Quectel RM520N-GL stops responding after few hours

IoT Modules 5G Module
1

Hey,

I have Quectel RM520N-GL connected to my router. I updated the latest available firmware RM520NGLAAR01A08M4G_01.206.01.206 into it and it’s now working a bit longer without problems.

$ lsusb
Bus 001 Device 006: ID 2c7c:0801 Quectel RM520N-GL
Bus 002 Device 001: ID 1d6b:0003 Linux 5.4.211 xhci-hcd xHCI Host Controller
Bus 001 Device 003: ID 05e3:0752 Generic USB Storage
Bus 001 Device 002: ID 05e3:0618  USB2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux 5.4.211 xhci-hcd xHCI Host Controller

It works properly for 2-20 hours and then the /dev/mhi_DUN stops responding.

So initially after rebooting the router it works properly and I can reach the network and all of the AT commands work well.

But at some point it just stops responding and these commands timeout:

$ timeout 5s echo -e "AT\r" > /dev/mhi_DUN
$ timeout 5s echo -e "AT\r" > /dev/mhi_QMI0

I’m wondering what could be the cause of this?

2

Dear @onnimonni
Driver version?
Do you try to use minicom or busybox microcom for testing?