MQTT Connection Fail

[najabhaider96]

Hi,

I'm using SIM7000C and successfully run HTTP request on NB-IoT now I'm trying to connect with MQTT broker. I have 2 MQTT Brokers one is IBM Watson IoT Platform and second one is CloudMQTT. In both brokers I'm failing every time to connect MQTT connection on AT+SMCONN command. All commands runs successfully according to response but on this command It always return ERROR.

Here is my commands with responses. AT+CSQ +CSQ: 27,99

OK

AT+CGDCONT=1,"IP","APN" OK

AT+CNACT=1,"APN" OK

AT+CNACT? +CNACT: 1,"xx.xx.xx.xx"

OK

AT+SMCONF="URL","HOST:PORT" OK

AT+SMCONF="CLIENTID","clientname" OK

AT+SMCONF="USERNAME", "username" OK

AT+SMCONF="PASSWORD", "password" OK

AT+SMCONN // This always return ERROR in both MQTT brokers. ERROR

Please help me to resolve this issue or if any suggestions please tell me.

Thank You

[najabhaider96]

Hi,

When I used this https://www.emqx.io/mqtt/public-mqtt5-broker public MQTT Broker with these set of commands without any Username and Password it worked for me. But I can't use this in my production I don't have any option to use any broker without Username and Password authentication in my production. :(

Here is my commands with responses. AT+SMSTATE? +SMSTATE: 0 OK

AT+CSQ +CSQ: 22,99

OK

AT+CGDCONT=1,"IP","APN" OK

AT+CNACT=1,"APN" OK

+APP PDP: ACTIVE

AT+SMCONF="URL","broker.emqx.io:1883" OK

AT+SMCONF="CLIENTID","Device001" OK

AT+SMCONF? +SMCONF

CLIENTID: "Device001" URL: broker.emqx.io:1883 KEEPTIME: 60 USERNAME: "" PASSWORD: "" CLEANSS: 0 QOS: 0 TOPIC: "" MESSAGE: "" RETAIN: 0

OK

AT+SMCONN OK

AT+SMSUB="update",1 OK

AT+SMPUB="update","5",1,1

hello

OK

+SMSUB: "update","hello"

AT+SMPUB="update","8",1,1

HI Najaf

OK

+SMSUB: "update","HI Najaf"

[jatayu86]

@najabhaider96 i face the similar issue, did you find a resolution for this?

[psiborg99]

15:04:28.697 -> AT+SMCONF="URL","(mqtt broker url here):1883" 15:04:28.739 -> ERROR

I wrote an code for sending data to mqtt but it was not working now i tried doing it with at commands still it throws error i am using SIM800L and rp2040 as host

[najabhaider96]

Please share your code

On Wed, 27 Mar 2024, 2:36 pm psiborg99, @.***> wrote:

15:04:28.697 -> AT+SMCONF="URL","(mqtt broker url here):1883" 15:04:28.739 -> ERROR

I wrote an code for sending data to mqtt but it was not working now i tried doing it with at commands still it throws error i am using SIM800L and rp2040 as host

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