RG520N-EU - Unable to Open a TCP connection

IoT Modules 5G Module
1

Hello,

I’m working on a 5G Quectel module, RG520N-EU TE-A, connected to RTA001-EV EValuationBoard.
I can correctly configure and activate the PDP context, but when I’m trying to open a TCP connection, the module returns error 566 (socket connect failed).
I’m using a 5G vodafone SIM.

Here is the sequence of AT commands:

AT+CREG?
+CREG: 0,1

OK
AT+QICSGP=1,1,“mobile.vodafone.it”,“”,“”
OK
AT+QIACT=1
OK
AT+QIOPEN=1,0,“TCP”,“X.X.X.X”,15000
OK

+QIOPEN: 0,566
AT+QIOPEN=1,1,“TCP”,“8.8.8.8”,80
OK

+QIOPEN: 1,566

errcode 566: Socket connect failed (from Application Note)

The IP “X.X.X.X” is obviously a public and working TCP server IP.
How can I estabilish the connection?
Thx in advance!

2

please run

AT+C5GREG?
AT+CGDCONT?
AT+CGPADDR
AT+QPING=1,8.8.8.8

1 Like
3

Thanks!
Log:

AT+CREG?
+CREG: 0,1

OK
AT+CEREG?
+CEREG: 0,1

OK
AT+C5GREG?
+C5GREG: 0,0

OK
AT+QICSGP=1,1,“mobile.vodafone.it”,“”,“”,0
OK
AT+QIACT=1
OK
AT+CGDCONT?
+CGDCONT: 1,“IP”,“mobile.vodafone.it”,“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”,“hos”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0,“”,0
+CGDCONT: 4,“IPV4V6”,“sos”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,1,“”,0
+CGDCONT: 5,“IPV4V6”,“web.vodafone.de”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0,“”,0

OK
AT+CGPADDR
+CGPADDR: 1,“100.104.42.180”
+CGPADDR: 2,“0.0.0.0”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”
+CGPADDR: 3,“0.0.0.0”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”
+CGPADDR: 4,“0.0.0.0”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”
+CGPADDR: 5,“0.0.0.0”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”

OK
AT+QPING=1,8.8.8.8
ERROR

In addition:

AT+QNWINFO
+QNWINFO: “FDD LTE”,“22210”,“LTE BAND 3”,1850

OK
AT+QENG=“servingcell”
+QENG: “servingcell”,“NOCONN”,“LTE”,“FDD”,…
AT+COPS?
+COPS: 0,0,“vodafone IT”,13

OK

4

The device has successfully registered on the LTE network

The device also has obtained the network IP address

Can’t complete PING, very strange

5

Is it a problem that the sim can’t register to the 5G network? (C5GREG=0,0)
By using it with a smartphone it can register to 5G network automatically.
Do you think I can do anything to solve the ping/tcp connection problem, maybe with the AT+QNWPREFCFG series of commands for the RG520N module?

The QPING command syntax was wrong, now the answer is the following:

AT+QPING=1,“8.8.8.8”
OK

+QPING: 558

Thanks

6

Hello, at the end I’ve managed to successfully create a connection to my server by configuring and activating the second PDP context (ID: 2).
I still cannot understand why the first PDP context (ID:1) can be successfully activated but can’t be used.

7
  • I am also very curious about this question
8

Hi fgamba,

Could you share how you to configuring and activating the second PDP context (ID: 2)? I face the similar issue about this. Can get ip address from APN, but still can’t ping to network. Thanks a lot.

9

Hi Craig,

to configure PDP Context 2, just use the “AT+QICSGP” command with contextID=2;
then, activate the configured PDP context using the “AT+CGACT” command and open your TCP/UDP connection on that context with the “AT+QIOPEN” command.

Command sequence:

  • AT+QICSGP=<contextID>[,<context_type>,<APN>[,<username>,<password>)[,<authentication>]]]
  • AT+CGACT=<state>,<cid>
  • AT+QIACT=<contextID>
  • AT+QIOPEN=<contextID>,<connectID>,<service_type>,<IP_address>/<domain_name>,<remote_port>[,<local_port>[,<access_mode>]]

Example with Vodafone APN (replace APN details according to your SIM):

  • AT+QICSGP=2,1,“web.omnitel.it”,“”,“”,0 // Configure PDP context (ID: 2), i.e. set APN*
  • AT+CGACT=1,2 // activate PDP context (ID: 2)
  • AT+QIACT=2 // activate PDP context (ID: 2) – Quectel command
  • AT+QIOPEN=2,0,“UDP”,“x.x.x.x”,<local_port> // Open UDP connection (connection ID: 0) in activated PDP context (PDP context ID: 2)**
1 Like