Issue with connection with specific SIM Card | Telit Cinterion IoT Developer Community

Hi,

I have one issue with a specific scenario here with the APP I developed.

The app basically executes these steps:
1 - setup the connection via AT commands;
2 - execute a Ping test to validate the connection;
3 - initalize the DSS qapi connection;
4 - starts the DSS qapi via qapi_Start_Datacall();
5 - starts the MQTT Qapi connection;
6 - starts the publish/subscribe;

I have two different SIM Cards at hand here:

1 - SIM Card A: which is from an IoT Broker;
2 - SIM Card B: which is my personal smartphone sim card.

The issue:

If I use the SIM Card A, my APP works up to step (4) above.
If I use the SIM Card B, my APP works fine until step (6) above.

Looking at the source code, it is returining the NOCONN state when using QAPI functions.
The code is very similar to the one in SDK/examples/mqtt/mqtt.c in the steps about how to start a data call using the QAPI DSS functions.

The callback when the DSS is started is informing that there is NOCONN, although the AT commands are telling me that the APP is working fine (and pinging to 8.8.8.8 google).

Here are the logs when I run the APP using SIM Card A:

0:00:13:284 CRIT:dss.c,661: (((dss_init)))
00:00:13:287 CRIT:dss.c,143: dss_apn_install)--->
]0:00:13:289 CRIT:at_hdl.c,106: writting 26, =[AT^SGAUTH=1,1,******,*****
00:00:13:301 CRIT:at_hdl.c,138: Received 6, =[
OK
]
00:00:13:303 CRIT:at_hdl.c,146: @@@ MATCH
]0:00:13:306 CRIT:at_hdl.c,106: writting 41, =[AT+CGDCONT=1,"IPV4V6","******"
00:00:13:316 CRIT:at_hdl.c,138: Received 6, =[
OK
]
00:00:13:318 CRIT:at_hdl.c,146: @@@ MATCH
]0:00:13:320 CRIT:at_hdl.c,106: writting 24, =[AT^SGAUTH=2,1,*****,******
00:00:13:331 CRIT:at_hdl.c,138: Received 6, =[
OK
]
00:00:13:333 CRIT:at_hdl.c,146: @@@ MATCH
]0:00:13:335 CRIT:at_hdl.c,106: writting 40, =[AT+CGDCONT=2,"IPV4V6","******X"
00:00:13:345 CRIT:at_hdl.c,138: Received 6, =[
OK
]
00:00:13:347 CRIT:at_hdl.c,146: @@@ MATCH
]0:00:13:351 CRIT:at_hdl.c,106: writting 14, =[AT^SXRAT=12,7
00:00:13:378 CRIT:at_hdl.c,138: Received 6, =[
OK
]
00:00:13:381 CRIT:at_hdl.c,146: @@@ MATCH
00:00:13:383 CRIT:dss.c,574: dss_init_autoconnect)--->
]0:00:13:412 CRIT:at_hdl.c,106: writting 10, =[AT+COPS=2
00:00:13:956 CRIT:at_hdl.c,138: Received 6, =[
OK
]
00:00:13:959 CRIT:at_hdl.c,146: @@@ MATCH
]0:00:13:961 CRIT:at_hdl.c,106: writting 14, =[AT^SXRAT=12,7
00:00:13:987 CRIT:at_hdl.c,138: Received 6, =[
OK
]
00:00:13:989 CRIT:at_hdl.c,146: @@@ MATCH
00:00:13:991 CRIT:dss.c,366: dss_cops_zero)--->
]0:00:13:994 CRIT:at_hdl.c,106: writting 10, =[AT+COPS=0
00:00:15:375 CRIT:at_hdl.c,138: Received 6, =[
OK
]
00:00:15:377 CRIT:at_hdl.c,146: @@@ MATCH
00:00:15:379 CRIT:dss.c,515: dss_smoni)--->
]0:00:15:382 CRIT:at_hdl.c,106: writting 9, =[AT^SMONI
00:00:15:506 CRIT:at_hdl.c,138: Received 81, =[
^SMONI: Cat.M1,9610,28,-,FDD,******X,******,******,******,******,--,-78,-10,CONN,-4

OK
]
00:00:15:508 CRIT:at_hdl.c,146: @@@ MATCH
00:00:15:510 CRIT:dss.c,425: dss_smoni_parse_status)--->
00:00:15:513 CRIT:dss.c,446: STATE CONN CAT M1
00:00:15:515 CRIT:dss.c,475: CONN ANCHOR
00:00:15:517 CRIT:dss.c,279: dss_sica)--->
]0:00:15:519 CRIT:at_hdl.c,106: writting 12, =[AT^SICA=1,1
00:00:17:548 CRIT:at_hdl.c,138: Received 6, =[
OK
]
00:00:17:551 CRIT:at_hdl.c,146: @@@ MATCH
00:00:17:553 CRIT:dss.c,610: .
00:00:17:555 CRIT:dss.c,317: dss_ping)--->
]0:00:20:585 CRIT:at_hdl.c,106: writting 34, =[AT^SISX="Ping",1,"8.8.8.8",1,5000
00:00:20:690 CRIT:at_hdl.c,138: Received 95, =[
^SISX: "Ping",1,1,"8.8.8.8",93
^SISX: "Ping",2,1,1,1,0,0
^SISX: "Ping",3,1,93,93,93

OK
]
00:00:20:692 CRIT:at_hdl.c,146: @@@ MATCH
00:00:20:695 CRIT:dss.c,617: .
00:00:20:697 CRIT:dss.c,627: dss_netctrl_init)--->
00:00:20:699 CRIT:dss.c,171: dss_set_pdp_params)--->
00:00:20:702 CRIT:mod.c,106: (((STATE DSS CONNECT)))
00:00:20:704 CRIT:dss.c,699: dss_start_datacall)--->
00:00:20:711 CRIT:mod.c,149: (((STATE CHECK EVENTS)))
00:00:20:788 CRIT:dss.c,50: FLAG SET CONN_SIG_EVT_NOCONN_EVENT
00:00:20:788 CRIT:dss.c,53: Event IS NO NET
00:00:20:795 CRIT:events.c,55: NOCONN_EVENT
00:00:20:797 CRIT:mod.c,115: (((STATE DSS FAILED CONNECT)))
00:00:20:799 CRIT:dss.c,712: dss_stop_datacall)--->