Network.Tox.C.Tox

Public core API for Tox clients.

Every function that can fail takes a function-specific error code pointer that can be used to diagnose problems with the Tox state or the function arguments. The error code pointer can be nullPtr, which does not influence the function's behaviour, but can be done if the reason for failure is irrelevant to the client.

The exception to this rule are simple allocation functions whose only failure mode is allocation failure. They return nullPtr in that case, and do not set an error code.

Every error code type has an OK value to which functions will set their error code value on success. Clients can keep their error code uninitialised before passing it to a function. The library guarantees that after returning, the value pointed to by the error code pointer has been initialised.

Functions with pointer parameters often have a nullPtr error code, meaning they could not perform any operation, because one of the required parameters was nullPtr. Some functions operate correctly or are defined as effectless on nullPtr.

Some functions additionally return a value outside their return type domain, or a bool containing true on success and false on failure.

All functions that take a Tox instance pointer will cause undefined behaviour when passed a nullPtr Tox pointer.

All integer values are expected in host byte order.

Functions with parameters with enum types cause unspecified behaviour if the enumeration value is outside the valid range of the type. If possible, the function will try to use a sane default, but there will be no error code, and one possible action for the function to take is to have no effect.

subsection events Events and callbacks

Events are handled by callbacks. One callback can be registered per event. All events have a callback function type named `tox_{event}_cb` and a function to register it named `tox_callback_{event}`. Passing a nullPtr callback will result in no callback being registered for that event. Only one callback per event can be registered, so if a client needs multiple event listeners, it needs to implement the dispatch functionality itself.

subsection threading Threading implications

It is possible to run multiple concurrent threads with a Tox instance for each thread. It is also possible to run all Tox instances in the same thread. A common way to run Tox (multiple or single instance) is to have one thread running a simple tox_iterate loop, sleeping for tox_iteration_interval milliseconds on each iteration.

If you want to access a single Tox instance from multiple threads, access to the instance must be synchronised. While multiple threads can concurrently access multiple different Tox instances, no more than one API function can operate on a single instance at any given time.

Functions that write to variable length byte arrays will always have a size function associated with them. The result of this size function is only valid until another mutating function (one that takes a pointer to non-const Tox) is called. Thus, clients must ensure that no other thread calls a mutating function between the call to the size function and the call to the retrieval function.

E.g. to get the current nickname, one would write

code CSize length = tox_self_get_name_size(tox); CString name = malloc(length); if (!name) abort(); tox_self_get_name(tox, name); endcode

If any other thread calls tox_self_set_name while this thread is allocating memory, the length may have become invalid, and the call to tox_self_get_name may cause undefined behaviour.

Documentation

withTox :: Options -> (ToxPtr -> IO a) -> IO (Either ErrNew a)

toxGetSavedata :: ToxPtr -> IO ByteString

toxBootstrap :: ToxPtr -> String -> Word16 -> ByteString -> IO (Either ErrBootstrap Bool)

Sends a "get nodes" request to the given bootstrap node with IP, port, and public key to setup connections.

This function will attempt to connect to the node using UDP. You must use this function even if Options.udp_enabled was set to false.

param address The hostname or IP address (IPv4 or IPv6) of the node. param port The port on the host on which the bootstrap Tox instance is listening. param public_key The long term public key of the bootstrap node (tox_public_key_size bytes). return true on success.

toxAddTcpRelay :: ToxPtr -> String -> Word16 -> ByteString -> IO (Either ErrBootstrap Bool)

Adds additional host:port pair as TCP relay.

This function can be used to initiate TCP connections to different ports on the same bootstrap node, or to add TCP relays without using them as bootstrap nodes.

param address The hostname or IP address (IPv4 or IPv6) of the TCP relay. param port The port on the host on which the TCP relay is listening. param public_key The long term public key of the TCP relay (tox_public_key_size bytes). return true on success.

data ToxEventsStruct

type ToxEvents = Ptr ToxEventsStruct

data ErrEventsIterate

Common error codes for all functions that set a piece of user-visible client information.

Constructors

ErrEventsIterateMalloc

ErrEventsDecode

Instances

Bounded ErrEventsIterate

Defined in Network.Tox.C.Tox

Methods

minBound :: ErrEventsIterate

maxBound :: ErrEventsIterate

Enum ErrEventsIterate

Defined in Network.Tox.C.Tox

Methods

succ :: ErrEventsIterate -> ErrEventsIterate

pred :: ErrEventsIterate -> ErrEventsIterate

toEnum :: Int -> ErrEventsIterate

fromEnum :: ErrEventsIterate -> Int

enumFrom :: ErrEventsIterate -> [ErrEventsIterate]

enumFromThen :: ErrEventsIterate -> ErrEventsIterate -> [ErrEventsIterate]

enumFromTo :: ErrEventsIterate -> ErrEventsIterate -> [ErrEventsIterate]

enumFromThenTo :: ErrEventsIterate -> ErrEventsIterate -> ErrEventsIterate -> [ErrEventsIterate]

Eq ErrEventsIterate

Defined in Network.Tox.C.Tox

Methods

(==) :: ErrEventsIterate -> ErrEventsIterate -> Bool

(/=) :: ErrEventsIterate -> ErrEventsIterate -> Bool

Ord ErrEventsIterate

Defined in Network.Tox.C.Tox

Methods

compare :: ErrEventsIterate -> ErrEventsIterate -> Ordering

(<) :: ErrEventsIterate -> ErrEventsIterate -> Bool

(<=) :: ErrEventsIterate -> ErrEventsIterate -> Bool

(>) :: ErrEventsIterate -> ErrEventsIterate -> Bool

(>=) :: ErrEventsIterate -> ErrEventsIterate -> Bool

max :: ErrEventsIterate -> ErrEventsIterate -> ErrEventsIterate

min :: ErrEventsIterate -> ErrEventsIterate -> ErrEventsIterate

Read ErrEventsIterate

Defined in Network.Tox.C.Tox

Methods

readsPrec :: Int -> ReadS ErrEventsIterate

readList :: ReadS [ErrEventsIterate]

readPrec :: ReadPrec ErrEventsIterate

readListPrec :: ReadPrec [ErrEventsIterate]

Show ErrEventsIterate

Defined in Network.Tox.C.Tox

Methods

showsPrec :: Int -> ErrEventsIterate -> ShowS

show :: ErrEventsIterate -> String

showList :: [ErrEventsIterate] -> ShowS

tox_events_init :: ToxPtr -> IO ()

tox_events_iterate :: ToxPtr -> Bool -> CErr ErrEventsIterate -> IO ToxEvents

tox_events_bytes_size :: ToxEvents -> IO Word32

tox_events_get_bytes :: ToxEvents -> CString -> IO ()

tox_events_load :: CString -> Word32 -> IO ToxEvents

tox_events_free :: ToxEvents -> IO ()

toxEventsToPtr :: [Event] -> IO ToxEvents

toxEventsFromPtr :: ToxEvents -> IO (Either String [Event])

toxEventsIterate :: ToxPtr -> IO (Either String [Event])

toxIterationInterval :: ToxPtr -> IO Word32

Return the time in milliseconds before tox_iterate() should be called again for optimal performance.

toxSelfGetAddress :: ToxPtr -> IO ByteString

Writes the Tox friend address of the client to a byte array. The address is not in human-readable format. If a client wants to display the address, formatting is required.

param address A memory region of at least tox_address_size bytes. If this parameter is nullPtr, this function has no effect. see tox_address_size for the address format.

toxSelfSetNospam :: ToxPtr -> Word32 -> IO ()

Set the 4-byte nospam part of the address.

@param nospam Any 32 bit unsigned integer.

toxSelfGetNospam :: ToxPtr -> IO Word32

Get the 4-byte nospam part of the address.

toxSelfGetPublicKey :: ToxPtr -> IO ByteString

Copy the Tox Public Key (long term) from the Tox object.

@param public_key A memory region of at least tox_public_key_size bytes. If this parameter is nullPtr, this function has no effect.

toxSelfGetSecretKey :: ToxPtr -> IO ByteString

Copy the Tox Secret Key from the Tox object.

@param secret_key A memory region of at least tox_secret_key_size bytes. If this parameter is nullPtr, this function has no effect.

toxSelfSetName :: ToxPtr -> ByteString -> IO (Either ErrSetInfo Bool)

Set the nickname for the Tox client.

Nickname length cannot exceed tox_max_name_length. If length is 0, the name parameter is ignored (it can be nullPtr), and the nickname is set back to empty.

param name A byte array containing the new nickname. param length The size of the name byte array.

@return true on success.

toxSelfGetName :: ToxPtr -> IO ByteString

Write the nickname set by tox_self_set_name to a byte array.

If no nickname was set before calling this function, the name is empty, and this function has no effect.

Call tox_self_get_name_size to find out how much memory to allocate for the result.

@param name A valid memory location large enough to hold the nickname. If this parameter is NULL, the function has no effect.

toxSelfSetStatusMessage :: ToxPtr -> ByteString -> IO (Either ErrSetInfo Bool)

Set the client's status message.

Status message length cannot exceed tox_max_status_message_length. If length is 0, the status parameter is ignored (it can be nullPtr), and the user status is set back to empty.

toxSelfGetStatusMessage :: ToxPtr -> IO ByteString

Write the status message set by tox_self_set_status_message to a byte array.

If no status message was set before calling this function, the status is empty, and this function has no effect.

Call tox_self_get_status_message_size to find out how much memory to allocate for the result.

@param status_message A valid memory location large enough to hold the status message. If this parameter is NULL, the function has no effect.

toxSelfSetStatus :: ToxPtr -> UserStatus -> IO ()

Set the client's user status.

@param user_status One of the user statuses listed in the enumeration above.

toxFriendAdd :: ToxPtr -> ByteString -> ByteString -> IO (Either ErrFriendAdd Word32)

Add a friend to the friend list and send a friend request.

A friend request message must be at least 1 byte long and at most tox_max_friend_request_length.

Friend numbers are unique identifiers used in all functions that operate on friends. Once added, a friend number is stable for the lifetime of the Tox object. After saving the state and reloading it, the friend numbers may not be the same as before. Deleting a friend creates a gap in the friend number set, which is filled by the next adding of a friend. Any pattern in friend numbers should not be relied on.

If more than INT32_MAX friends are added, this function causes undefined behaviour.

param address The address of the friend (returned by tox_self_get_address of the friend you wish to add) it must be tox_address_size bytes. param message The message that will be sent along with the friend request. @param length The length of the data byte array.

@return the friend number on success, UINT32_MAX on failure.

toxFriendAddNorequest :: ToxPtr -> ByteString -> IO (Either ErrFriendAdd Word32)

Add a friend without sending a friend request.

This function is used to add a friend in response to a friend request. If the client receives a friend request, it can be reasonably sure that the other client added this client as a friend, eliminating the need for a friend request.

This function is also useful in a situation where both instances are controlled by the same entity, so that this entity can perform the mutual friend adding. In this case, there is no need for a friend request, either.

@param public_key A byte array of length tox_public_key_size containing the Public Key (not the Address) of the friend to add.

return the friend number on success, UINT32_MAX on failure. see tox_friend_add for a more detailed description of friend numbers.

toxFriendDelete :: ToxPtr -> Word32 -> IO (Either ErrFriendDelete Bool)

Remove a friend from the friend list.

This does not notify the friend of their deletion. After calling this function, this client will appear offline to the friend and no communication can occur between the two.

@param friend_number Friend number for the friend to be deleted.

@return true on success.

toxFriendByPublicKey :: ToxPtr -> ByteString -> IO (Either ErrFriendByPublicKey Word32)

Return the friend number associated with that Public Key.

return the friend number on success, UINT32_MAX on failure. param public_key A byte array containing the Public Key.

toxFriendExists :: ToxPtr -> Word32 -> IO Bool

Checks if a friend with the given friend number exists and returns true if it does.

toxSelfGetFriendList :: ToxPtr -> IO [Word32]

Copy a list of valid friend numbers into an array.

Call tox_self_get_friend_list_size to determine the number of elements to allocate.

@param list A memory region with enough space to hold the friend list. If this parameter is nullPtr, this function has no effect.

toxFriendGetPublicKey :: ToxPtr -> Word32 -> IO (Either ErrFriendGetPublicKey ByteString)

Copies the Public Key associated with a given friend number to a byte array.

param friend_number The friend number you want the Public Key of. param public_key A memory region of at least tox_public_key_size bytes. If this parameter is nullPtr, this function has no effect.

@return true on success.

toxFriendGetLastOnline :: ToxPtr -> Word32 -> IO (Either ErrFriendGetLastOnline EpochTime)

Return a unix-time timestamp of the last time the friend associated with a given friend number was seen online. This function will return UINT64_MAX on error.

@param friend_number The friend number you want to query.

toxFriendGetName :: ToxPtr -> Word32 -> IO (Either ErrFriendQuery ByteString)

Write the name of the friend designated by the given friend number to a byte array.

Call tox_friend_get_name_size to determine the allocation size for the name parameter.

The data written to name is equal to the data received by the last friend_name callback.

@param name A valid memory region large enough to store the friend's name.

@return true on success.

toxFriendGetStatusMessage :: ToxPtr -> Word32 -> IO (Either ErrFriendQuery ByteString)

Write the status message of the friend designated by the given friend number to a byte array.

Call tox_friend_get_status_message_size to determine the allocation size for the status_name parameter.

The data written to status_message is equal to the data received by the last friend_status_message callback.

@param status_message A valid memory region large enough to store the friend's status message.

toxFriendGetConnectionStatus :: ToxPtr -> Word32 -> IO (Either ErrFriendQuery Connection)

Check whether a friend is currently connected to this client.

The result of this function is equal to the last value received by the friend_connection_status callback.

@param friend_number The friend number for which to query the connection status.

@return the friend's connection status as it was received through the friend_connection_status event.

toxFriendGetTyping :: ToxPtr -> Word32 -> IO (Either ErrFriendQuery Bool)

Check whether a friend is currently typing a message.

@param friend_number The friend number for which to query the typing status.

return true if the friend is typing. return false if the friend is not typing, or the friend number was invalid. Inspect the error code to determine which case it is.

toxSelfSetTyping :: ToxPtr -> Word32 -> Bool -> IO (Either ErrSetTyping Bool)

Set the client's typing status for a friend.

The client is responsible for turning it on or off.

param friend_number The friend to which the client is typing a message. param typing The typing status. True means the client is typing.

@return true on success.

toxFriendSendMessage :: ToxPtr -> Word32 -> MessageType -> ByteString -> IO (Either ErrFriendSendMessage Word32)

Send a text chat message to an online friend.

This function creates a chat message packet and pushes it into the send queue.

The message length may not exceed tox_max_message_length. Larger messages must be split by the client and sent as separate messages. Other clients can then reassemble the fragments. Messages may not be empty.

The return value of this function is the message ID. If a read receipt is received, the triggered friend_read_receipt event will be passed this message ID.

Message IDs are unique per friend. The first message ID is 0. Message IDs are incremented by 1 each time a message is sent. If UINT32_MAX messages were sent, the next message ID is 0.

param type Message type (normal, action, ...). param friend_number The friend number of the friend to send the message to. param message A non-nullPtr pointer to the first element of a byte array containing the message text. param length Length of the message to be sent.

toxHash :: ByteString -> IO ByteString

Generates a cryptographic hash of the given data.

This function may be used by clients for any purpose, but is provided primarily for validating cached avatars. This use is highly recommended to avoid unnecessary avatar updates.

If hash is nullPtr or data is nullPtr while length is not 0 the function returns false, otherwise it returns true.

This function is a wrapper to internal message-digest functions.

param hash A valid memory location the hash data. It must be at least tox_hash_length bytes in size. param data Data to be hashed or nullPtr. @param length Size of the data array or 0.

@return true if hash was not nullPtr.

toxFileControl :: ToxPtr -> Word32 -> Word32 -> FileControl -> IO (Either ErrFileControl Bool)

Sends a file control command to a friend for a given file transfer.

param friend_number The friend number of the friend the file is being transferred to or received from. param file_number The friend-specific identifier for the file transfer. @param control The control command to send.

@return true on success.

toxFileSeek :: ToxPtr -> Word32 -> Word32 -> Word64 -> IO (Either ErrFileSeek Bool)

Sends a file seek control command to a friend for a given file transfer.

This function can only be called to resume a file transfer right before FileControlResume is sent.

param friend_number The friend number of the friend the file is being received from. param file_number The friend-specific identifier for the file transfer. @param position The position that the file should be seeked to.

toxFileGetFileId :: ToxPtr -> Word32 -> Word32 -> IO (Either ErrFileGet ByteString)

Copy the file id associated to the file transfer to a byte array.

param friend_number The friend number of the friend the file is being transferred to or received from. param file_number The friend-specific identifier for the file transfer. @param file_id A memory region of at least tox_file_id_length bytes. If this parameter is nullPtr, this function has no effect.

@return true on success.

toxFileSend :: ToxPtr -> Word32 -> FileKind -> Word64 -> ByteString -> IO (Either ErrFileSend Word32)

Send a file transmission request.

Maximum filename length is tox_max_filename_length bytes. The filename should generally just be a file name, not a path with directory names.

If a non-UINT64_MAX file size is provided, it can be used by both sides to determine the sending progress. File size can be set to UINT64_MAX for streaming data of unknown size.

File transmission occurs in chunks, which are requested through the file_chunk_request event.

When a friend goes offline, all file transfers associated with the friend are purged from core.

If the file contents change during a transfer, the behaviour is unspecified in general. What will actually happen depends on the mode in which the file was modified and how the client determines the file size.

• If the file size was increased
• and sending mode was streaming (file_size = UINT64_MAX), the behaviour will be as expected.
• and sending mode was file (file_size != UINT64_MAX), the file_chunk_request callback will receive length = 0 when Core thinks the file transfer has finished. If the client remembers the file size as it was when sending the request, it will terminate the transfer normally. If the client re-reads the size, it will think the friend cancelled the transfer.
• If the file size was decreased
• and sending mode was streaming, the behaviour is as expected.
• and sending mode was file, the callback will return 0 at the new (earlier) end-of-file, signalling to the friend that the transfer was cancelled.
• If the file contents were modified
• at a position before the current read, the two files (local and remote) will differ after the transfer terminates.
• at a position after the current read, the file transfer will succeed as expected.
• In either case, both sides will regard the transfer as complete and successful.

param friend_number The friend number of the friend the file send request should be sent to. param kind The meaning of the file to be sent. param file_size Size in bytes of the file the client wants to send, UINT64_MAX if unknown or streaming. param file_id A file identifier of length tox_file_id_length that can be used to uniquely identify file transfers across core restarts. If nullPtr, a random one will be generated by core. It can then be obtained by using tox_file_get_file_id(). param filename Name of the file. Does not need to be the actual name. This name will be sent along with the file send request. param filename_length Size in bytes of the filename.

@return A file number used as an identifier in subsequent callbacks. This number is per friend. File numbers are reused after a transfer terminates. On failure, this function returns UINT32_MAX. Any pattern in file numbers should not be relied on.

toxFileSendChunk :: ToxPtr -> Word32 -> Word32 -> Word64 -> ByteString -> IO (Either ErrFileSendChunk Bool)

Send a chunk of file data to a friend.

This function is called in response to the file_chunk_request callback. The length parameter should be equal to the one received though the callback. If it is zero, the transfer is assumed complete. For files with known size, Core will know that the transfer is complete after the last byte has been received, so it is not necessary (though not harmful) to send a zero-length chunk to terminate. For streams, core will know that the transfer is finished if a chunk with length less than the length requested in the callback is sent.

param friend_number The friend number of the receiving friend for this file. param file_number The file transfer identifier returned by tox_file_send. param position The file or stream position from which to continue reading. return true on success.

toxConferenceNew :: ToxPtr -> IO (Either ErrConferenceNew Word32)

Creates a new conference.

This function creates a new text conference.

@return conference number on success, or UINT32_MAX on failure.

toxConferenceDelete :: ToxPtr -> Word32 -> IO (Either ErrConferenceDelete Bool)

This function deletes a conference.

@param conference_number The conference number of the conference to be deleted.

@return true on success.

toxConferencePeerCount :: ToxPtr -> Word32 -> IO (Either ErrConferencePeerQuery Word32)

Return the number of peers in the conference. Return value is unspecified on failure.

toxConferencePeerGetName :: ToxPtr -> Word32 -> Word32 -> IO (Either ErrConferencePeerQuery ByteString)

Copy the name of peer_number who is in conference_number to name. name must be at least TOX_MAX_NAME_LENGTH long.

@return true on success.

toxConferencePeerGetPublicKey :: ToxPtr -> Word32 -> Word32 -> IO (Either ErrConferencePeerQuery ByteString)

Copy the public key of peer_number who is in conference_number to public_key. public_key must be TOX_PUBLIC_KEY_SIZE long.

@return true on success.

toxConferencePeerNumberIsOurs :: ToxPtr -> Word32 -> Word32 -> IO (Either ErrConferencePeerQuery Bool)

Return true if passed peer_number corresponds to our own.

toxConferenceInvite :: ToxPtr -> Word32 -> Word32 -> IO (Either ErrConferenceInvite Bool)

Invites a friend to a conference.

param friend_number The friend number of the friend we want to invite. param conference_number The conference number of the conference we want to invite the friend to.

@return true on success.

toxConferenceJoin :: ToxPtr -> Word32 -> ByteString -> IO (Either ErrConferenceJoin Word32)

Joins a conference that the client has been invited to.

param friend_number The friend number of the friend who sent the invite. param cookie Received via the conference_invite event. @param length The size of cookie.

@return conference number on success, UINT32_MAX on failure.

toxConferenceSendMessage :: ToxPtr -> Word32 -> MessageType -> ByteString -> IO (Either ErrConferenceSendMessage Bool)

Send a text chat message to the conference.

This function creates a conference message packet and pushes it into the send queue.

The message length may not exceed TOX_MAX_MESSAGE_LENGTH. Larger messages must be split by the client and sent as separate messages. Other clients can then reassemble the fragments.

param conference_number The conference number of the conference the message is intended for. param type Message type (normal, action, ...). param message A non-NULL pointer to the first element of a byte array containing the message text. param length Length of the message to be sent.

@return true on success.

toxConferenceGetTitle :: ToxPtr -> Word32 -> IO (Either ErrConferenceTitle ByteString)

Write the title designated by the given conference number to a byte array.

Call tox_conference_get_title_size to determine the allocation size for the title parameter.

The data written to title is equal to the data received by the last conference_title callback.

@param title A valid memory region large enough to store the title. If this parameter is NULL, this function has no effect.

@return true on success.

toxConferenceSetTitle :: ToxPtr -> Word32 -> ByteString -> IO (Either ErrConferenceTitle Bool)

Set the conference title and broadcast it to the rest of the conference.

Title length cannot be longer than TOX_MAX_NAME_LENGTH.

@return true on success.

toxConferenceGetChatlist :: ToxPtr -> IO [Word32]

Copy a list of valid conference IDs into the array chatlist. Determine how much space to allocate for the array with the tox_conference_get_chatlist_size function.

toxConferenceGetType :: ToxPtr -> Word32 -> IO (Either ErrConferenceGetType ConferenceType)

toxFriendLossyPacket :: ToxPtr -> Word32 -> ByteString -> IO (Either ErrFriendCustomPacket Bool)

Send a custom lossy packet to a friend.

The first byte of data must be in the range 200-254. Maximum length of a custom packet is tox_max_custom_packet_size.

Lossy packets behave like UDP packets, meaning they might never reach the other side or might arrive more than once (if someone is messing with the connection) or might arrive in the wrong order.

Unless latency is an issue, it is recommended that you use lossless custom packets instead.

param friend_number The friend number of the friend this lossy packet should be sent to. param data A byte array containing the packet data. @param length The length of the packet data byte array.

@return true on success.

toxFriendLosslessPacket :: ToxPtr -> Word32 -> ByteString -> IO (Either ErrFriendCustomPacket Bool)

Send a custom lossless packet to a friend.

The first byte of data must be in the range 160-191. Maximum length of a custom packet is tox_max_custom_packet_size.

Lossless packet behaviour is comparable to TCP (reliability, arrive in order) but with packets instead of a stream.

param friend_number The friend number of the friend this lossless packet should be sent to. param data A byte array containing the packet data. @param length The length of the packet data byte array.

@return true on success.

toxSelfGetDhtId :: ToxPtr -> IO ByteString

Writes the temporary DHT public key of this instance to a byte array.

This can be used in combination with an externally accessible IP address and the bound port (from tox_self_get_udp_port) to run a temporary bootstrap node.

Be aware that every time a new instance is created, the DHT public key changes, meaning this cannot be used to run a permanent bootstrap node.

@param dht_id A memory region of at least tox_public_key_size bytes. If this parameter is nullPtr, this function has no effect.

toxSelfGetUdpPort :: ToxPtr -> IO (Either ErrGetPort Word16)

Return the UDP port this Tox instance is bound to.

toxSelfGetTcpPort :: ToxPtr -> IO (Either ErrGetPort Word16)

Return the TCP port this Tox instance is bound to. This is only relevant if the instance is acting as a TCP relay.