I'm sorry I wasn't very precise.
I have a Davis Vantace Pro 2 Wireless with serial datalogger.
I tried using a USB serial adapter but with several problems that led me to force the reconnection to the same USB port, then I bought a serial for Raspberry to connect directly to the GPIO but with the problem that every restart I lose the serial and the permissions.
I modified the sound card for PTT CM108, see photo.
This is all the hardware available to me.
Since yesterday I have had problems with the aprs.pkt file no longer being generated and I'm looking for the solution.
I know I've made a lot of software confusion and so I was asking for a guideline.
Regards
Massimiliano
IZ4SJB