Network Connected Devices

Network Connected Devices

Joseph Ngari| Program Manager

Easily connect and control your network devices

What are UPnP and PnP-X

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About UPnP• It enables a standards based discovery and communication solution

for network connected devices.

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UPnP in a nutshell• Device must implement http• Discovery (SSDP)

• Windows initiates multicast on port 1900 which contains special tag: M-SEARCH. • Device responds via unicast with URL to a device description document (DDD)• Host downloads the DDD from the URL• The DDD has pointers to the Service Control Protocol Description (SCPD) ,

eventing and presentation URLs. These additional services are not needed for discovery.

• Learn More: http://www.upnp.org/

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PnP-X• Very easy. Its one xml tag in the DDD

• <pnpx:X_hardwareId>Microsoft/SampleDevice/10000/urn:microsoft-com:device:SampleDimmerDevice:1</pnpx:X_hardwareId>

• Enables an enhanced pairing experience with windows. • Only have to provide a PnP-X hardware ID and the device type.

• This lives in the DDD we covered above.• If you don’t use a PnP-X ID you will not be able to get connected.

Binding with the App

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Device meta-data uses PnP-X IDThis goes in your DDD<pnpx:X_hardwareId>Microsoft/SampleDevice/10000/urn:microsoft-com:device:SampleDimmerDevice:1</pnpx:X_hardwareId>

You then add the ID to the meta-data as shown below. The prefix will be added by the device meta-data wizard.

Device Presence

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Device Presence• Device has a dev node once it is paired and regardless of whether

the device is connected. • Windows keeps track of presence.

• Device should send periodic “alive” messages. • Device should send “byebye” before it disconnects otherwise the PC will think

the device is still connected for up to 30 minutes.

Communicating with the device

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Retrieving the device• Device enumeration

• Once you get the IP address you can use any desired communication protocol. • We recommend UPnP.

• No need to invent a new protocol.• Enables anyone to talk to your device. • Will not conflict with other operating systems

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Using the device• Get the Service Control Protocol Description (SCPD)• Invoke actions• Subscribe for events

• SOAP• UPnP uses soap to communicate• Additional Resources

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Automatic Connection• Network Connected Device Automatic Setup (NCD-AS)

• Requirements• Must be on a private network and sharing must be enabled.• Must have less than 30 number of devices on the network.

• This includes all devices and not just UPnP devices. • Must fit into specific device categories

• General rule is that it is a shared device in the home• Device category must be correct.

This optional PnP-X tag describes the device category.

<pnpx:X_deviceCategory>HomeAutomation</pnpx:X_deviceCategory>

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Resources• Windows Rally• UPnP• Dimmer Sample