===== KWP KEEPALIVE =====
This command is used to read/ajust the background keep-alive delay in seconds. If the timer expires then a background process will make a request to ECU without notice to user: periodic requests avoid that ECU exit from communication session.
Timer is reloaded each time ECU replies to an user request.

==== Synopsis ====
  KWP KEEPALIVE [0..255]

== Example ==
Read current delay
  KWP KEEPALIVE
  4 SECS
  OK

Set 10s delay
  KWP KEEPALIVE 10
  OK

Disable keep-alive process (not recommended)
  KWP KEEPALIVE 0
  OK