WebBrick Data Output (DI) Event.
This event indicates the current state of a digital input.
Type=http://id.webbrick.co.uk/events/webbrick/DI
Source=webbrick/
fromNode/DI/
srcChannel
ipAdr=dotted ip address
fromNode=webbrick node number
srcChannel=input channel number.
state=0 or 1 for off or on.
