UPnP Control
After the control point has learned of a device and its services, it can invoke action on these services and obtain return values. The control point can also poll the services advertised by a device for state variables. To invoke a specific action, the control point sends a POST control message to the device's service. A control message contains a set of vendor-specific information as well as action names, argument names, and variables that are defined by the UPnP Forum working committee. The control point uses SOAP to format this information and then transmits it to the device by means of TCP/IP.
The service responds by transmitting an HTTP message that notifies the control point of the status of the request within 30 seconds of receiving the request. After completing the request, the service returns any results or errors. The control point can also query a device's service for state variables.
See Also
Last updated on Tuesday, May 18, 2004
© 1992-2003 Microsoft Corporation. All rights reserved.