Getting the payload data from "payload_raw" in HTTP integration

Application Development
1

Hi all, I think I am loosing my marbles…

I have HTTP integration so that the data from my TTN nodes goes to a webpage which will eventually write the data to a database, however I am having problem decoding the payload_raw field.

Using my TheThngsNode as an example, I can see I am getting a payload_raw of “DoYAHQqS”, however in this instance I have decoded it with the following function to give me :- “payload_fields”:{“battery”:3718,“event”:“interval”,“light”:29,“temperature”:27.06}. How does “DoYAHQqS” relate to the data given? When I come to using my node, the data format will be different, so I want to decode it using payload_raw.

    function Decoder(bytes, port) {
      var decoded = {};
      var events = {
        1: 'setup',
        2: 'interval',
        3: 'motion',
        4: 'button'
      };
      decoded.event = events[port];
      decoded.battery = (bytes[0] << 8) + bytes[1];
      decoded.light = (bytes[2] << 8) + bytes[3];
      decoded.temperature = ((bytes[4] << 8) + bytes[5]) / 100;
      return decoded;
}

Thank you.

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2

Resolved it, using this online tool to convert to bytes and it works fine. https://cryptii.com/base64-to-hex

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3

See also What to do with the raw payload via MQTT?

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