Decode sensor data

[chud.wy]

Hi, I use Chirpstack Server + RAK7246 + RAK11310 + RAK1906, configured according to the example, I get “data:“AQnxEGAAAYRsAABUDg==”” in Chirpstack, how can I decode them into a human-readable form? I found RUI decoder but can’t find non-RUI

[beegee (Bernd Giesecke)]

How do you create the payload in the RAK11310? Are you using our example application Environment Sensing?

What you see in Chirpstack is the Base64 encoded payload. You have to setup a payload decoder in Chirpstack to see the sensor values.

In Chirpstack the payload decoders are defined in the Device Profiles like I did here for the WisBlock-Examples

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If you open the Device Profile, there is a tab called Codec. There you select Custom Javascript codec functions and copy the payload decoder into the marked area, overwriting the original code.

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Then you have to configurate your device to use this Device Profile. Open the device in the application view, goto configuration and select the WisBlock-Examples Device Profile:

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Here is a working decoder for the examples from the WisBlock repo. This decoder works in both Chirpstack or TTN:

// 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]
//  - variables contains the device variables e.g. {"calibration": "3.5"} (both the key / value are of type string)
// The function must return an object, e.g. {"temperature": 22.5}
function DoDecode(fPort, bytes) {
	var decoded = {};
	switch (bytes[0])
	{
		case 0x01: // Environment sensor data
			decoded.temperature = (bytes[1] << 8 | bytes[2]) / 100;
			decoded.humidity = (bytes[3] << 8 | + bytes[4]) / 100;
			decoded.pressure = (bytes[8] | (bytes[7] << 8) | (bytes[6] << 16) | (bytes[5] << 24)) / 100;
			decoded.gas = bytes[12] | (bytes[11] << 8) | (bytes[10] << 16) | (bytes[9] << 24);
			decoded.batt = (bytes[13] << 8 | bytes[14]) / 100;
			break;
		case 0x02: // Temperature and humidity sensor data
			decoded.temperature = (bytes[1] << 8 | bytes[2]) / 100;
			decoded.humidity = (bytes[3] << 8 | + bytes[4]) / 100;
			decoded.batt = (bytes[5] << 8 | bytes[6]) / 100;
			break;
		case 0x03: // Ambient light sensor data
			decoded.light = (bytes[4] | (bytes[3] << 8) | (bytes[2] << 16) | (bytes[1] << 24)) / 10;
			decoded.batt = (bytes[5] << 8 | bytes[6]) / 100;
			break;
		case 0x04: // No sensor data, just counter
			decoded.cnt = bytes[4] | (bytes[3] << 8) | (bytes[2] << 16) | (bytes[1] << 24);
			break;
		case 0x20: // Solar panel data
			decoded.current = (bytes[1] << 8 | bytes[2]);
			decoded.today = (bytes[3] << 8 | + bytes[4]);
			break;
		case 0x30: // Accelerometer sensor
        	if (bytes[1] == 0) {
				decoded.x_move = "no";
            } else {
				decoded.x_move = "yes";
            }
        	if (bytes[2] == 0) {
				decoded.y_move = "no";
            } else {
				decoded.y_move = "yes";
            }
        	if (bytes[3] == 0) {
				decoded.z_move = "no";
            } else {
				decoded.z_move = "yes";
            }
			break;
		default:
			decoded.unknown = "Unknown data format";
			break;
	}
	return decoded;
}

// For TTN
function Decoder(bytes, fPort)
{
	return DoDecode(fPort, bytes);
}

// For Chirpstack
function Decode(fPort, bytes, variables)
{
	return DoDecode(fPort, bytes);
}

[chud.wy]

Great, this is exactly what I was looking for, now everything works. It would be nice if you shared decoders for all the examples you have in WisBlock repo.