AT#SCFGEXT3?
Read command returns the current socket extended configuration parameters
values for all the six sockets, in the format:
#SCFGEXT3: <connId1>, <immRsp1>,
<closureTypeCmdModeEnabling1>, <fastsring1>,
<lingerTime1>,<UDPSocketMode1>,<ssendTimeout1><CR><LF>
...
#SCFGEXT3: <connIdconMax>, <immRspconMax>,
<closureTypeCmdModeEnablingconMax>, <fastsringconMax>,
<lingerTimeconMax>,<UDPSocketModeconMax>,<ssendTimeoutconMax><CR><L
F>