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  • The required UART drivers are usually distributed as part of the Linux kernel since v4.4.132.

  • Check whether the required kernel module is loaded: lsmod | grep option.

  • Check whether you have read/write access to USB-UART bridge: ls -la /dev/ttyUSB*.

fefes

Linux setup & troubleshooting

Currently, the ModemManager package (confirmed for version 1.10.0-1~ubuntu18.04.2) detects the USB Connect LPWA (R410) as a general QMI-WWAN modem and tries to configure it. Besides failing this task it blocks any "user" AT commands, e.g. using minicom.

The following shell commands stop and disable the ModemManager service:

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