Receive GPS data by subscribing to the eCAL gps_data topic.
The data received is in JSON format and looks like the following:
{
"header": {
"timestamp": "1731424000660623"
},
"timestamp": "1731424000660623",
"timeUTC": "542301300000000",
"fixMode": "FM_RTK",
"latitude": 49.547821501166666,
"longitude": 11.017322984666666,
"heading": 0.0,
"speed": 0.02778,
"altitude": 315.246,
"satellitesUsed": 12,
"year": 2024,
"month": 11,
"day": 12,
"secsAfterMidnight": 0.0,
"posErr": 0.0,
"hdop": 1.0,
"vdop": 0.0,
"pdop": 0.0,
"msgCnt": 0
}