RAK7205 to chirpstack -- unable to decode data

dq11 · March 4, 2020, 2:28pm

I successfully managed to via AT commands tell the unit to send the data to chirpstack on the RAK7244C
The packets are being received but I am unable to base64 decode the data

Every 12 mins or so, I get 4 packets for the RAK7205. Can you tell me why the chirpstack fails to base64 decode them properly – AYgGXvjyji4AY+I= , CAIBbQdoVwZzJn8= , AmcArwQCBq8= , A3EABv///BI= are all gibberish when I try to base64 decode them

Instead of the RAK7205 when I use a ESP32 with lorawan.ino arduino code, I get data of SGVsbG8gV29ybGQh which nicely base64 decodes to “Hello World!”

Why is the data field garbage from the RAK7205 and why am I receiving 4 distinct messages instead of one. Is the data too large to fit in one LORAWAN frame?

Using the RAK serial port tool, the bme680 sensor data and ublox gps data look fine/normal.

Thanks in advance for any insight into this matter.

3/4/2020, 8:19:35 AMnode: 1487122d.98051eapplication/3/device/60c5a8fffe75fec8/rx : msg.payload : string[420]

“{“applicationID”:“3”,“applicationName”:“RAK7205”,“deviceName”:“Rak7205Horseguards”,“devEUI”:“60c5a8fffe75fec8”,“rxInfo”:[{“gatewayID”:“dca632fffe0ca8f4”,“uplinkID”:“b40724d7-f4a2-4e82-8db8-3f7fd3721afe”,“name”:“rak_gateway”,“rssi”:-22,“loRaSNR”:11.8,“location”:{“latitude”:41.75287,“longitude”:-88.11011,“altitude”:241}}],“txInfo”:{“frequency”:905300000,“dr”:0},“adr”:true,“fCnt”:473,“fPort”:8,“data”:“AYgGXvjyji4AY+I=”}”

3/4/2020, 8:19:37 AMnode: 1487122d.98051eapplication/3/device/60c5a8fffe75fec8/rx : msg.payload : string[420]

“{“applicationID”:“3”,“applicationName”:“RAK7205”,“deviceName”:“Rak7205Horseguards”,“devEUI”:“60c5a8fffe75fec8”,“rxInfo”:[{“gatewayID”:“dca632fffe0ca8f4”,“uplinkID”:“173589ed-5ecb-42cc-a61d-ff4a810b86fd”,“name”:“rak_gateway”,“rssi”:-24,“loRaSNR”:14.2,“location”:{“latitude”:41.75287,“longitude”:-88.11011,“altitude”:241}}],“txInfo”:{“frequency”:903900000,“dr”:0},“adr”:true,“fCnt”:474,“fPort”:8,“data”:“CAIBbQdoVwZzJn8=”}”

3/4/2020, 8:19:38 AMnode: 1487122d.98051eapplication/3/device/60c5a8fffe75fec8/rx : msg.payload : string[416]

“{“applicationID”:“3”,“applicationName”:“RAK7205”,“deviceName”:“Rak7205Horseguards”,“devEUI”:“60c5a8fffe75fec8”,“rxInfo”:[{“gatewayID”:“dca632fffe0ca8f4”,“uplinkID”:“b4b75ae5-39a0-4198-a261-a329e496a38f”,“name”:“rak_gateway”,“rssi”:-19,“loRaSNR”:12.5,“location”:{“latitude”:41.75287,“longitude”:-88.11011,“altitude”:241}}],“txInfo”:{“frequency”:904500000,“dr”:0},“adr”:true,“fCnt”:475,“fPort”:8,“data”:“AmcArwQCBq8=”}”

3/4/2020, 8:19:40 AMnode: 1487122d.98051eapplication/3/device/60c5a8fffe75fec8/rx : msg.payload : string[414]

“{“applicationID”:“3”,“applicationName”:“RAK7205”,“deviceName”:“Rak7205Horseguards”,“devEUI”:“60c5a8fffe75fec8”,“rxInfo”:[{“gatewayID”:“dca632fffe0ca8f4”,“uplinkID”:“74cd0706-caf7-431c-9461-bae72ebfc712”,“name”:“rak_gateway”,“rssi”:-22,“loRaSNR”:12,“location”:{“latitude”:41.75287,“longitude”:-88.11011,“altitude”:241}}],“txInfo”:{“frequency”:905100000,“dr”:0},“adr”:true,“fCnt”:476,“fPort”:8,“data”:“A3EABv///BI=”}”

3/4/2020, 8:20:07 AMnode: 1487122d.98051eapplication/2/device/00066b5341291472/rx : msg.payload : string[428]

“{“applicationID”:“2”,“applicationName”:“ESP32_Lorawan”,“deviceName”:“ESP_LoraABP_Device04”,“devEUI”:“00066b5341291472”,“rxInfo”:[{“gatewayID”:“dca632fffe0ca8f4”,“uplinkID”:“f35b13e1-653c-4dc6-907d-4cedce0def0c”,“name”:“rak_gateway”,“rssi”:-30,“loRaSNR”:10.2,“location”:{“latitude”:41.75287,“longitude”:-88.11011,“altitude”:241}}],“txInfo”:{“frequency”:904500000,“dr”:1},“adr”:true,“fCnt”:650,“fPort”:1,“data”:“SGVsbG8gV29ybGQh”}”

Nicholas · March 5, 2020, 1:45am

github.com

RAKWireless/RUI_LoRa_node_payload_decoder/blob/master/RUISensorDataDecoder_for_ChirpStack.js

// chirpstack application function to decode uplink data.
// 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
// for RAK, return {
//                     "DecodeDataHex": {} // RAK5205 sensor data in Hex format
//                     "DecodeDataObj": {} // RAK5205 sensor data object.
//                 }
// The function prototype cannot be modified.
function Decode(fPort, bytes) {
  var decoded = {"DecodeDataHex": {}, "DecodeDataObj": {}};
  var hexString=bin2HexStr(bytes);
  decoded.DecodeDataHex = hexString;
  decoded.DecodeDataObj = rakSensorDataDecode(hexString);

  return decoded;
}

// convert array of bytes to hex string.

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Here is a source of the parsing script, you need to follow the diagram operation to add the script to the diagram location and save, you can carry on the data parsing.

dq11 · March 5, 2020, 3:08am

Nicholas,
Thanks for that snippet of code. I am now able to successfully decode the data correctly in chirpstack

data:“AYgGXwDyjjAAZFA=”
objectJSON:"{“DecodeDataHex”:“0188065f00f28e30006450”,“DecodeDataObj”:{“gps”:{“altitude”:“256.8m”,“latitude”:“41.7536°”,“longitude”:“1589.6112°”}}}"
data:“CAIBbQdoSgZzJr4=”
objectJSON:"{“DecodeDataHex”:“0802016d07684a067326be”,“DecodeDataObj”:{“battery”:“3.65V”,“environment”:{“barometer”:“991.80hPa”,“humidity”:“37.0% RH”}}}"
data:“AmcA0gQCB68=”
objectJSON:"{“DecodeDataHex”:“026700d2040207af”,“DecodeDataObj”:{“environment”:{“gasResistance”:“19.67KΩ”,“temperature”:“21.00°C”}}}"
data:“A3EAHf/9/B0=”
objectJSON:"{“DecodeDataHex”:“0371001dfffdfc1d”,“DecodeDataObj”:{“acceleration”:{“x”:“0.029g”,“y”:"-0.003g",“z”:"-0.995g"}}}"

Nicholas · March 5, 2020, 3:18am

I’m glad to have solved the problem for you.

dq11 · March 5, 2020, 5:28pm

Nicholas,

Why is the longitude not a negative number and such a large positive number?

My lat long is supposed to be something like this {“latitude”:41.75287,“longitude”:-88.11011,“altitude”:241}

But 7205 is reporting {“gps”:{“altitude”:“256.8m”,“latitude”:“41.7536°”,“longitude”:“1589.6112°”}}

Is there a conversion from positive longitude format to the negative longitude format?

Thanks

Nicholas · March 6, 2020, 6:24am

Where did you get this GPS data? Is it the true value of the node log or the location?

taylor · March 6, 2020, 7:23am

Anand,

Thank you for telling us about this bug.I have fixed the bug, please download the newest script from github.

github.com

RAKWireless/RUI_LoRa_node_payload_decoder/blob/master/RUISensorDataDecoder_for_ChirpStack.js

// chirpstack application function to decode uplink data.
// 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
// for RAK, return {
//                     "DecodeDataHex": {} // RAK5205 sensor data in Hex format
//                     "DecodeDataObj": {} // RAK5205 sensor data object.
//                 }
// The function prototype cannot be modified.
function Decode(fPort, bytes) {
  var decoded = {"DecodeDataHex": {}, "DecodeDataObj": {}};
  var hexString=bin2HexStr(bytes);
  decoded.DecodeDataHex = hexString;
  decoded.DecodeDataObj = rakSensorDataDecode(hexString);

  return decoded;
}

// convert array of bytes to hex string.

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kkalbaugh · March 6, 2020, 2:52pm

Has anyone else had an issue where the “Ω” in the air/gas resistance causes thingsboard to ignore the payload? If I remove the “Ω” from “KΩ” then the payload is received. If it’s there then it doesn’t work.

dq11 · March 6, 2020, 6:56pm

taylor,
Confirmed that your fix works
{“gps”:{“altitude”:“224.5m”,“latitude”:“41.7528°”,“longitude”:"-88.1099°"}}}

system · March 8, 2020, 6:56pm

This topic was automatically closed 2 days after the last reply. New replies are no longer allowed.

taylor · March 9, 2020, 1:24am

1.Is there any problem with other data with units, such as temperature and humidity?
2.Check if unit must be defined in thingsboard.
3.Check if thingsboard defines its own JSON format.

Please reply according to the above questions. Meanwhile, I will test thingsboard flatform.

taylor · March 9, 2020, 1:27am

OK，Thanks for your support of RAK products.