-GPS card from the SolidSEnse gateway. It also allows the initialization of the card during system startup with the parametrs given in the configuration file

Modem control

The service can perform the follwing action on startup:

1. Enter the PIN code protecting the SIM card
2. Start the GPS

At any time the service is responding to a status request by answering the full state of the modem: Hardware/Software version and IMEI SIM Presence and characteristics Network and Radio Status

#gRPC server

Listening address and port are configurable. default 0.0.0.0:20231

GPS RPC

1. getPrecision: return the the fix state and GPS precision info + date and time
2. getPosition:return the GPS position
3. getVector: return the position and displacement vector

If the GPS is not fixed then only limited information from getPrecision are available, like the number of satellites

Modem RPC

1. modemCommand: execute the command in the argument message and returns the full status. Currently on the the 'status' command is implemented

Full gRPC interface in the GPS_Service.proto file

#Configuration file

the configuration file is in JSON format (parameter.json) located in /data/solidsense/modem_gps/. A default version is created when no file is existing

start_gps_service :if False (default), no rRPC server is launched, only modem intialisation is performed start_gps :initialisation of the GPS if no service is launched. The gPS is turned on in any case with the service