The property KeepAlive refers to a watchdog which calls Read on ServerStatus.
If the property KeepAlive is > 0 then a timer will be created which every "KeepAlive"
milliseconds. This timer reads the server status (NodeId: ns=0;i=2256) of the connected OPC UA server and fires the event OnServerStatusRead.
By default the value of KeepAlive is 0, which means nothing will happen (no watchdog is created)
