>From https://gpsd.gitlab.io/gpsd/faq.html (ctrl-f GNSS) there is this
which sounds somewhat applicable ;

> One common problem is GNSS receivers that operate over Bluetooth.
Changing the speed of these is difficult to impossible. Some go catatonic
if you try to change the serial port speed rate, which is why we have a -b
option that prevents gpsd from trying to configure the GPSes it talks to.

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buZz