Any Documentation on "physicalgraph device HubAction"?

@geko, do you have a working example of this? I"m trying to do a GET command but get the following error in my device type.

    groovy.lang.MissingMethodException: No signature of method: script1409823233728390831521.sendHubCommand() is applicable for argument types: (physicalgraph.device.HubAction) values: [GET / HTTP/1.1 
Accept: */* 
User-Agent: Linux UPnP/1.0 SmartThings 
HOST: 192.168.111 

] 

My code:

   ...
    private getReading() {
         def httpRequest = [
          	method:		"GET",
            path: 		"/",
            headers:	[HOST:		"192.168.111:80",
    						Accept: 	"*/*"
                        ]
    	]
    
    	def hubAction = new physicalgraph.device.HubAction(httpRequest)
    	sendHubCommand(hubAction)
    }