[dev] How to: device vs. resource discovery in IoTivity

[Wong Hon Chan, Neil D]

> My "dream logic":
>
> First, the app finds the devices and identify them using the unique ID 
> (assuming the app logic needs to "remember" something about the devices, and 
> not just find them).
> Then, find the respective resources of the devices, so the app can control 
> the device.
>
> Unfortunately, failed to understand from the samples how it can be done.
>
> Looking in the Android code:
> Resource discovery is done via OcPlatform.findResource(),
> Device discovery is done via OcPlatform.getDeviceInfo().

Hello,

below is a description of the flow that would be required when trying to find 
the resources for a specific server:
1.OcPlatform.getDeviceInfo()
2.onDeviceFound(OcRepresentation ocRepresentation)
3.OcPlatform.findResource(<HostURI>, ...)

e.g.:
OcPlatform.getDeviceInfo("",
                    OcPlatform.WELL_KNOWN_DEVICE_QUERY,
                    EnumSet.of(OcConnectivityType.CT_IP_USE_V4),
                    <OcPlatform.OnDeviceFoundListener>);

The <listener> would then have an implementation of 
onDeviceFound(OcRepresentation ocRepresentation);