Device properties are reported as undefined

[FantasticFiasco]

Device properties in the cache should be prioritized over undefined properties from discovered devices. Running the sample illustrates the problem.

9:16:30 AM - Hello from <mac address> on <ip address>
	port: undefined
	model: undefined
9:16:30 AM - Hello from <mac address> on <ip address>
	port: 80
	model: <model>
9:16:30 AM - Hello from <mac address> on <ip address>
	port: 80
	model: undefined

The model should not be reported as undefined in the final hello.