This is an uplink converter for ThingsBoard Remote integration tutorial

Uplink converter

// Decode an uplink message from a buffer
// payload - array of bytes
// metadata - key/value object
/** Decoder **/
// decode payload to JSON
var data = decodeToString(payload);
var deviceName = metadata['topic'].replace("/devices/", "");
var deviceType = 'thermostat';
var dataArray = data.split(",");
// Result object with device attributes/telemetry data
var result = {
  deviceName: deviceName,
  deviceType: deviceType,
  telemetry: {
      temperature: parseFloat(dataArray[0]),
      humidity: parseFloat(dataArray[1]),
      batteryLevel: parseInt(dataArray[2])
  }
};
/** Helper functions **/
function decodeToString(payload) {
  return String.fromCharCode.apply(String, payload);
}
function decodeToJson(payload) {
  // covert payload to string.
  var str = decodeToString(payload);
  // parse string to JSON
  var data = JSON.parse(str);
  return data;
}
return result;