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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
I'm not sure what to suggest I'm afraid. You could hook onto
gattserverdisconnectedand see ifreasongives you anything useful: http://www.espruino.com/Reference#l_BluetoothDevice_gattserverdisconnectedHowever their choice of UUIDs is a bit concerning. If you're developing a device there's a specific part of the UUID you should change (https://www.espruino.com/About+Bluetooth+LE#128-bit-uuids) so as not to end up registering multiple 128 bit UUIDs - and they're not doing that so instead of 1 UUID the GPS is using 4.
That shouldn't be an issue as we have 10 slots in Espruino, but it also doesn't fill you full of confidence that the folks that made it really knew what they were doing.
When you connect with nRF Connect, do they have a bunch of other services/characteristics? I guess if they did have 10 different 128 bit UUIDs that would be enough to overwhelm Bangle.js and it would disconnect.
... out of interest, why are you wanting to connect an external GPS receiver when Bangle.js has its own?