+ # AT+JSEC=<secmode>,<linkkey_info>,<pintype>,<pinlen>,<pin>
+ # secmode: Security mode 1 or 3 (default).
+ # linkkey_info: Must be 1 or 2. Has no function according to docs.
+ # pintype: 1: variable pin (default), 2: fixed pin.
+ # pinlen: PIN length (2 decimal digits). Max. PIN length is 16.
+ # pin: The Bluetooth PIN ('pinlen' chars). Used if pintype=2.
+ # Note: AT+JSEC (if used) must be the first command after reset.
+ # TODO: Parse all the other parameters.