RG255C: how to control define which PDP is enabled for connection

IoT Modules 5G Module
1

Hi.

Testing a RG255C-GL with RG255CGLABR01A04M4G firmware. The configuration is the default one having following PDP defined:

AT+CGDCONT?
+CGDCONT: 1,"IPV4V6","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0,,,,,,,,,,"",,,,0
+CGDCONT: 2,"IPV4V6","ims","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0,,,,,,,,,,"",,,,0
+CGDCONT: 3,"IPV4V6","sos","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,1,,,,,,,,,,"",,,,0

None of them is activated:

AT+CGACT?
+CGACT: 1,0
+CGACT: 2,0
+CGACT: 3,0

When connecting the modem, it first register, them establish the PDP for ‘ims’, then the default PDP (the one with index=1 in +CGDCONT):

AT+CGPADDR=1
+CGPADDR: 1,"10.101.0.100"

AT+CGPADDR=2
+CGPADDR: 2,"32.1.0.0.0.0.0.1.0.0.0.0.0.0.0.5"

I would like to control it, defining, for example, that just the first PDP should get requested and established, but I get an error:

AT+CGACT=1,1
+CME ERROR: 100

No reference for ‘CME ERROR: 100’ in AT Command documentation. Does someone know what does it mean?
It is possible to control which PDP to activate?

Br. Stefano

2

Dear @sbertuola
CME ERROR: 100 is unknown error.
Before activate, please check if it is activated or not.

3

@silvia, the CME ERROR 100 is generated when trying to activate the related PDP. Not possible to activate any PDP and control them; in any case, when connecting, the modem is first enabling the ‘ims’ PDP, then the ‘default’ one.

4

Through this log, the modem has automatically completed the PDP activation and obtained the IP address. Therefore, you don’t need to use the AT command to activate the PDP again

5

@herbert.pan-Q, the question here is how to control which PDP should be activated when starting the modem and which not. It looks there is not control on PDP activation/deactivation. For example, I would like to disable DNN=‘ims’, but it looks I cannot. And, if this PDP is not successful, them the other one (DNN ‘default’) establishment is not happening.

6

Dear @sbertuola
It has default one, you can try after power on and didn’t activate any PDP , then check PDP activation status.
Before activate PDP, it is better to confirm whether it is activated or not.

7

Dear @silvia, it doesn’t matter what is defined with +CGACT, the behavior is always the ‘default’ one. Even if, for example, PDP=1 is disabled, the modem will request the connection for it. Furthermore, in most of the cases, when trying to enable/disable the PDP with +CGACT command, ERROR message is returned.

AT+CFUN=1
OK

+CPIN: READY
+QUSIM: 1
+QIND: SMS DONE
+QIND: PB DONE

AT+CGACT?
+CGACT: 1,0
+CGACT: 2,1
+CGACT: 3,0

OK
AT+CGPADDR=1
+CGPADDR: 1,"10.101.0.100"

OK
AT+CGPADDR=2
+CGPADDR: 2,"32.1.0.0.0.0.0.1.0.0.0.0.0.0.0.5"

OK
AT+CGACT=1,1
ERROR
8

Dear @sbertuola
I have sent the latest firmware to your email, please check and test again.

9

Hi @silvia, I verified and I already had installed the latest firmware version when doing the previous testing:

AT+QGMR
RG255CGLABR01A04M4G_A0.004.A0.004

I got the correct command to verify the installed firmware from another blog thread, since it is not documented in AT Commands Manual Version: 1.0.

10

Dear @sbertuola
Sorry, I don’t get your point.
Did it have the same behavior? What is AT commands you mentioned?

11

Sorry @silvia, my message was not clear. I was looking for the AT command to verify firmware version in my modem, but I couldn’t find it in the documentation; I got it (AT+QGMR) in another post.

Anyway, verifying the firmware version of my modem is already the latest one; I didn’t need to perform any upgrade.