I am not sure if this community is intended for my question.
I am using a SIM7080 modem to connect to my website using TLS with the command AT+CAOPEN and ISRG Root X1, I get an error 26: Certificate's common name does not match and time expired. Using a browser to communicate over HTTPS with my website works perfectly well. Also no problems in opening port 80 without TLS or port 443 with TLS encryption only and no certificate verification.
If I use google's root certificate and the same command to connect to google.com it works perfectly well. If I try to connect to lencr.com using the Let's Encrypt root I also get above error. If I deliberately use ISRG Root X1 to connect to google.com, I also get error 26. So this error means: there is something wrong with your certificate in general.
I suspect it has something to do with the combination of the SIM7080 TLS implementation, the Let's Encrypt certificate and probably the need to configure something in the modem that I missed.
Has anyone succeeded in using a CAOPEN command using TLS on a SIM7080 modem (or a similar SIM7000/SIM7070/SIM7090 modem)? Could you please share the full list of AT commands?
Has anyone suggestions in what I am missing in the SIM7080 - Let's Encrypt certificate combination in setting op an TLS authenticated connection?
Thanks a lot! Jeroen