How to probe a modem exposing virtual ports (GSM 07.10 muxed ports)

[Aleksander Morgado]

Hey Garfield,

> I have a situation where I have a ublox modem, the LISA u200, wired up using its SPI bus as the communication channel. On the DTE side is a raspberry pi SBC with a custom spi platform driver that exposes a tty device for modem. This driver is not capable of multiplexing and exposing multiple virtual channels.
>
> To overcome this I have a user mode daemon that performs this function by connection to the single tty port exposed by the spi driver and in turn creating 5 pseudo tty's (/dev/ptty1 -> /dev/ptty5) to interact with. These are actually links to /dev/pts/1 to /dev/pts/5.
>
> I want the ublox plugin to manage this device but there seems to be no way to filter/grab those ports.
>

You should be able to add the ID_MM_PHYSDEV_UID udev tags for all
those pseudo TTYs, so that ModemManager can "bind" all those ports
together to the same modem object, see
https://www.freedesktop.org/software/ModemManager/doc/latest/ModemManager/ModemManager-Common-udev-tags.html#ID-MM-PHYSDEV-UID:CAPS

-- 
Aleksander