Both Node.JS and NPM (or yarn) need to be installed on your machine. You can find installation instructions on their respective websites.
Run yarn install to install the dependencies.
You can use the following environment variables to set the demo application up to integrate with The Things Stack. You will need do provide:
TTN_APP_ID: The ID of the app that is sending the uplinks you want to trackTTN_API_KEY: The API Key that allows writing downlink trafficTTN_WEBHOOK_ID: The ID of the webhook used to schedule downlinksTTN_DEVICE_ID: The ID of the end device that you want the downlinks to be sent toPORT: The port that the http server will run on (default 3000)
Start the server via node index.js. It will then expose the http server on port 3000 (unless configured otherwise).
The simple Node.JS application does a couple of things:
- Expose a website that shows the latest temperature and humidity values as well as live data in a chart
- Expose a websockets service to communicate with the client to update the newest data as it is coming in
- Listen for requests on the
/webhooksendpoint and storing the results in memory - Using a TTS configured webhook to schedule downlinks to an end device, when an uplink has been received
The application is assuming that you are using an end device that is set up to send (decoded) uplinks including a temperature and humidity prop. It also assumes that you use a Kuando Busylight end device, so that it toggles it on and off via the downlinks sent by the application. It is however easy to modify the application to do different things if your setup differs.
I've tried to keep the application as simple as possible so it does not use any transpilation or frontend framework and can be started right away. You can find the backend code in index.js, the client code in public/main.js.
You can watch me walking through the setup of this application here. I also explain how to set up your application in The Things Stack to run this application.