How to use both /dev/cdc-wdm0 and /dev/cdc-wdm1 at the same time?

Solution Verified - Updated -

Issue

  • How to use both /dev/cdc-wdm0 and /dev/cdc-wdm1 at the same time?
  • The modem Sieraa MC7304 provides two ethernet interfaces (cdc-wdm0 and cdc-wdm1). How do I have cdc-wdm0 connected to one APN, and cdc-wdm1 connected to another APN concurrently at the same time?
  • /dev/cdc-wdm1 appears in /dev/ but not in mmcli -L
# qmi-network cdc-wdm1 start

Loading profile at /etc/qmi-network.conf
    APN: internet
    APN user: internet
    APN password: internet
     qmi-proxy: no
Checking data format with 'qmicli -d cdc-wdm1 --wda-get-data-format '....
error: couldn't create QmiDevice: Couldn't query file info: Error when getting information for file '/proc/PID/net/cdc-wdm1' no such file or directory
Device link layer protocolnot retrieved: WDMA unsupported

Environment

  • Red Hat Enterprise Linux 7
  • GSM Modem device with multiple modem bearers (eg: Sierra MC7304)

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