Hello,
I have ModemManager version 1.6.4 running on Yocto and I am using it to
communicate with a Telit LE910 V2 over MBIM.
Along with MM I have running my own process that sends and receives AT commands
over one of the serial interfaces (ttyACM0) and so I want to use this port
exclusively for my process and not have MM open/read/write to it
How do prevent MM from accessing one or all of the serial ports?
I have tried adding udev rules for MM to ignore only the serial ports but this
does not work
KERNEL=="ttyACM*", ENV{ID_MM_DEVICE_IGNORE}="1"
Note that I do want to generate udev events for ttyACM0 since my custom process
relies on it to identify an AT capable serial port, however I want MM to avoid
using this port.
Snippet of mmcli -m 0 ouput:
-------------------------
Hardware | manufacturer: 'Generic'
| model: 'MBIM [1BC7:0032]'
| revision: '20.00.502.7-ATT'
| supported: 'gsm-umts, lte'
| current: 'gsm-umts, lte'
| equipment id: '358148061058728'
-------------------------
System | device:
'/sys/devices/platform/soc/soc:internal-regs/d005e000.usb/usb1/1-1'
| drivers: 'cdc_acm, cdc_mbim'
| plugin: 'Generic'
| primary port: 'cdc-wdm0'
| ports: 'ttyACM3 (at), cdc-wdm0 (mbim), wwan0 (net),
ttyACM0 (at)'
Snippet of udevadm info --export-db:
P:
/devices/platform/soc/soc:internal-regs/d005e000.usb/usb1/1-1/1-1:1.0/tty/ttyACM0
N: ttyACM0
S: serial/by-id/usb-Telit_FIH7160_358148061058728-if00
S: serial/by-path/platform-d005e000.usb-usb-0:1:1.0
E: DEVLINKS=/dev/serial/by-path/platform-d005e000.usb-usb-0:1:1.0
/dev/serial/by-id/usb-Telit_FIH7160_358148061058728-if00
E: DEVNAME=/dev/ttyACM0
E:
DEVPATH=/devices/platform/soc/soc:internal-regs/d005e000.usb/usb1/1-1/1-1:1.0/tty/ttyACM0
E: ID_BUS=usb
E: ID_MM_CANDIDATE=1
E: ID_MODEL=FIH7160
E: ID_MODEL_ENC=FIH7160
E: ID_MODEL_ID=0032
E: ID_PATH=platform-d005e000.usb-usb-0:1:1.0
E: ID_PATH_TAG=platform-d005e000_usb-usb-0_1_1_0
E: ID_REVISION=1729
E: ID_SERIAL=Telit_FIH7160_358148061058728
E: ID_SERIAL_SHORT=358148061058728
E: ID_TYPE=generic
E: ID_USB_DRIVER=cdc_acm
E: ID_USB_INTERFACES=:020201:0a0000:020d00:020e00:0a0001:0a0002:
E: ID_USB_INTERFACE_NUM=00
E: ID_VENDOR=Telit
E: ID_VENDOR_ENC=Telit
E: ID_VENDOR_ID=1bc7
E: MAJOR=166
E: MINOR=0
E: SUBSYSTEM=tty
E: TAGS=:systemd:
E: USEC_INITIALIZED=2777690
Please let me know if you need more information.
Thanks for your help,
Shijo
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