UPNP

    UPNP network functions.

    Provides UPNP functionality to discover s on the local network and execute commands on them, like managing port mappings (port forwarding) and querying the local and remote network IP address. Note that methods on this class are synchronous and block the calling thread.

    To forward a specific port:

    To close a specific port (e.g. after you have finished using it):

    Note: UPnP discovery blocks the current thread. To perform discovery without blocking the main thread, use Threads like this:

    Properties

    Enumerations

    enum UPNPResult:

    • UPNP_RESULT_SUCCESS = 0 —- UPNP command or discovery was successful.

    • UPNP_RESULT_NOT_AUTHORIZED = 1 —- Not authorized to use the command on the UPNPDevice. May be returned when the user disabled UPNP on their router.

    • UPNP_RESULT_PORT_MAPPING_NOT_FOUND = 2 —- No port mapping was found for the given port, protocol combination on the given .

    • UPNP_RESULT_INCONSISTENT_PARAMETERS = 3 —- Inconsistent parameters.

    • UPNP_RESULT_NO_SUCH_ENTRY_IN_ARRAY = 4 —- No such entry in array. May be returned if a given port, protocol combination is not found on an UPNPDevice.

    • UPNP_RESULT_ACTION_FAILED = 5 —- The action failed.

    • UPNP_RESULT_SRC_IP_WILDCARD_NOT_PERMITTED = 6 —- The does not allow wildcard values for the source IP address.

    • UPNP_RESULT_EXT_PORT_WILDCARD_NOT_PERMITTED = 7 —- The UPNPDevice does not allow wildcard values for the external port.

    • UPNP_RESULT_INT_PORT_WILDCARD_NOT_PERMITTED = 8 —- The does not allow wildcard values for the internal port.

    • UPNP_RESULT_EXT_PORT_MUST_BE_WILDCARD = 10 —- The external port value must be a wildcard.

    • UPNP_RESULT_NO_PORT_MAPS_AVAILABLE = 11 —- No port maps are available. May also be returned if port mapping functionality is not available.

    • UPNP_RESULT_CONFLICT_WITH_OTHER_MECHANISM = 12 —- Conflict with other mechanism. May be returned instead of UPNP_RESULT_CONFLICT_WITH_OTHER_MAPPING if a port mapping conflicts with an existing one.

    • UPNP_RESULT_CONFLICT_WITH_OTHER_MAPPING = 13 —- Conflict with an existing port mapping.

    • UPNP_RESULT_SAME_PORT_VALUES_REQUIRED = 14 —- External and internal port values must be the same.

    • UPNP_RESULT_ONLY_PERMANENT_LEASE_SUPPORTED = 15 —- Only permanent leases are supported. Do not use the duration parameter when adding port mappings.

    • UPNP_RESULT_INVALID_GATEWAY = 16 —- Invalid gateway.

    • UPNP_RESULT_INVALID_PORT = 17 —- Invalid port.

    • UPNP_RESULT_INVALID_PROTOCOL = 18 —- Invalid protocol.

    • UPNP_RESULT_INVALID_DURATION = 19 —- Invalid duration.

    • UPNP_RESULT_INVALID_ARGS = 20 —- Invalid arguments.

    • UPNP_RESULT_INVALID_RESPONSE = 21 —- Invalid response.

    • UPNP_RESULT_INVALID_PARAM = 22 —- Invalid parameter.

    • UPNP_RESULT_HTTP_ERROR = 23 —- HTTP error.

    • UPNP_RESULT_SOCKET_ERROR = 24 —- Socket error.

    • UPNP_RESULT_NO_GATEWAY = 26 —- No gateway available. You may need to call first, or discovery didn’t detect any valid IGDs (InternetGatewayDevices).

    • UPNP_RESULT_NO_DEVICES = 27 —- No devices available. You may need to call discover first, or discovery didn’t detect any valid s.

    • UPNP_RESULT_UNKNOWN_ERROR = 28 —- Unknown error.

    • discover_ipv6

    If true, IPv6 is used for UPNPDevice discovery.

    • discover_local_port

    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.

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

    Method Descriptions

    Adds the given to the list of discovered devices.

    • int add_port_mapping ( port, int port_internal=0, desc=””, String proto=”UDP”, duration=0 ) const

    Adds a mapping to forward the external (between 1 and 65535) on the default gateway (see get_gateway) to the internal_port 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 and call add_port_mapping on it, if any.

    If internal_port 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 router 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). However, some routers are incompatible with one or both of these, so use with caution and add fallback logic in case of errors to retry without them if in doubt.

    See for possible return values.

    • void clear_devices ( )

    Clears the list of discovered devices.

    • int delete_port_mapping ( port, String proto=”UDP” ) const

    Deletes the port mapping for the given port and protocol combination on the default gateway (see ) if one exists. must be a valid port between 1 and 65535, proto can be either TCP or UDP. See UPNPResult for possible return values.

    • discover ( int timeout=2000, ttl=2, String device_filter=”InternetGatewayDevice” )

    Discovers local s. 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 UPNPResult for possible return values.

    • get_device ( int index ) const

    Returns the at the given index.

    • int get_device_count ( ) const

    Returns the number of discovered s.

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

    • String query_external_address ( ) const

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

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