Add a routine to check time of last activity of a client.
It that time exceed our defined TIMEOUT, send a PING to the client.
If the client does not respond with the correct token in response, does not update it's time of last activity and if the TIMEOUT_SINCE_PING is exceeded, disconnect the client.
Also added PING and PONG command + modified the doc.
Add a routine to check time of last activity of a client. It that time exceed our defined TIMEOUT, send a PING to the client. If the client does not respond with the correct token in response, does not update it's time of last activity and if the TIMEOUT_SINCE_PING is exceeded, disconnect the client. Also added PING and PONG command + modified the doc.