SigFox backend Custom Payload : Lat::float:32:little-endian Lng::float:32:little-endian device_id::uint:16:little-endian voltage::uint:16:little-endian
Sample valid frame : $GPRMC,142853.00,A,4306.31491,N,00137.62595,E,1.395,,250717,,,A*76
GPS Receiver used : SparkFun GPS Receiver - GP-20U7 (56 Channel) - https://www.sparkfun.com/products/13740