Problem with receiving MQTT messages in the BG96 module

IoT Modules LPWA Module
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1

Hello, I have a problem during the implementation of MQTT in the BG96 module. I establish communication with the MQTT Broker and then subscribe to a topic; During the first 5 seconds (approximately) I receive messages sent from another client, but after this time I do not receive the messages even though the communication is active.

AT+QMTOPEN=0,“test.mosquitto.org”,1883
AT+QMTCONN=0,“BG96”
AT+QMTSUB=0,1,“testtopic/mitopic”,2

2

Hi @Lera

Its hard to say without any modem log. but can you please help try with send message to MQTT server? and if server could be receive it?

4

hello @Linkin-Q

I share with you the record of the communication process with the Mosquitto broker.

[2023-11-30_16:20:13:645]AT+QPING=1,“www.google.com”
[2023-11-30_16:20:13:645]OK
[2023-11-30_16:20:14:444]
[2023-11-30_16:20:14:444]+QPING: 0,“209.85.203.105”,32,302,255
[2023-11-30_16:20:14:721]
[2023-11-30_16:20:14:721]+QPING: 0,“209.85.203.105”,32,277,255
[2023-11-30_16:20:15:069]
[2023-11-30_16:20:15:069]+QPING: 0,“209.85.203.105”,32,348,255
[2023-11-30_16:20:15:389]
[2023-11-30_16:20:15:389]+QPING: 0,“209.85.203.105”,32,320,255

[2023-11-30_16:20:15:389]+QPING: 0,4,4,0,277,348,311
[2023-11-30_16:20:20:229]AT+QMTOPEN=0,“test.mosquitto.org”,1883
[2023-11-30_16:20:20:229]OK
[2023-11-30_16:20:20:511]
[2023-11-30_16:20:20:511]+QMTOPEN: 0,0
[2023-11-30_16:20:24:726]AT+QMTCONN=0,“BG96”
[2023-11-30_16:20:24:728]OK
[2023-11-30_16:20:25:309]
[2023-11-30_16:20:25:309]+QMTCONN: 0,0,0
[2023-11-30_16:20:28:540]AT+QMTSUB=0,1,“testtopic/luis/tass2”,2
[2023-11-30_16:20:28:540]OK
[2023-11-30_16:20:28:840]
[2023-11-30_16:20:28:840]+QMTSUB: 0,1,0,2
[2023-11-30_16:20:31:712]
[2023-11-30_16:20:31:712]+QMTRECV: 0,1,“testtopic/luis/tass2”,"Hello world "
[2023-11-30_16:20:33:318]
[2023-11-30_16:20:33:318]+QMTRECV: 0,2,“testtopic/luis/tass2”,"Hello world "
[2023-11-30_16:20:36:524]
[2023-11-30_16:20:36:524]+QMTRECV: 0,3,“testtopic/luis/tass2”,"Hello world "

5

After the last message, the modem does not receive messages. This problem occurs only when I connect to LTE networks