BG96 MQTT Error

Vivek_Kaloliya · February 12, 2020, 1:43pm

Hi,

I am working on BG96 module and i am executing MQTT commands.

I have received error “+QMTSTAT: 2,1” which mean connection closed or reset by peer at time of executing "AT+QMTCONN=2,“bg96"” this command.

I am also executing “AT+QMTOPEN=2,******************-ats.iot.us-east-1.amazonaws.com,8883” commands and in that i am getting response “+QMTOPEN: 2,0”

Any idea how to solve this ?

Thanks

Stephen.Li-Q · February 14, 2020, 1:13pm

Hi vivek,

“AT+QMTCONN=2,“bg96”” is not right cmd . hostname means server name
+QMTOPEN: 2,0” , this means that connection is sucessful.

3 for the detail,pls refer to the doc of Quectel_BG96_MQTT_Application_Note_V1.1.pdf

pls pay more attention to the example of AWS in chapter 6.1

Vivek_Kaloliya · February 17, 2020, 1:36pm

Hi,

Thank you for helping me out on this problem.
I have gone through the documentatation again, and I am still stuck with this problem.

To elaborate my problem in detail, here is my sequence of at commands:

AT+QMTCFG=”SSL”, 0, 1, 2
AT+QFUPL=“ufs:cacert.pem”,1423,100
AT+QFUPL=“ufs:client.pem”,1220,100
AT+QFUPL=“ufs:user_key.pem”,1679,100
AT+QSSLCFG=“cacert”,2,“ufs:cacert.pem”
AT+QSSLCFG=“clientcert”,2,“ufs:client.pem”
AT+QSSLCFG=“clientkey”,2,“ufs:user_key.pem”
AT+QSSLCFG="seclevel”,2,2
AT+QSSLCFG="sslversion”,2,4
AT+QSSLCFG="ciphersuite”,2,0XFFFF
AT+QSSLCFG=“ignorelocaltime”,1

After this if I send following command:
AT+QMTOPEN=0, “****.iot.us-east-1.amazonaws.com”,8883
it failes to connect with response: +QMTOPEN: 0,-1

Now if I change index in open command to 2,
AT+QMTOPEN=2, “****.iot.us-east-1.amazonaws.com”,8883
it is able to open connection with response +QMTOPEN: 2,0

After this I send connection command as follows:
AT+QMTCONN=2,“GateWay”

it resonses with +QMTSTATE: 2,1

Please let me know which step I am doing wrong here.

Thanks in advance

parthraj · March 20, 2020, 11:44am

The problem is while you upload the aws certificates to bg96, make sure you add “\r\n” at the end of the each line.
This solves the issue.

nero · September 17, 2020, 3:51am

Hi,

The \n is at end of each line when donwload the certificates from aws, so if add “\r\n”, it should be \n\r\n at end of each line? Below is the orignal certificates, it has \n at each line.

cyril.dominguez · September 5, 2024, 8:39am

Hello,

Do you find the solution ?
I am facing the same problem and my certificates format are ok (with \r\n) , i receive +QMTOPEN = 0,0
but just after +QMTSAT=0,1

It will be very helpfull.

Thanks