Simple Service Discovery Protocol (SSDP)


- It is the basis of the discovery protocol of Universal Plug and Play (UPnP)

   incorporated into the UPnP protocol stack

- It accomplishes this without assistance of server-based configuration mechanisms

   IP multicast:

- a text-based protocol based on HTTPU

   search requests and advertisements: HTTP on top of UDP using multicast (known as HTTPMU)

   Responses to search requests: unicast (known as HTTPU)

- It uses UDP as the underlying transport protocol

HTTP method

    announce the establishment or withdrawal of services (presence) information to the multicast group