nRF9161 with MQTT Client in SLM

[dingoxx]

Hello

We are using a slave processor with AT command to communicate with the nRF9161 . This is working without problem

But we are initially using the Quick Start 0.2.7 (9161) to evaluate and understand the AT Commands

We are having a problem connecting to our normal MQTT Brokers . 

Ready
> at

OK
> AT+CGDCONT?

OK
>
> AT+CFUN=1

OK
> AT%XCONNSTAT=1

OK
> AT+CGDCONT?

+CGDCONT: 0,"IP","iot.1nce.net","10.XX.129.2",0,0

OK
> AT+CGMR

mfw_nrf91x1_2.0.1

OK
> AT%XSYSTEMMODE?

%XSYSTEMMODE: 1,1,1,3

OK

--------------------

The 

AT#XCLAC command returns

AT#XMQTTCFG

AT#XMQTTCON

AT#XMQTTPUB

AT#XMQTTSUB

AT#XMQTTUNSUB

So we are assuming that the MQTT Client is available within the nRF9161 firmware we are running

Configure the MQTT Client ID

> AT#XMQTTCFG="Wiska_Air",300,1

OK
> AT#XMQTTCFG?

#XMQTTCFG: "Wiska_Air",300,1

OK

The MQTT Connect Command does not give any reply and the nRF9161dk has to be reset

> AT#XMQTTCON=1,"mqttgateway”,”42Gears@123",”mqttbrokerstage.42gears.com",1890
> at
> at

Thank you for your help

Paul H

[Michal]

Hello Paul,

What is your NCS version? What about Modem FW?

Are you able to connect to the network and the internet? Did you try for example our HTTPS client or MQTT samples first?

Did you add a certificate to your device if required for your MQTT broker?

Best regards,

Michal

[dingoxx]

Hello Michal

I am using Nordic Quickstart for the nRF9161 and selecting nRF9161 and Serial LTE Modem.

The nRF9161dk is then programmed over the USB

> AT#XSLMVER

#XSLMVER: "2.7.0-rc3","2.7.0-cellular-28f48961a8dc"

OK

OK
> AT+CGMR

mfw_nrf91x1_2.0.1

The nRF9161 connects OK and an IP address is returned

OK
> AT+CGDCONT?

+CGDCONT: 0,"IP","iot.1nce.net","10.XX.129.2",0,0

All Good - Now connect to a pulblic MQTT Server (with no username or password)

> AT#XMQTTCFG="MyMQTT-Client-ID",300,1

OK
> AT#XMQTTCON=1,"","","broker.emqx.io",1883

OK

#XMQTTEVT: 0,0

All Good - Now disconnect

> AT#XMQTTCON=0

#XMQTTEVT: 1,0

OK

All Good - Now try our MQTT Server which is OFFLINE

> AT#XMQTTCFG="Wiska_Air",300,1

OK
> AT#XMQTTCFG?

#XMQTTCFG: "Wiska_Air",300,1

OK

All Good - Configuration is OK - Now try to connect to offline MQTT Broker

> AT#XMQTTCON=1,"mqttgateway”,”xxxxxxxxxxxxxxxx",”mqttbrokerstage.42gears.com",1890

nRF9161 issues no serial response - will accept no other AT serial command - Reset Button has to be pressed

Starting again with a MQTT broker that is ONLINE (tested 5 minutes ago with Quectel)

> AT#XMQTTCFG="89882280666127879587",300,1

OK
> AT#XMQTTCFG?

#XMQTTCFG: "89882280666127879587",300,1

OK

All Good - Configuration is OK - Now try to connect to ONLINE MQTT Broker

> AT#XMQTTCON=1,"89882280666127879587”,”xxxxxxxxxxxxxx",”iris-mqtt.trackpac.io",1883
>

nRF9161 issues no serial response  - will accept no other AT serial command - Reset Button has to be pressed

Thank You for your assistance

Paul H

[Michal]

Hello Paul,

We'll look into it internally and I will get back to you before the end of the week.

Best regards,

Michal

[Michal]

Do you have any public brokers you could reproduce this issue against?

Or a test account for us to try?

[dingoxx]

Hello

You can use the following commands on your nRF9161dk board with our MQTT Broker and see if you have the same problem on the second command

AT#XMQTTCFG="89882280666127879587",300,1

AT#XMQTTCON=1,"89882280666127879587”,”REtYPtiOnStI",”iris-mqtt.trackpac.io",1883

Thank You

Paul H

[Michal]

Hello Paul,

I think we have found the issue.

Looks like the reason is that in failure commands curly double quote ” is used instead of straight double quote ".

AT#XMQTTCON=1,"mqttgateway”,”xxxxxxxxxxxxxxxx",”mqttbrokerstage.42gears.com",1890

Best regards,

Michal