Unable to switch to QMI mode on RM500U-EA

IoT Modules 5G Module
1

Hello,

I’m trying to switch my RM500U-EA to QMI mode, but the card refuses the value:

AT+QCFG=“usbnet”,0
+CME ERROR: 4

I can only switch between MBIM (2) and ECM (1) modes.
Firmware version is RM500UEAAAR03A13M2G and the card is running on an aarch64 environment.

Thanks for any help.

2

Start from checking what is supported with AT+QCFG=?

3

Thanks for your reply:

AT+QCFG=?
+QCFG: "usbnet",(1,2,3,5,11,13,15)
+QCFG: "nat",(0-2)
+QCFG: "pm/wakeup",(0x0-0x1f)
+QCFG: "usbcfg",(1-65535),(1-65535),(0,1)
4

So you can see that the value of 0 is not supported.
I suggest using this modem in ECM mode with NAT off.

5

Thanks, I managed to get it to work with the following commands:

AT+QCFG="ethernet",0
AT+QCFG="usbnet",1
AT+QCFG="nat",0
AT+QNETDEVCTL=1,3,1
AT+CFUN=1,1

But after a reboot, I need to run the same commands again to get the interface up and running. Any idea how to get the settings permanent?

6

There is no need to repeat all these commands.
If your modem always starts with CFUN: 4 then I suggest you starting a separate topic on this particular issue.

7

I might have a signal issue, after performing a reboot, no more issue. Thanks @jfrog!