TTN Multiflexmeter uplink decoder

uplink.js

function version(msb, lsb) {
  let v = (msb << 8) | lsb;
  return {
        proto: (v >> 15) & 0x01,
        major: (v >> 10) & 0x1F,
        minor: (v >> 5) & 0x1F,
        patch: (v >> 0) & 0x1F
      };
}

function decodeUplink(input) {
  let b = input.bytes;
  let data = {};
  switch(input.fPort) {
    case 1:
      data.distance_mm = (b[1] << 8) | b[0];
      data.temperature = ((b[3] << 8) | b[2]) / 10.0;
      break;
    case 2:
      fw = version(b[1], b[2]);
      hw = version(b[3], b[4]);
      data.fw_version = fw.major + "." + fw.minor + "." + fw.patch + (fw.proto ? "-proto" : "");
      data.hw_version = hw.major + "." + hw.minor + "." + hw.patch + (hw.proto ? "-proto" : "");
      break;
  }
  
  return {
    data: data,
    warnings: [],
    errors: []
  };
}