EC25 - open PDP context failed

Hi Kyson.

I want to TCP Client Connection.

[2020-04-01 17:08:59:484_R:] AT+QIOPEN=1,0,“TCP”,“ip_adress”,21,0,1
[2020-04-01 17:08:59:484_R:] OK

[2020-04-01 17:08:59:737_R:] +QIOPEN: 0,561

561 error code : Open PDP context failed

Did I miss any steps?

Dear Sera,
Thanks for your inquiry in Quectel forum.
Before you open the TCP connection, whether you set APN and activate the PDP context ? Please make sure you already active the PDP successful before you open the connection. Thanks!


Quectel_EC2x&EG9x&EM05_TCP(IP)_AT_Commands_Manual_V1.0.pdf (515.7 KB)

Dear Kyson

I try to set APN and activate the PDP context
I entered the command repeatedly and reboot my module…
I failed about AT+QIACT=1
So I try to change PDP context 2,3,4
All failed.

[2020-04-01 18:29:19:698_S:] AT+QICSGP=1,1,“SKTelecom”,"","",1
[2020-04-01 18:29:19:705_R:] AT+QICSGP=1,1,“SKTelecom”,"","",1
[2020-04-01 18:29:19:707_R:] OK
[2020-04-01 18:29:27:405_S:] AT+QIACT=1
[2020-04-01 18:29:27:411_R:] AT+QIACT=1
[2020-04-01 18:29:27:612_R:] ERROR
[2020-04-01 18:29:36:747_S:] AT+QIACT?
[2020-04-01 18:29:36:754_R:] AT+QIACT?
[2020-04-01 18:29:36:759_R:] OK
[2020-04-01 18:29:47:688_S:] AT+QIDEACT=1
[2020-04-01 18:29:47:693_R:] AT+QIDEACT=1
[2020-04-01 18:29:47:695_R:] OK
[2020-04-01 18:29:55:329_S:] AT+QIACT=1
[2020-04-01 18:29:55:334_R:] AT+QIACT=1
[2020-04-01 18:29:55:530_R:] ERROR
[2020-04-01 18:30:00:702_S:] AT+QIACT?
[2020-04-01 18:30:00:711_R:] AT+QIACT?
[2020-04-01 18:30:00:714_R:] OK
[2020-04-01 18:30:06:840_S:] AT+QIDEACT=1
[2020-04-01 18:30:06:847_R:] AT+QIDEACT=1
[2020-04-01 18:30:06:849_R:] OK
[2020-04-01 18:30:11:922_S:] AT+QIACT=1
[2020-04-01 18:30:11:928_R:] AT+QIACT=1
[2020-04-01 18:30:12:119_R:] ERROR
[2020-04-01 18:30:17:562_S:] AT+QIACT?
[2020-04-01 18:30:17:569_R:] AT+QIACT?
[2020-04-01 18:30:17:572_R:] OK
[2020-04-01 18:30:28:472_S:] AT+QIDEACT=1
[2020-04-01 18:30:28:479_R:] AT+QIDEACT=1
[2020-04-01 18:30:28:482_R:] OK
[2020-04-01 18:30:28:776_S:] AT+QIDEACT=1
[2020-04-01 18:30:28:780_R:] AT+QIDEACT=1
[2020-04-01 18:30:28:782_R:] OK
[2020-04-01 18:53:18:792_S:] AT+QICSGP=2,1,“SKTelecom”,"","",1
[2020-04-01 18:53:18:797_R:] AT+QICSGP=2,1,“SKTelecom”,"","",1
[2020-04-01 18:53:18:811_R:] OK
[2020-04-01 18:53:27:069_S:] AT+QIACT=2
[2020-04-01 18:53:27:074_R:] AT+QIACT=2
[2020-04-01 18:53:27:269_R:] ERROR
[2020-04-01 18:54:15:981_S:] AT+QICSGP=3,1,“SKTelecom”,"","",1
[2020-04-01 18:54:15:988_R:] AT+QICSGP=3,1,“SKTelecom”,"","",1
[2020-04-01 18:54:15:991_R:] OK
[2020-04-01 18:54:23:535_S:] AT+QIACT=3
[2020-04-01 18:54:23:542_R:] AT+QIACT=3
[2020-04-01 18:54:23:760_R:] ERROR
[2020-04-01 18:54:26:845_S:] AT+QIDEACT=3
[2020-04-01 18:54:26:851_R:] AT+QIDEACT=3
[2020-04-01 18:54:26:854_R:] OK
[2020-04-01 18:55:01:706_S:] AT+QICSGP=4,1,“SKTelecom”,"","",1
[2020-04-01 18:55:01:712_R:] AT+QICSGP=4,1,“SKTelecom”,"","",1
[2020-04-01 18:55:01:727_R:] OK
[2020-04-01 18:55:07:138_S:] AT+QIACT=4
[2020-04-01 18:55:07:144_R:] AT+QIACT=4
[2020-04-01 18:55:07:359_R:] ERROR
[2020-04-01 18:55:09:934_S:] AT+QIDEACT=4
[2020-04-01 18:55:09:944_R:] AT+QIDEACT=4
[2020-04-01 18:55:09:948_R:] OK

Dear Sera,
Please check the firmware you used now with ATI command.
You use SKT sim card, right ? If yes, please use the right firmware than have get SKT certificate. Thanks!