How can I use the Sixfab Cellular modem with OpenWRT?

Installing and Using OpenWrt
21

Should be no problem providing network status via at commands?

22

Have you tried the Luci-App-ModemManager packages?

https://openwrt.org/docs/guide-user/network/wan/wwan/modemmanager

It improves on both LibMBIM and LibQMI for newer modems - Qualcomm-based and others...

23

Thank you for your reply. I just tested this out with the T-Mobile SIM, and it seems like it's still failing. Here is what I have in my network file. Is there something else I'm missing?

config interface '4G'
        option proto 'modemmanager'
        option device '/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1'
        option apn 'fast.t-mobile.com'
        option auth 'none'
        option iptype 'ipv4v6'
        option loglevel 'ERR'

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24

I think there is another problem before it gets to the IP assignment stage, but also keep in mind that T-Mobile is v6 only. v4 compatibility may be implemented in the modem or you can use 464xlat on OpenWrt.
And AT&T is v4 only, with CGNAT.