Hey all,
I'm running into trouble with ModemManager, there seems to be no way to disable
probing for certain devices.
I have found countless threads discussing the lack of this feature, but none of
them refer to my specific troubles.
We have some CDC devices that implement ACM and ether.
We want to communicate on the ttyACM of these devices, but our data keeps
getting corrupted.
After many hours we finally found out ModemManager is probing the devices, so
we added the udev rules:
/etc/udev/rules.d/78-custom-mm-blacklist-internal-modem.rules :
ACTION!="add|change|move", GOTO="custom_mm_blacklist_internal_modem_end"
ATTRS{idVendor}=="[redacted1]" ATTRS{idProduct}=="[redacted2]",
ENV{ID_MM_DEVICE_IGNORE}="1"
ATTRS{idVendor}=="[redacted1]" ATTRS{idProduct}=="[redacted3]",
ENV{ID_MM_DEVICE_IGNORE}="1"
LABEL="custom_mm_blacklist_internal_modem_end"
but looking at the logs I see:
ModemManager[3751]: <debug> [filter] (tty/ttyACM0): port filtered: device is
blocklisted
ModemManager[3751]: <debug> [filter] (net/enxd[redacted4]) port allowed: net
device
ModemManager[3751]: <debug> [filter] (net/enxd[redacted4]) port allowed: net
device
ModemManager[3751]: <debug> [filter] (tty/ttyACM0): port allowed: device also
exports a net interface
So if ModemManager successfully found the device is blocklisted, why does it
continue to probe the port?
What is the recommended mechanism to disable the probing of these devices?
I would prefer to exclude these specific devices, and not have to resort to
heavy handed solutions that alter the global rules.
Best Regards,
Menno
Menno van der Graaf
Software Developer
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