Common fields:
| variable | variable_name | units |
|---|---|---|
| COMMON | loop | dimensionless |
| COMMON | battery | mV |
| COMMON | charger_status | dimensionless |
| EG25G | lte_rssi | dBm |
| EG25G | gps_latitude | degrees |
| EG25G | gps_longitude | degrees |
| EG25G | gps_hdop | dimensionless |
| EG25G | gps_speed | km/h |
| EG25G | gps_course | degrees |
| EG25G | gps_num_satellites | dimensionless |