Enable/disable keep-alive functionality, and optionally set the initial delay before the first keepalive probe is sent on an idle socket. Set initialDelay
(in milliseconds) to set the delay between the last data packet received and the first keepalive probe. Only available for already connected sockets, will return false otherwise.
Enabling the keep-alive functionality will set the following socket options: SO_KEEPALIVE=1 TCP_KEEPIDLE=initialDelay TCP_KEEPCNT=10 TCP_KEEPINTVL=1