The watchdog task which now sends whitespace pings to the client needs to be extended with following features:

1. A configuration option to send XMPP pings instead of whitespace pings

2. If there is no activity on the connection for configured period of time (no XMPP ping response) then close the connection (and start the stream resumption timeout)

3. A configuration option to set intervals for sending either the whitespace ping or XMPP ping