Hi! This is something that's been a frustration for me for a while. Basically Gadgetbridge is big on privacy, so much so that they will never add any internet connectivity to it (although you could build it in yourself).
Since Gadgetbridge has the Bluetooth connection open you're also a bit stuck for Bluetooth comms. My personal wish would be have a WebView running in Gadgetbridge that has access to send/receive from Bangle.js - but given the lack of internet access that's not an option.
I'd been talking to Andreas (one of the lead developers) about this and he is willing to try and add something, but it seems that inter-process comms in Android can also be a bit insecure so it's actually a bit tricky.
So right now I think you have a few options - ordered by how hard they are :)
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