// Decode uplink function.
//
// Input is an object with the following fields:
// - bytes = Byte array containing the uplink payload, e.g. [255, 230, 255, 0]
// - fPort = Uplink fPort.
// - variables = Object containing the configured device variables.
//
// Output must be an object with the following fields:
// - data = Object representing the decoded payload.
function decodeUplink(input) {
  var bytes=input.bytes;
  
  if(bytes.length != 11)
  {
    return {"data": {}};
  }
  
  var mode=(bytes[2] & 0x7C)>>2;
  var data = {};
  data.Bat_V=(bytes[0]<<8 | bytes[1])/1000 + 0.267; 
  if(mode==1)
  {
    data.Work_mode="CO2";
    data.Alarm_status=(bytes[2] & 0x01)? "TRUE":"FALSE"; 
    data.TVOC_ppb= bytes[3]<<8 | bytes[4]; 
    data.CO2_ppm= bytes[5]<<8 | bytes[6];
    data.TempC_SHT=parseFloat(((bytes[7]<<24>>16 | bytes[8])/10).toFixed(2));
    data.Hum_SHT=parseFloat(((bytes[9]<<8 | bytes[10])/10).toFixed(1));  
  }
  else if(mode==31)
  {
    data.Work_mode="ALARM";
    data.SHTEMPMIN= bytes[3]<<24>>24;
    data.SHTEMPMAX= bytes[4]<<24>>24;   
    data.SHTHUMMIN= bytes[5];
    data.SHTHUMMAX= bytes[6]; 
    data.CO2MIN= bytes[7]<<8 | bytes[8]; 
    data.CO2MAX= bytes[9]<<8 | bytes[10]; 
  }
  
  return {"data": data};
}

// Encode downlink function.
//
// Input is an object with the following fields:
// - data = Object representing the payload that must be encoded.
// - variables = Object containing the configured device variables.
//
// Output must be an object with the following fields:
// - bytes = Byte array containing the downlink payload.
function encodeDownlink(input) {
  return { bytes: []};
}