So I took whatever I found earlier in this thread and I cleaned it up. Result below.
// Convert the two byte sensor data format to a signed number
//
// tInt: the integer portion of the temperature
// tDec: the fractional portion of the temperature
function convertTempUnits(tDec, tInt) {
// the integer portion is a signed two's complement value; convert it
// to a signed number
if (tInt > 127) {
tInt -= 256;
}
// the fractional portion of the number is unsigned and represents the
// part of the temperature after the base 10 decimal point
return tInt + (tDec * (tInt < 0 ? -1 : 1) / 100);
}
function asTempAndRh(decoded, bytes) {
decoded.Humidity = bytes[2]/100.0 + bytes[3];
decoded.Temperature = convertTempUnits(bytes[4], bytes[5]);
switch( bytes[6] ) {
case 0:
decoded.BatteryCapacity = "0-5%";
break;
case 1:
decoded.BatteryCapacity = "5-20%";
break;
case 2:
decoded.BatteryCapacity = "20-40%";
break;
case 3:
decoded.BatteryCapacity = "40-60%";
break;
case 4:
decoded.BatteryCapacity = "60-80%";
break;
case 5:
decoded.BatteryCapacity = "80-100%";
break;
default:
decoded.BatteryCapacity = "This value is not supported";
}
decoded.AlarmMsgCount = ((bytes[7]<<8)>>>0) + bytes[8];
decoded.BacklogMsgCount = ((bytes[9]<<8)>>>0) + bytes[10];
}
function asTempAndRhAggregate(decoded, bytes) {
decoded.AlarmMsgCount = bytes[2];
decoded.BacklogMsgCount = ((bytes[3]<<8)>>>0) + bytes[4];
switch( bytes[4] ) {
case 0:
decoded.BatteryCapacity = "0-5%";
break;
case 1:
decoded.BatteryCapacity = "5-20%";
break;
case 2:
decoded.BatteryCapacity = "20-40%";
break;
case 3:
decoded.BatteryCapacity = "40-60%";
break;
case 4:
decoded.BatteryCapacity = "60-80%";
break;
case 5:
decoded.BatteryCapacity = "80-100%";
break;
default:
decoded.BatteryCapacity = "This value is not supported";
}
var numberOfReadings = bytes[5];
// 2015-01-01T00:00:00+00:00 = 1420070400
var timestamp = ((bytes[6]<<24)>>>0) + ((bytes[7]<<16)>>>0) + ((bytes[8]<<8)>>>0) + bytes[9];
timestamp = timestamp + 1420070400; // 1 Jan 2015 to 1 Jan 1970
//decoded.Time = new Date(timestamp*1000);
decoded.timestamp = timestamp;
decoded.readings = [];
for(var i=0; i<numberOfReadings; i++) {
var offset = 10 + (i*4);
var sample = {};
if(offset+1>bytes.length-1) continue;
sample['Humidity'] = bytes[offset]/100.0 + bytes[offset+1];
if(offset+3>bytes.length-1) continue;
sample['Temperature'] = convertTempUnits(bytes[offset+2], bytes[offset+3]);
decoded.readings.push(sample);
}
}
function asBacklogTempAndRh(decoded, bytes) {
var timestamp = ((bytes[2]<<24)>>>0) + ((bytes[3]<<16)>>>0) + ((bytes[4]<<8)>>>0) + bytes[5];
timestamp = timestamp + 1420070400; // 1 Jan 2015 to 1 Jan 1970
//decoded.Time = new Date(timestamp*1000);
decoded.timestamp = timestamp;
decoded.Humidity = bytes[6]/100.0 + bytes[7];
decoded.Temperature = convertTempUnits(bytes[8], bytes[9]);
}
function asBacklogTempAndRhAggregate(decoded, bytes) {
var numberOfReadings = bytes[2];
// 2015-01-01T00:00:00+00:00 = 1420070400
decoded.readings = [];
for(var i=0; i<numberOfReadings; i++) {
var offset = 3 + (i*8);
var sample = {};
if(offset+3>bytes.length-1) continue;
var timestamp = ((bytes[offset]<<24)>>>0) + ((bytes[offset+1]<<16)>>>0) + ((bytes[offset+2]<<8)>>>0) + bytes[offset+3];
timestamp = timestamp + 1420070400; // 1 Jan 2015 to 1 Jan 1970
//decoded.Time = new Date(timestamp*1000);
sample['timestamp'] = timestamp;
if(offset+5>bytes.length-1) continue;
sample['Humidity'] = bytes[offset+4]/100.0 + bytes[offset+5];
if(offset+7>bytes.length-1) continue;
sample['Temperature'] = convertTempUnits(bytes[offset+6], bytes[offset+7]);
decoded.readings.push(sample);
}
}
function asSensorConfigSimple(decoded, bytes) {
switch(bytes[2]) {
case 1:
decoded.BatteryType = "Zinc-Manganese Dioxide (Alkaline).";
break;
case 2:
decoded.BatteryType = "Lithium/Iron Disulfide (Primary Lithium).";
break;
default:
decoded.BatteryType = "Unknown battery type";
}
decoded.ReadSensorPeriod = ((bytes[3] << 8)>>>0) + bytes[4];
decoded.SensorAggregate = bytes[5];
decoded.TempAlarmEnabled = (bytes[6]==1);
decoded.HumidityAlarmEnabled = (bytes[7]==1);
}
function asSensorConfigAdvanced(decoded, bytes) {
switch(bytes[2]) {
case 1:
decoded.BatteryType = "Zinc-Manganese Dioxide (Alkaline).";
break;
case 2:
decoded.BatteryType = "Lithium/Iron Disulfide (Primary Lithium).";
break;
default:
decoded.BatteryType = "Unknown battery type";
}
decoded.ReadSensorPeriod = ((bytes[3]<<8)>>>0) + bytes[4];
decoded.SensorAggregate = bytes[5];
decoded.TempAlarmsEnabled = (bytes[6]==1);
decoded.HumidityAlarmsEnabled = (bytes[7]==1);
decoded.TempAlarmLimitLow = bytes[8];
decoded.TempAlarmLimitHigh = bytes[9];
decoded.HumidityAlarmLimitLow = bytes[10];
decoded.HumidityAlarmLimitHigh = bytes[11];
decoded.LED_BLE = ((bytes[12]<<8)>>>0) + bytes[13];
decoded.LED_Heartbeat = ((bytes[14]<<8)>>>0) + bytes[15];
}
function asFwVersion(decoded, bytes) {
decoded.VersionYear = bytes[2];
decoded.VersionMonth = bytes[3];
decoded.VersionDay = bytes[4];
decoded.VersionMajor = bytes[5];
decoded.VersionMinor = bytes[6];
decoded.PartNumber = ((bytes[7]<<24)>>>0) + ((bytes[8]<<16)>>>0) + ((bytes[9]<<8)>>>0) + bytes[10];
}
function Decoder(bytes, port) {
// Decode an uplink message from a buffer
// (array) of bytes to an object of fields.
var decoded = {};
decoded.MsgType = bytes[0];
options = bytes[1];
decoded.Options = "";
if(options & 0x01) {
decoded.Options += "Server response is LoRa ack. ";
}
if(options & 0x02) {
decoded.Options += "Inform Server to send UT to sensor in the next downlink transmission. ";
}
if(options & 0x04) {
decoded.Options += "Sensor configuration error. ";
}
if(options & 0x08) {
decoded.Options += "Sensor has alarm condition. ";
}
decoded.Options = decoded.Options.trim();
if(decoded.Options === "") {
delete decoded.Options;
}
switch(decoded.MsgType) {
case 0x01:
asTempAndRh(decoded, bytes);
break;
case 0x2:
asTempAndRhAggregate(decoded, bytes);
break;
case 0x03:
asBacklogTempAndRh(decoded, bytes);
break;
case 0x04:
asBacklogTempAndRhAggregate(decoded, bytes);
break;
case 0x05:
asSensorConfigSimple(decoded, bytes);
break;
case 0x06:
asSensorConfigAdvanced(decoded, bytes);
break;
case 0x07:
asFwVersion(decoded, bytes);
break;
}
return decoded;
}