@Jonas-Belink You can check out the steps in the GitHub repo's readme file to see how to setup the server code on a dedicated server somewhere (AWS, DigitalOcean, etc).
If you just want to add your device to our existing temperature.onion.io server, see https://github.com/OnionIoT/Onion-Sensor-Server#adding-your-device
@Bart-Peperkamp Thanks! We are all super stoked about the public release! Can't wait to get all of you to start using it :)
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