ModemManager and Quectel RM520N-GL

[Peter Naulls]

On 3/2/23 14:21, Patrick Kosiol wrote:
> Hi,
> 
> It appears my ModemManager cannot initialize the Quectel RM520N-GL modem with the messages
> <dbg> [000001775.270989] [modem0] couldn't start parent initialization: Couldn't open ports during modem initialization: Couldn't get primary port
> <wrn> [000001775.275716] [modem0] modem couldn't be initialized: Failed to load current capabilities: Couldn't peek client for service ‘nas'
> 
> Perhaps someone has an idea what the reason might be? That would help me very much.
> 

I'm not seeing the USB serial devices for your modem, i.e, /dev/ttyUSBx.  It may 
be that you need a usb_modeswtich invocation.  ModemManager won't pick it up 
until these exist.