Omega2 LTE with openwrt 23.05 gnss read from /dev/ttyUSB1

[Michael Bock]

I have the Omega2 LTE running new openwrt 23.05.3 firmware and I have successfully made a package with a c-program to read gnss positions and write these to a sqlite3 database.
I had this program working fine before on the old firmware reading from /dev/ttyUSB1

On the new firmware, /dev/ttyUSB1 is not assigned
(I can see /dev/ttyUSB2 assigned as the control interface)

I have installed the omega2-lte-base package and o2lte gnss enable looks like its working.
I have tried to install the ugps package, but i does not seem to make any difference.

how can i get reading from /dev/ttyUSB1 to work (like on the old firmware) ?

thanks

Michael