Milesight EM300-CL: LoRaWAN Capacitive Liquid Level Sensor

function decodeUplink(input) {
  var bytes = input.bytes;
  var data = {};

  var LIQUID = { 0: "uncalibrated", 1: "full", 2: "critical low level", 255: "error" };
  var ALARM = { 0: "alarm release", 1: "critical low level alarm" };
  var CAL = { 0: "failed", 1: "success" };

  for (var i = 0; i < bytes.length; ) {
    var channel = bytes[i++];
    var type = bytes[i++];

    if (channel === 0x01 && type === 0x75) {          // battery (%)
      data.battery = bytes[i]; i += 1;
    } else if (channel === 0x03 && type === 0xed) {   // liquid status
      data.liquid = LIQUID[bytes[i]] || "unknown"; i += 1;
    } else if (channel === 0x04 && type === 0xee) {   // calibration result
      data.calibration_result = CAL[bytes[i]] || "unknown"; i += 1;
    } else if (channel === 0x83 && type === 0xed) {   // liquid alarm
      data.liquid = LIQUID[bytes[i]] || "unknown";
      data.liquid_alarm = ALARM[bytes[i + 1]] || "unknown"; i += 2;
    } else if (channel === 0xff) {                    // device info (join/power-on)
      break;
    } else {
      break;
    }
  }
  return { data: data };
}