Issue: I cant decode the frm_payload received im chirpstack
Server:Chirpstack
data is : “CAIBhgNxAQX/9APeBYb+4wBfAD8JAvOFCgIhkwsCGQU=”
Version of RAK7200 is 3.1.0.13
The data received by serial is:
Battery Voltage = 3.903 V
Acceleration(g) of X,Y,Z:
0.26,0.01,0.99
Gyro(degress/s) of X,Y,Z:
-2.85,0.95,0.63
Magnetometer(uT) of X,Y,Z:
-31.95,85.95,64.05
Thank you
I have found the solution. With Chirpstack V4 the function to decode change.
My codec javascript function is:
// 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 result = Decoder(input.fPort, bin2HexStr(input.bytes));
return {
data: {
raw: bin2HexStr(input.bytes),
campos: Decoder(input.fPort, bin2HexStr(input.bytes))
}
};
}
// 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: [225, 230, 255, 0]
};
}
// Decode decodes an array of bytes into an object.
// - fPort contains the LoRaWAN fPort number
// - bytes is an array of bytes, e.g. [225, 230, 255, 0]
// The function must return an object, e.g. {“temperature”: 22.5}
function Decoder(fPort, bytes) {
var decoded = {};
var hexString=bin2HexStr(bytes);
hexString = bytes;
return rakSensorDataDecode(hexString);
}
// convert array of bytes to hex string.
// e.g: 0188053797109D5900DC140802017A0768580673256D0267011D040214AF0371FFFFFFDDFC2E
function bin2HexStr(bytes) {
let newHex = ‘’
let currentChar = “”
for (let i=0; i<bytes.length; i++) { // Go over each 8-bit byte
currentChar = bytes[i]; // First 4-bits for first hex char
newHex += currentChar.toString(16).length == 1? “0” + currentChar.toString(16): currentChar.toString(16); // Add first hex char to string
}
return newHex;
}
// convert string to short integer
function parseShort(str, base) {
var n = parseInt(str, base);
return (n << 16) >> 16;
}
// convert string to triple bytes integer
function parseTriple(str, base) {
var n = parseInt(str, base);
return (n << 8) >> 8;
}
// decode Hex sensor string data to object
function rakSensorDataDecode(hexStr) {
var str = hexStr;
var myObj = {};
while (str.length > 4) {
var flag = parseInt(str.substring(0, 4), 16);
switch (flag) {
case 0x0768:// Humidity
myObj.humidity = parseFloat(((parseShort(str.substring(4, 6), 16) * 0.01 / 2) * 100).toFixed(1)) + “%RH”;//unit:%RH
str = str.substring(6);
break;
case 0x0673:// Atmospheric pressure
myObj.barometer = parseFloat((parseShort(str.substring(4, 8), 16) * 0.1).toFixed(2)) + “hPa”;//unit:hPa
str = str.substring(8);
break;
case 0x0267:// Temperature
myObj.temperature = parseFloat((parseShort(str.substring(4, 8), 16) * 0.1).toFixed(2)) + “°C”;//unit: °C
str = str.substring(8);
break;
case 0x0188:// GPS
myObj.latitude = parseFloat((parseTriple(str.substring(4, 10), 16) * 0.0001).toFixed(4)) + “°”;//unit:°
myObj.longitude = parseFloat((parseTriple(str.substring(10, 16), 16) * 0.0001).toFixed(4)) + “°”;//unit:°
myObj.altitude = parseFloat((parseTriple(str.substring(16, 22), 16) * 0.01).toFixed(1)) + “m”;//unit:m
str = str.substring(22);
break;
case 0x0371:// Triaxial acceleration
myObj.acceleration_x = parseFloat((parseShort(str.substring(4, 8), 16) * 0.001).toFixed(3)) + “g”;//unit:g
myObj.acceleration_y = parseFloat((parseShort(str.substring(8, 12), 16) * 0.001).toFixed(3)) + “g”;//unit:g
myObj.acceleration_z = parseFloat((parseShort(str.substring(12, 16), 16) * 0.001).toFixed(3)) + “g”;//unit:g
str = str.substring(16);
break;
case 0x0402:// air resistance
myObj.gasResistance = parseFloat((parseShort(str.substring(4, 8), 16) * 0.01).toFixed(2)) + “KΩ”;//unit:KΩ
str = str.substring(8);
break;
case 0x0802:// Battery Voltage
myObj.battery = parseFloat((parseShort(str.substring(4, 8), 16) * 0.01).toFixed(2)) + “V”;//unit:V
str = str.substring(8);
break;
case 0x0586:// gyroscope
myObj.gyroscope_x = parseFloat((parseShort(str.substring(4, 8), 16) * 0.01).toFixed(2)) + “°/s”;//unit:°/s
myObj.gyroscope_y = parseFloat((parseShort(str.substring(8, 12), 16) * 0.01).toFixed(2)) + “°/s”;//unit:°/s
myObj.gyroscope_z = parseFloat((parseShort(str.substring(12, 16), 16) * 0.01).toFixed(2)) + “°/s”;//unit:°/s
str = str.substring(16);
break;
case 0x0902:// magnetometer x
myObj.magnetometer_x = parseFloat((parseShort(str.substring(4, 8), 16) * 0.01).toFixed(2)) + “μT”;//unit:μT
str = str.substring(8);
break;
case 0x0a02:// magnetometer y
myObj.magnetometer_y = parseFloat((parseShort(str.substring(4, 8), 16) * 0.01).toFixed(2)) + “μT”;//unit:μT
str = str.substring(8);
break;
case 0x0b02:// magnetometer z
myObj.magnetometer_z = parseFloat((parseShort(str.substring(4, 8), 16) * 0.01).toFixed(2)) + “μT”;//unit:μT
str = str.substring(8);
break;
default:
str = str.substring(7);
break;
}
}
return myObj;
}
Thank you