Data Storage Device ID Query Not Working

TTN Network and Services
21

Where can I find the server name in the event that I am not using EU868?

22

In the documentation that I already linked to above. (And sorry, I am out of here, this is too annoying for me. Success.)

1 Like
23

WHAT???

24

Both device ID queries of dl-pr26_5100 and 5100 produce not response.

I was able to get access to the decoder.

var decentlab_decoder = {
  PROTOCOL_VERSION: 2,
  /* device-specific parameters */
  PARAMETERS: {
    Pmin: 0.0,
    Pmax: 1.0
  },
  SENSORS: [
    {length: 2,
     values: [{name: 'pressure',
               displayName: 'Pressure',
               convert: function (x) { return (x[0] - 16384) / 32768 * (this.PARAMETERS.Pmax - this.PARAMETERS.Pmin) + this.PARAMETERS.Pmin; },
               unit: 'bar'},
              {name: 'temperature',
               displayName: 'Temperature',
               convert: function (x) { return (x[1] - 384) * 0.003125 - 50; },
               unit: '°C'}]},
    {length: 1,
     values: [{name: 'battery_voltage',
               displayName: 'Battery voltage',
               convert: function (x) { return x[0] / 1000; },
               unit: 'V'}]}
  ],
  read_int: function (bytes, pos) {
    return (bytes[pos] << 8) + bytes[pos + 1];
  },
  decode: function (msg) {
    var bytes = msg;
    var i, j;
    if (typeof msg === 'string') {
      bytes = [];
      for (i = 0; i < msg.length; i += 2) {
        bytes.push(parseInt(msg.substring(i, i + 2), 16));
      }
    }
    var version = bytes[0];
    if (version != this.PROTOCOL_VERSION) {
      return {error: "protocol version " + version + " doesn't match v2"};
    }
    var deviceId = this.read_int(bytes, 1);
    var flags = this.read_int(bytes, 3);
    var result = {'protocol_version': version, 'device_id': deviceId};
    // decode payload
    var pos = 5;
    for (i = 0; i < this.SENSORS.length; i++, flags >>= 1) {
      if ((flags & 1) !== 1)
        continue;
      var sensor = this.SENSORS[i];
      var x = [];
      // convert data to 16-bit integer array
      for (j = 0; j < sensor.length; j++) {
        x.push(this.read_int(bytes, pos));
        pos += 2;
      }
      // decode sensor values
      for (j = 0; j < sensor.values.length; j++) {
        var value = sensor.values[j];
        if ('convert' in value) {
          result[value.name] = {displayName: value.displayName,
                                value: value.convert.bind(this)(x),
                                unit: value.unit};
        }
      }
    }
    return result;
  }
};
function Decoder(bytes, port) {
  return decentlab_decoder.decode(bytes);
}

Thanks!

25

I suspect I know what the answer is, but given you lack of success so far, I think this is the best course of action.

Can you get the decoder removed for a while so the Data Storage just gets the raw data, un-affected by the JS decoder.

26

Removing the decoder produce a response for the device specific endpoint!
Request URL

https://ruchir_dl-pr-26_5100.data.thethingsnetwork.org/api/v2/query/dl-pr26_5100

Response Body

[
  {
    "device_id": "dl-pr26_5100",
    "raw": "AhPsAANDw1MrCrU=",
    "time": "2020-10-21T01:39:39.964664347Z"
  },
  {
    "device_id": "dl-pr26_5100",
    "raw": "AhPsAANDw1MiCrM=",
    "time": "2020-10-21T01:49:40.710677116Z"
  },
...
]
27

Since yesterday, the decoder’s README also states:

The decoders may output nested objects, which are stored as text in the TTN Data Storage integration.

:warning: The decoders may output a field named device_id, which may prohobit per-device querying in the TTN Data Storage integration.

28

Which means there is an error in the decoder.

So this thread can be closed and you can figure out the decoder’s problem.