Upnp

public bool DiscoverIpv6 { get; set; }

If true, IPv6 is used for UpnpDevice discovery.

public int DiscoverLocalPort { get; set; }

If 0, the local port to use for discovery is chosen automatically by the system. If 1, discovery will be done from the source port 1900 (same as destination port). Otherwise, the value will be used as the port.

public string DiscoverMulticastIf { get; set; }

Multicast interface to use for discovery. Uses the default multicast interface if empty.

public void AddDevice(UpnpDevice device);

Adds the given UpnpDevice to the list of discovered devices.

public int AddPortMapping(int port, int portInternal = 0, string desc = "", string proto = "UDP", int duration = 0);

Adds a mapping to forward the external port (between 1 and 65535, although recommended to use port 1024 or above) on the default gateway (see Upnp.GetGateway) to the port_internal on the local machine for the given protocol proto (either "TCP" or "UDP", with UDP being the default). If a port mapping for the given port and protocol combination already exists on that gateway device, this method tries to overwrite it. If that is not desired, you can retrieve the gateway manually with Upnp.GetGateway and call Upnp.AddPortMapping on it, if any. Note that forwarding a well-known port (below 1024) with UPnP may fail depending on the device. Depending on the gateway device, if a mapping for that port already exists, it will either be updated or it will refuse this command due to that conflict, especially if the existing mapping for that port wasn't created via UPnP or points to a different network address (or device) than this one. If port_internal is 0 (the default), the same port number is used for both the external and the internal port (the port value). The description (desc) is shown in some routers management UIs and can be used to point out which application added the mapping. The mapping's lease duration can be limited by specifying a duration in seconds. The default of 0 means no duration, i.e. a permanent lease and notably some devices only support these permanent leases. Note that whether permanent or not, this is only a request and the gateway may still decide at any point to remove the mapping (which usually happens on a reboot of the gateway, when its external IP address changes, or on some models when it detects a port mapping has become inactive, i.e. had no traffic for multiple minutes). If not 0 (permanent), the allowed range according to spec is between 120 (2 minutes) and 86400 seconds (24 hours). See Upnp.UpnpResult for possible return values.

public void ClearDevices();

Clears the list of discovered devices.

public int DeletePortMapping(int port, string proto = "UDP");

Deletes the port mapping for the given port and protocol combination on the default gateway (see Upnp.GetGateway) if one exists. port must be a valid port between 1 and 65535, proto can be either "TCP" or "UDP". May be refused for mappings pointing to addresses other than this one, for well-known ports (below 1024), or for mappings not added via UPnP. See Upnp.UpnpResult for possible return values.

public int Discover(int timeout = 2000, int ttl = 2, string deviceFilter = "InternetGatewayDevice");

Discovers local UpnpDevices. Clears the list of previously discovered devices. Filters for IGD (InternetGatewayDevice) type devices by default, as those manage port forwarding. timeout is the time to wait for responses in milliseconds. ttl is the time-to-live; only touch this if you know what you're doing. See Upnp.UpnpResult for possible return values.

public UpnpDevice GetDevice(int index);

Returns the UpnpDevice at the given index.

public int GetDeviceCount();

Returns the number of discovered UpnpDevices.

public UpnpDevice GetGateway();

Returns the default gateway. That is the first discovered UpnpDevice that is also a valid IGD (InternetGatewayDevice).

public string QueryExternalAddress();

Returns the external IP address of the default gateway (see Upnp.GetGateway) as string. Returns an empty string on error.

public void RemoveDevice(int index);

Removes the device at index from the list of discovered devices.

public void SetDevice(int index, UpnpDevice device);

Sets the device at index from the list of discovered devices to device.