AT#SMTPCFG?
Returns the current settings in the format:
#SMTPCFG:<ssl_enabled>,<port>,<mode>,0,0,<cid><CR><LF>
AT#SMTPCFG=?
Returns the supported range of parameters <ssl_enabled>, <port>, <mode> in the format:
#SMTPCFG:(list of supported<ssl_enabled>s),(list of supported <port>s), (list of
supported <mode>s), (0), (0), (0)