I can successfully open an ssl socket with this: AT#SSLSECCFG,1,0,1,1 (using loaded PEM certificates)
I cannot successfully open an ssl socket with DER format specified: AT#SSLSECCFG,1,0,1,0 (using loaded DER certificates)
Can you please confirm whether or not DER formats are supported for this product/firmware configuration?
The documentation in Sect. 3.2 and Sect 3.3 of the SSL/TLS User Guide Rev.10 (2015-04-07) appears to state that they are not.
Yes, your SW version (12.00.026) should support both formats (DER and PEM). If it would not support it, setting the ‚cert_format‘ parameter in AT#SSLSECCFG, should result in an error.
If in both formats the certificate is the same, the DER format should work as well, of course if AT#SSLSECDATA=1,1,1,x replied correctly with an OK. However, we suggest the use of PEM files, because some terminal emulators have issues with binary files. The DER certificate is a binary file and some terminals can interpret part of the certificate data as control characters. Therefore, the integrity of this binary file is not preserved and the certificate becomes invalid.
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