SIM7000G HTTPS certificate validation

Hi guys,

I have an issue with the HTTPS functions on the SIM7000G module, especially with the certificate validation.

These are my at commands:

AT+CSSLCFG=convert,2,ca.crt
OK
AT+CSSLCFG=“sslversion”,1,3
OK
AT+SHSSL=1,“ca.crt”
OK
AT+SHCONF=“URL”,“https://node02.myqtthub.com
OK
AT+SHCONF=“BODYLEN”,1024
OK
AT+SHCONF=“HEADERLEN”,350
OK
AT+SHCONF=“IPVER”,0
OK
AT+SHCONF=“TIMEOUT”,30
OK
AT+SHCONN
ERROR

When I do this without certificate validation eg AT+SHSSL=1,"" it will succeed.
I have checked the certificate chain with Certificate Checker - Verify and Decode Intermediate Certificates | KeyCDN Tools and the chain is valid.

It seems a lot of people have issues related to this, but I can’t find a good solution.

I am using the 1529B05SIM7000G firmware.