Mqtt client Nrf9160 Module

[Ukhan]

My nrf9160 isn't responsive to the AT commands for MQTT mentioned here. I want to know why is that so?
I've put certificates in the module from AWS-Iot core and flashed at_client example inside the nrf9160 and trying to send AT#XMQTTCON command to connect it to the broker. 

Am I missing something or Is this a work in progress and these commands aren't available yet? 
I want to make use to this mqtt client to connect to AWS-IoT instead of doing in in the application, I suppose that'll be possible as well.

here in or at this place; where the speaker or writer is More (Definitions, Synonyms, Translation)

[Øyvind]

Hello,

First of all, what version of NCS are you working on?

 flashed at_client example inside the nrf9160 and trying to send AT#XMQTTCON command to

Have you tried with the Serial LTE modem application? The MQTT AT command is only available in this application. 

Edit: For AT commands that work with the AT client, please see the AT Commands documentation.

Kind regards,
Øyvind

[Ukhan]

NCS: v1.4.99, I suppose this is the latest.

I tried with Serial LTE modem application as well. 
Following the documentation, I send 

AT#XMQTTCON=0,"nrf91","","","myAWSendpoint.com",8883,123

ERROR

On nrf connect desktop app I can see that signal strength is fine and the module is awake as well. 

One weird thing is that on AWS-IoT core I can see that a connection was established in the Manage section where it shows connections graph.

[Ukhan]

Correct me if I am wrong but in the code the macro AT_MQTTCON_CONNECT is set to 1 while in the documentation it says 

AT#XMQTTCON=<op>[,<client_id>,<username>,<password>,<url>,<port>[,<sec_tag>]]

• The <op> parameter is an integer. It can accept one of the following values:

  • 0 - Connect to the MQTT broker.

  • 1 - Disconnect from the MQTT broker.

That seems to be contradictory. I debugged and it seemed to hit the connect case AT_MQTTCON_CONNECT case only when 1 was sent. And then it polls for CONACK where it returns error.

So basically this is happening on nrf Connect

[Øyvind]

Hello, 

Yes, you are correct. There seems to be a bug in the documentation which I will report. This also explains the ERROR you received in your last comment.

The MQTTEVT reports -128, which means "Socket is not connected".

[Ukhan]

Could you explain how do I fix that? Do I need to issue a different at command before that?
I was assuming all of this will be handled in the slm application.