Ok, thanks. Basically, it looks like something in the kernel or the device is not responding or making the port hang. You should get more output from ModemManager, including messages about sending AT+GCAP to ttyUSB1. If the probe times out (it'll send 4 AT+GCAP requests to each port) then you should also see a message about "Closing serial port X" too.
Ok, thanks. Basically, it looks like something in the kernel or the device is not responding or making the port hang. You should get more output from ModemManager, including messages about sending AT+GCAP to ttyUSB1. If the probe times out (it'll send 4 AT+GCAP requests to each port) then you should also see a message about "Closing serial port X" too.