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+====== SSDP announcer for UPnP/DLNA ======
+- a program for announcing the network UPnP/DLNA devices.\\
+Announcements are sent using IPv4 and IPv6 on the special multicast address.\\
+SSDP announcer allows you announce on your LAN any UPnP / DLNA server located on the Internet, another network segment.\\
+UPnP - based on the SSDP announcements for automatic detection of available devices on the local network, and HTTP to communicate with devices it has found.\\
+In HTTP, the data is transmitted using XML-SOAP.\\
+Archive with SSDP announcer contains implementation UPnP / DLNA server on nginx and PHP.\\
+Nginx takes on work with http, php script processes the XML-SOAP requests from client devices.\\
+The script allows browsing through the file system and access to the media which is to be found.\\
+Thanks SSDP announcer can write your own UPnP / DLNA server on any scripting language, which is able to work nginx.\\
+===== Supported OS =====
+  * FreeBSD
+  * Linux
+===== How it works =====
+UPnP clients (eg DLNA for android, VLC under Linux etc), listen to the network multicast announcements and periodically send queries themselves to receive announcements.\\
+Announcements represent a IPv4 / IPv6 multicast UDP packets with HTTP format for content. Requests are sent directly to the announcer.\\
+Announcement contains:
+  * UUID - unique device ID;
+  * type devices advertised;
+  * services offered device;
+  * URL for by HTTP-GET XML file detailing the devices and links to XML files, a description of its services.\\
+SSDPd requires specify on which interfaces to work out what URL announce and XML file describing the device.\\
+In this work SSDPd ends. Everything else happens communication client to the server via HTTP.\\
+Client after receiving announcements if he was interested in the type of UPnP devices on the HTTP-GET takes the XML file from the announcement of the URL, parses it, then picks up the XML files describing services.\\
+XML files are static, attached examples in the distribution.\\
+After parsing the XML files the client accesses the services by URL specified in XML files using HTTP, using the methods: POST, SUBSCRIBE, UNSUBSCRIBE.\\
+In a simple case (for a minimum of the functional) processing HTTP request methods SUBSCRIBE, UNSUBSCRIBE amount to granting the 200 + a pair of additional headers this can easily cope nginx.\\
+==== Multicast addresses ====
+  * 239.255.255.250:1900
+  * [FF02::C]:1900 - link local scope
+  * [FF05::C]:1900 - site local scope
+===== Settings =====
+[[software:ssdpd:config|Settings description]]
+===== Download =====
+Source code: [[https://github.com/rozhuk-im/ssdpd]]\\
+UPnP docs: [[http://www.netlab.linkpc.net/download/software/ssdpd/doc/]]
+{{tag>software freebsd linux net UPnP DLNA SSDP nginx mysoft}}

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