jellyfin/RSSDP/SsdpConstants.cs

namespace Rssdp.Infrastructure
{
    /// <summary>
    /// Provides constants for common values related to the SSDP protocols.
    /// </summary>
    public static class SsdpConstants
    {

        /// <summary>
        /// Multicast IP Address used for SSDP multicast messages. Values is 239.255.255.250.
        /// </summary>
        public const string MulticastLocalAdminAddress = "239.255.255.250";
        /// <summary>
        /// The UDP port used for SSDP multicast messages. Values is 1900.
        /// </summary>
        public const int MulticastPort = 1900;
        /// <summary>
        /// The default multicase TTL for SSDP multicast messages. Value is 4.
        /// </summary>
        public const int SsdpDefaultMulticastTimeToLive = 4;

        internal const string MSearchMethod = "M-SEARCH";

        internal const string SsdpDiscoverMessage = "ssdp:discover";
        internal const string SsdpDiscoverAllSTHeader = "ssdp:all";

        internal const string SsdpDeviceDescriptionXmlNamespace = "urn:schemas-upnp-org:device-1-0";

        /// <summary>
        /// Default buffer size for receiving SSDP broadcasts. Value is 8192 (bytes).
        /// </summary>
        public const int DefaultUdpSocketBufferSize = 8192;
        /// <summary>
        /// The maximum possible buffer size for a UDP message. Value is 65507 (bytes).
        /// </summary>
        public const int MaxUdpSocketBufferSize = 65507; // Max possible UDP packet size on IPv4 without using 'jumbograms'.

        /// <summary>
        /// Namespace/prefix for UPnP device types. Values is schemas-upnp-org.
        /// </summary>
        public const string UpnpDeviceTypeNamespace = "schemas-upnp-org";
        /// <summary>
        /// UPnP Root Device type. Value is upnp:rootdevice.
        /// </summary>
        public const string UpnpDeviceTypeRootDevice = "upnp:rootdevice";
        /// <summary>
        /// The value is used by Windows Explorer for device searches instead of the UPNPDeviceTypeRootDevice constant.
        /// Not sure why (different spec, bug, alternate protocol etc). Used to enable Windows Explorer support.
        /// </summary>
        public const string PnpDeviceTypeRootDevice = "pnp:rootdevice";
        /// <summary>
        /// UPnP Basic Device type. Value is Basic.
        /// </summary>
        public const string UpnpDeviceTypeBasicDevice = "Basic";

        internal const string SsdpKeepAliveNotification = "ssdp:alive";
        internal const string SsdpByeByeNotification = "ssdp:byebye";

        internal const int UdpResendCount = 3;
    }
}