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@Gordon
By serial, do you mean over the Bluetooth connection?
The nRF52s only have one serial port, so that's the one it'd be using for the modem. If you were using it for something else as well then you'd be very likely to get conflicts.
If you mean Bluetooth I have no idea really - but as far as I know
RDYwould come from the modem, so perhaps there's some code somewhere that is causing it to be mirrored over Bluetooth LE (like aconsole.logfor error conditions or something).