SIM7070G does not connect to AWS IoT with MQTT

I have purchased a SIM7070G module recently. I am trying to connect to AWS IoT using MQTTS but it doesn’t seem to be working. Normal MQTT without SSL works just fine.

My current firmware version is 1951B08SIM7070.

Just to mention SIM7000 seem to have same set of AT commands and a similar problem.

Please check the AT Commands below and let me know if there is a problem.

AT+CNACT=0,1
OK

+APP PDP: 0,ACTIVE

AT+SMCONF=“URL”,“XXXXXXXXX-ats.iot.ap-south-1.amazonaws.com”,8883 (commented out by X for security reasons)
OK

AT+SMCONF=“QOS”,1
OK

AT+SMCONF=“CLEANSS”,1
OK

AT+SMCONF=“CLIENTID”,“sim7070”
OK

AT+CSSLCFG=convert,2,“clientca.pem” (ALL certificates that I am using here are stored in filesystem with same filename and extension)
OK

AT+CSSLCFG=convert,1,“clientcert.pem”,“clientkey.pem”
OK

AT+CSSLCFG=“sslversion”,0,3
OK

AT+SMSSL=1,“clientca.pem”,“clientcert.pem”
OK

AT+SMCONN
ERROR

Thank you.

I am facing the same issue for 7080G.
@DarshanDodal were you able to get it working?

Thanks,
Saheblal bagwan

I believeThe ClientCA should be the AMazoneRootCA1 or AMazoneRootCA3, not the client certificate CA.

Howerver, i also can’t seem to get it working on the B12 release version.
I get a long timeout of about 205ish seconds when calling AT+SMCONN