BG96 MQTT Error on executing connect request

IoT Modules LPWA Module
1

Hi,

I have BG96 modem and am trying to establish Azure connection over MQTT.
I have executed below AT commands,

AT+CGATT=1
OK
AT+QICSGP=1,1,"live.vodafone.com","","",0
OK
AT+CGREG?
+CGREG: 0,1

OK
AT+QIACT=1
OK
AT+QIDNSCFG=1
+QIDNSCFG: 1,"10.169.30.245","10.169.30.244"

OK
AT+QIACT?
+QIACT: 1,1,1,"10.188.26.104"

OK
AT+QMTOPEN=1,"waterfall.azure-devices.net",8883
OK

+QMTOPEN: 1,0
AT+QMTCONN=1,"Test","abc.azure-devices.net/Test?api-version=2018-06-30","SharedAccessSignature sr=abc.azure-deviceset%2Fdevices%2FTest&sig=mo4avM89v4%2F688utBgp0PMnTR%2F4Ewuzup0aJkDrh52A%3D&"
OK

+QMTSTAT: 1,1

As you can see, everytime I try to connect I am getting QMTSTAT as disconnecte. I am executing this command within 10s of open request.

Please help me how to establish connection to azure.

2

AT+QMTCFG=“ssl” ?

and are you sure for your SAS pasword?

3

Hi,

Below are full commands,
AT+CGATT=1
OK
AT+QICSGP=1,1,“live.vodafone.com”,"","",0
OK
AT+CGREG?
+CGREG: 0,1

OK                                      
AT+QIACT=1                              
OK                                      
AT+QIACT?                               
+QIACT: 1,1,1,"10.188.26.104"
OK
AT+QSSLCFG="ignorelocaltime",1,1
OK
AT+QSSLCFG="seclevel",2,0
OK
AT+QMTCFG="SSL",1,0
OK
AT+QMTOPEN=1,"abc.azure-devices.net",8883
OK

+QMTOPEN: 1,0
AT+QMTCONN=1,"Test","abc.azure-devices.net/Test?api-version=2018-06-30","SharedAccessSignature sr=abc.azure-devices.net/devices/Test&sig=L6E4gvMu0GXQU0Z5eXgRY8qnumv7Z5ntEf4djx5bsgQ%3d&se=1585716616"
OK
+QMTSTAT: 1,1
4

Darshan, are you still experiencing this issue with AzureIOTHUB and BG96 MQTT?

I am seeing the same results. Having triple checked everything the only difference I can only see between our two attempts are the absence of a “/” between the deviceId and the api-version=2018-06-30 in the username field.

I will let you know what solved this when I get it, please do the same if you find the solution first.

Thanks,
Greg

5

I found my issue, posting it here if it might help others.

Microsoft documentation says IoTHub is MQTT v3.1.1 on port 8883 (see https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-mqtt-support). There is a stackoverflow post (https://stackoverflow.com/questions/54115152/azure-iot-hub-mqtt-failure) that suggested the need to force the BG96 MQTT v4.

AT+QMTCFG=“version”,0,4

Making that change and the connect succeeds.

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