Other Service Discovery Protocols

0 The Bluetooth SDP may be integrated with a number of the other service discovery protocols, including Salutation, UPnP, Service Location Protocol (SLP), and Jini.

0 The Salutation architecture defines a uniform way of labeling devices (fax machines, printers, copiers, and also phones, PDAs, and general electronic equipment) with descriptions of their capabilities and with a single, common method of sharing that information.

0 Salutation is "transport independent," that is, a separate Transport

Manager may be written for each underlying transport required, and the Salutation Manager, which provides the core functionality of the system, remains transport neutral.

0 SLP is a language-independent protocol for automatic resource discovery on IP-based networks. Like some of the other service discovery protocols, it makes use of UDP/IP multicast functionality in TCP/IP. This makes it particularly useful for networks where there is some form of centralized administrative control, such as corporate and campus networks.

Jini is a distributed service-oriented architecture, considered an extension of the Java language and platform. Services communicate with each other using a service protocol, which is defined as a set of interfaces in Java.The standard itself provides a base set of interfaces to facilitate core interaction between services. A key component ofJini is the lookup service.

Communication between services in Jini occurs using Java Remote Method Invocation (RMI). RMI is a Java-based extension to traditional remote procedure call (RPC) mechanisms. One important extension is that it enables actual code, not just data, to be exchanged between services.

0 Universal Plug and Play (UPnP) defines a set of lightweight, open, IP-based discovery protocols that allow appliances to exchange and replicate relevant data between themselves and the PCs on the network. UPnP is a "wire-only" protocol—it defines the format and meaning of what is transmitted between members of the network and says nothing about how the standard is actually implemented. It requires TCP/IP and HTTP to be present to operate.

0 UPnP uses the Simple Service Discovery Protocol (SSDP) to discover services on IP-based networks. SSDP can be operated with or without a lookup or directory service in the network. SSDP operates on the top of the existing open standard protocols, using the HTTP over both Unicast UDP and Multicast UDP.

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