Connecting to Datacake, route tutorial

Troubleshooting
4

Hey @mdede439,

I just took a pass through the tutorial. Although it’s perhaps a bit confusing, the step that has you create the Datacake route doesn’t actually tell you to include a JSONata expression (see Route Tutorial - Blues Wireless Developers).

The reason the route fails with a JSONata expression is because the Decoder code looks for a data.body, and that body property doesn’t exist after JSONata processes the JSON. You can tweak the Decoder code to get it to work with the JSONata expression though. I just tried this out this Decoder with the tutorial’s JSONata expression and it worked fine.

function Decoder(request) {
   var data = JSON.parse(request.body);
   var device = data.device; // this is your Device UID

   var decoded = {};
   decoded.temp = data.temp;
   decoded.humidity = data.humidity;
   decoded.location = "(" + data.tower_lat + "," + data.tower_lon + ")";
   decoded.time = data.when;

   return [
      {
            device: device,
            field: "TEMP",
            value: decoded.temp
      },
      {
            device: device,
            field: "HUMIDITY",
            value: decoded.humidity
      },
      {
            device: device,
            field: "LOCATION",
            value: decoded.location
      },
      {
            device: device,
            field: "TIME",
            value: decoded.time
      }
   ];
}

Hopefully that makes sense, and if you have any other questions let us know.

TJ

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