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Lenny

There we go, the insanity in action.

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I'm using three decommissioned phones and a stationary notebook, all connected via . The phones connect to the train hub via Bluetooth (longer trains actually have two hubs connected simultaneously).

It's all done using web technology, meaning the phones just open a website in their browser. Video and control data (speed, battery level, etc.) is transmissioned via WebRTC through an SFU, all fully end-to-end encrypted, of course.

What I haven't shown here is that it leverages the group call technology, therefore people can actually see the trains in action inside the Threema app if the group call is announced inside a Threema group.

Trivia: All trains actually use the same Threema ID. That is a feature, so that people using multi-device can join the same group call in Threema. But before this was added to Threema Desktop 2.0, the first real-world use case was controlling LEGO trains in 2023.
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