I have two MC7750 modems and one I have configured as, which is exactly what I want:
AT!UDUSBCOMP=? 0 - HIP DM NMEA AT MDM1 MDM2 MDM3 MS NOT SUPPORTED 1 - HIP DM NMEA AT MDM1 MS NOT SUPPORTED 2 - HIP DM NMEA AT NIC1 MS NOT SUPPORTED 3 - HIP DM NMEA AT MDM1 NIC1 MS NOT SUPPORTED 4 - HIP DM NMEA AT NIC1 NIC2 NIC3 MS NOT SUPPORTED 5 - HIP DM NMEA AT ECM1 MS NOT SUPPORTED 6 - DM NMEA AT QMI SUPPORTED 7 - DM NMEA AT RMNET1 RMNET2 RMNET3 SUPPORTED 8 - Win8 Std Net SUPPORTED OK AT!UDUSBCOMP? !UDUSBCOMP: 6 OK
However I have this other modem which is in a different mode, but I don’t know in which mode and I don’t know how to change it from Linux.
On the machine with NOT desired modem setup I have:
# lsusb -d 1199:68a2 Bus 002 Device 003: ID 1199:68a2 Sierra Wireless, Inc. MC7750 # usb_modeswitch -W -v 1199 -p 68a2 -R ... # dmesg ... [Wed Apr 12 19:14:12 2023] qcserial ttyUSB0: Qualcomm USB modem converter now disconnected from ttyUSB0 [Wed Apr 12 19:14:12 2023] qcserial 2-1.3:1.0: device disconnected [Wed Apr 12 19:14:12 2023] usb 2-1.3: reset high-speed USB device number 3 using ehci-pci [Wed Apr 12 19:14:12 2023] qcserial 2-1.3:1.0: Qualcomm USB modem converter detected [Wed Apr 12 19:14:12 2023] usb 2-1.3: Qualcomm USB modem converter now attached to ttyUSB0 [Wed Apr 12 19:14:12 2023] gpio-keys-polled gpio-keys-polled: unable to claim gpio 0, err=-517 [Wed Apr 12 19:14:12 2023] gpio-keys-polled gpio-keys-polled: unable to claim gpio 0, err=-517
As you can see it only attaches
ttyUSB0 but no other serial devices, nor QMI device. If I connect to
minicom(1) I cannot type in any AT commands, like
# minicom -b 115200 -D /dev/ttyUSB0 ...
Welcome to minicom 2.8 OPTIONS: I18n Compiled on Jan 9 2021, 12:42:45. Port /dev/ttyUSB0, 07:29:20 Press CTRL-A Z for help on special keys
and no input in
minicom(1) is accepted nor no output shows up after
ATI\n characters typed in.
On the other machine with modem on
UDUSBCOMP: 6 setup, I can type
ATI\n and I have an output information about the modem.
How to set MC7750 modem into
UDUSBCOMP: 6 mode on a Linux machine?
What is important for me I DON’T want to upgrade the firmware to bring the modem back into
UDUSBCOMP: 6. I want to keep current firmware on the modem.