EXS82-W A2.4 receives data from MQTT only once | Telit Cinterion IoT Developer Community

I have the following Modules:

1 - EXS82-W B2.1
2 - EXS82-W A2.4

I am trying to communicate using MQTT.

I can connect fine to the mqtt.eclipse.org broker, I get the connected messages and etc...

I am subscribing on two topics:

AT^SISS=1,TopicFilter,"hee9999/switch;hee9999/profile"

When I am using the module EXS82-W B2.1, it works fine, beautifully.
I can receive the messages that are written to the topics (both of them) just fine.

^SIS: 1,0,3488,"topic=hee9999/switch; bytes=4"

^SIS: 1,0,3488,"topic=hee9999/switch; bytes=7"

^SIS: 1,0,3488,"topic=hee9999/switch; bytes=12"

However, in the second module, the EXS82-W A2.4, only one message arrives at the module.

^SIS: 1,0,3488,"topic=hee9999/switch; bytes=4"

I can read the message just fine with the SISR. However, if I keep writing to the topic from my client app (on my smartphone), the messages do not reach the module anymore.

So, my conclusion is:

- EXS82-W A2.4 has some problem with MQTT;

- EXS82-W B2.1 works just fine.

P.S.: I have 3 pieces of the A2.4, and all of them have the same issue.

I have only 1 piece of the B2.1 with me.

Thank you!