GL-AX1800 with RM520N-GL - network diagnostics?

[bruno]

Hi all.

I have the RM520N-GL 5G modem connected to the router. First it was connected via USB so I was able to see basic modem diagnostics, but I had issues with the connection as mentioned in this previous topic, so I able to connect via Ethernet and that was solved

Roomba is offline under GL-AX1800

Hi all, I purchased the GL-AX1800 to replace my internet provider. I chose this router because of the several access possibilities. As an internet access I'm using a 4G/5G data card. I started with a USB ZTE modem but the antenna strength was low so now just purchased a RM520N-GL and I connected it via USB as well, all working fine. Everything at home works... Except my Roomba. I can connect it to Wifi (2,4GHz), it goes through all the setup without issues, but when I go to the main page on t…

However I have no possible diagnostics right now. I am struggling with some coverage/speed issues and I can't even tell if I am getting 4G or 5G.
Is there any way to have some connection diagnostics on the router?

Thank you for your help.

[will.qiu]

Hi

Could you please share with us the network topology or some pictures showing how the RM520N-GL is connected to the AX1800?

If the connection is via Ethernet cable, you may need to check whether your RM520N-GL and its USB-to-Ethernet board support features such as running AT commands over TCP/Telnet for network diagnostics.

If that is not supported, the only option would be to use the USB connection instead, so that you can access the AT command port directly when network diagnostics are needed.

[bruno]

Hi @will.qiu and thank you for your reply.

The topology is pretty basic, I have this module

5G M.2 TO Gigabit ETH - Waveshare Wiki

Which includes the modem inside. The Ethernet port of the module is connected to the WAN port of the router. The router has both wired and wireless clients.

Going back to USB is not a solution as I had the problem reported in my previous topic. I also couldn't find any documentation which mentions running AT commands over TCP. If this isn't a "know issue" I guess I need to contact the module supplier for these informations.

I will try that and if I can get any useful information I will post it here.
Thanks

[will.qiu]

It seems that Waveshare provides a USB-C port for running AT commands.
When network diagnostics are needed, maybe you can connect your PC or laptop directly to this USB-C port.

5G M.2 TO Gigabit ETH - Waveshare Wiki

[bruno]

Yes, that might be a possibility, although they state that the RM520N-GL is one of the models which doesn't support simultaneous USB+Ethernet connection.

Anyway that's not really ideal as that forces me to have a laptop close to the modem. A proper integration to the router would be much better. I contacted the support for Waveshare, let's see if they have any solution.

[bruno]

OK, so I got a reply from Waveshare.

It seems that I should be able to telnet to the modem and run AT commands from it

Use a TCP client tool to connect to port 23 of the device's IP address and send AT commands for real-time diagnostics

However it doesn’t work. The AX1800 does not seem to provide a telnet client (eg: SSH to the router, telnet to the modem from it), and from my computer to the modem I get connection refused (I can ping and traceroute). I don’t know if it’s the AX1800 blocking telnet or if it’s just the modem refusing telnet. I tried to add a firewall rule in Luci but it didn’t do the trick so I think I will need to connect the modem directly to the computer and check.