RG255C in ECM mode

IoT Modules 5G Module
1

Hello,
I am currently working with the RG255C 5G RedCap module, and I’m exploring the ECM mode with the AT+QCFG=“usbnet”,1 command. Then i define my PDP context using the AT+CGDCONT=1,“IP”,“my_apn” command. The registration to network is OK :

AT+CEREG?
+CEREG: 0,1
AT+COPS?
+COPS: 0,0,“Orange F”,7
AT+QCSQ
+QCSQ: “LTE”,-72,-100,12,-8

I got an IP with: udhcpc -i usb0, but my ping to 8.8.8.8 is not working

It’s possible that I might have missed out on certain essential steps to ensure a connection in ECM mode.

Thanks,

2

Dear @hmaied
Please check the response of route -n and check the default route.

3

Hello,
I am facing a similar Issue. I have the RG255C-GL in ECM Mode and cannot ping from the linux device (Raspberry pi)

AT+CEREG?
+CEREG: 0,1
AT+COPS?
+COPS: 0,0,“o2 - de”,7
AT+QPING=1,“8.8.8.8”
+QPING: 0,“8.8.8.8”,32,53,255
+QPING: 0,“8.8.8.8”,32,36,255
+QPING: 0,“8.8.8.8”,32,36,255
+QPING: 0,“8.8.8.8”,32,37,255
+QPING: 0,4,4,0,36,53,40

So from my point of view, the modem is connecting and working. However from the pi I am not able to to send any data through the modem.

ip r:
default via 192.168.224.1 dev usb0
192.168.224.0/22 dev usb0 proto kernel scope link src 192.168.226.62

ping 192.168.224.1
works

ping 8.8.8.8
does not

Any ideas?

4

You need set
AT+QMAPWAC=1
It takes effect after reboot.

1 Like
5

Thank you @Bean.Wang-Q, that worked

6

LTE connection is working after using the AT+QMAPWAC=1 command, but I cannot register on 5G.

I have selected 5G mode using the following command:
AT+QNWPREFCFG=“mode_pref”,NR5G

I can list the available operators with AT+COPS:

+COPS: (1,"Free","Free","20815",12),(1,"Free","Free","20815",7),(3,"F SFR","SFR","20810",7),(3,"F-Bouygues Telecom","BYTEL","20820",7),
(3,"F SFR","SFR","20810",12),(1,"Free","Free","20816",12),(1,"Orange F","Orange","20801",12),(1,"Free","Free","20816",7),
(1,"Orange F","Orange","20801",7),(0-4),(0-2)

However, when I check the signal quality using AT+QCSQ, I get:
+QCSQ: “NOSERVICE”

7

Dear @hmaied
For RG255C, it only supports 20MHz in 5G.
Please check bandwidth of 5G network.