this post was submitted on 13 Jan 2024
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Privacy
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I'd be ripping that app apart and patching it to skip the payment step.
They make you make an account tied to your email, and it authenticates your account each time it connects. I've already done a teensy bit of network peeking at it, but I'm not savvy enough to try to be bypassing authentication.
You mentioned it was using Bluetooth to communicate with the actual machine so I'm assuming they are not directly connected to the internet in any way? If that's correct then it's just a case of understanding the Bluetooth comms which is probably some basic BLE stuff they put together by tweaking the sample code from the BLE chip manufacturer.