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

[Garfield Watkins]

Unfortunately there doesn't seem to be a way for to write a udev rule 
against a pseudo terminal...

On 3/8/24 11:31, Aleksander Morgado wrote:
> 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
>
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