Decoder for TTN Mapper

decoder.js

function Decoder(b, port) {
  var lat = (b[0] | (b[1] << 8) | (b[2] << 16) | (b[3] << 24)) / 10000000;
  var lon = (b[4] | (b[5] << 8) | (b[6] << 16) | (b[7] << 24)) / 10000000;
  var alt = (b[8] | (b[9] << 8)) / 10; // in m
  var pdop = (b[10] | (b[11] << 8)) / 100;

  return {
    latitude: lat,
    longitude: lon,
    altitude: alt,
    hdop: pdop,
  };
}