Socket implementation that uses IP network stack. More...

#include <InternetSocket.h>

Inheritance diagram for InternetSocket:

Public Member Functions
virtual	~InternetSocket ()
	Destroy the socket. More...

nsapi_error_t	open (NetworkStack *stack)
	Open a network socket on the network stack of the given network interface. More...

virtual nsapi_error_t	close ()
	defined(DOXYGEN_ONLY) More...

int	join_multicast_group (const SocketAddress &address)
	Subscribe to an IP multicast group. More...

int	leave_multicast_group (const SocketAddress &address)
	Leave an IP multicast group. More...

nsapi_error_t	bind (uint16_t port)
	Bind the socket to a port on which to receive data. More...

nsapi_error_t	bind (const char *address, uint16_t port)
	Bind the socket to a specific address and port on which to receive data. More...

virtual nsapi_error_t	bind (const SocketAddress &address)
	Bind a specific address to a socket. More...

virtual void	set_blocking (bool blocking)
	Set blocking or non-blocking mode of the socket. More...

virtual void	set_timeout (int timeout)
	Set timeout on blocking socket operations. More...

virtual nsapi_error_t	setsockopt (int level, int optname, const void *optval, unsigned optlen)
	Set socket options. More...

virtual nsapi_error_t	getsockopt (int level, int optname, void optval, unsigned optlen)
	Get socket options. More...

virtual void	sigio (mbed::Callback< void()> func)
	Register a callback on state change of the socket. More...

virtual nsapi_error_t	getpeername (SocketAddress *address)
	Get the remote-end peer associated with this socket. More...

void	attach (mbed::Callback< void()> func)
	Register a callback on state change of the socket. More...

template<typename T , typename M >
void	attach (T *obj, M method)
	Register a callback on state change of the socket. More...

virtual nsapi_error_t	connect (const SocketAddress &address)=0
	Connects socket to a remote address. More...

virtual nsapi_size_or_error_t	send (const void *data, nsapi_size_t size)=0
	Send data on a socket. More...

virtual nsapi_size_or_error_t	recv (void *data, nsapi_size_t size)=0
	Receive data from a socket. More...

virtual nsapi_size_or_error_t	sendto (const SocketAddress &address, const void *data, nsapi_size_t size)=0
	Send a message on a socket. More...

virtual nsapi_size_or_error_t	recvfrom (SocketAddress address, void data, nsapi_size_t size)=0
	Receive a data from a socket. More...

virtual Socket *	accept (nsapi_error_t *error=NULL)=0
	Accepts a connection on a socket. More...

virtual nsapi_error_t	listen (int backlog=1)=0
	Listen for incoming connections. More...

Detailed Description

Socket implementation that uses IP network stack.

Not to be directly used by applications. Cannot be directly instantiated.

Definition at line 35 of file InternetSocket.h.

Constructor & Destructor Documentation

virtual ~InternetSocket ( )

virtual

Destroy the socket.

Note: Closes socket if it's still open.

Member Function Documentation

virtual Socket* accept ( nsapi_error_t * error = NULL )

pure virtualinherited

Accepts a connection on a socket.

The server socket must be bound and set to listen for connections. On a new connection, returns connected network socket to call close() that deallocates the resources. Referencing a returned pointer after a close() call is not allowed and leads to undefined behavior.

By default, accept blocks until incoming connection occurs. If socket is set to non-blocking or times out, error is set to NSAPI_ERROR_WOULD_BLOCK.

Parameters

error Pointer to storage of the error value or NULL.

Returns: Pointer to a socket.

Implemented in TCPSocket, TLSSocketWrapper, InternetDatagramSocket, and CellularNonIPSocket.

void attach ( mbed::Callback< void()> func )

Register a callback on state change of the socket.

See also: Socket::sigio

Deprecated:: The behavior of Socket::attach differs from other attach functions in Mbed OS and has been known to cause confusion. Replaced by Socket::sigio.

void attach	(	T *	obj,
		M	method
	)

Register a callback on state change of the socket.

See also: Socket::sigio

Deprecated:: The attach function does not support cv-qualifiers. Replaced by attach(callback(obj, method)).

Definition at line 149 of file InternetSocket.h.

nsapi_error_t bind ( uint16_t port )

Bind the socket to a port on which to receive data.

Parameters

port	Local port to bind.

Returns: 0 on success, negative error code on failure (

See also: nsapi_types.h).

nsapi_error_t bind	(	const char *	address,
		uint16_t	port
	)

Bind the socket to a specific address and port on which to receive data.

If the IP address is zeroed, only the port is bound.

Parameters

address	Null-terminated local address to bind.
port	Local port to bind.

Returns: 0 on success, negative error code on failure (

See also: nsapi_types.h).

virtual nsapi_error_t bind ( const SocketAddress & address )

virtual

Bind a specific address to a socket.

Binding a socket specifies the address and port on which to receive data. If the IP address is zeroed, only the port is bound.

Parameters

address Local address to bind.

Returns: NSAPI_ERROR_OK on success, negative error code on failure.

Implements Socket.

virtual nsapi_error_t close ( )

virtual

defined(DOXYGEN_ONLY)

Close any open connection, and deallocate any memory associated with the socket. Called from destructor if socket is not closed.

Returns: 0 on success, negative error code on failure (

See also: nsapi_types.h).

Implements Socket.

virtual nsapi_error_t connect ( const SocketAddress & address )

pure virtualinherited

Connects socket to a remote address.

Attempts to make connection on connection-mode protocol or set or reset the peer address on connectionless protocol.

Connectionless protocols also use the connected address to filter incoming packets for recv() and recvfrom() calls.

To reset the peer address, there must be zero initialized(default constructor) SocketAddress objects in the address parameter.

Note: If connect() fails it is recommended to close the Socket and create a new one before attempting to reconnect.

Parameters

address The SocketAddress of the remote peer.

Returns: NSAPI_ERROR_OK on success, negative error code on failure.

Implemented in TLSSocketWrapper, CellularNonIPSocket, InternetDatagramSocket, and TCPSocket.

virtual nsapi_error_t getpeername ( SocketAddress * address )

virtual

Get the remote-end peer associated with this socket.

Copy the remote peer address to a SocketAddress structure pointed by address parameter. Socket must be connected to have a peer address associated.

Parameters

address Pointer to SocketAddress structure.

Returns: NSAPI_ERROR_OK on success, negative error code on failure.

Implements Socket.

virtual nsapi_error_t getsockopt	(	int	level,
		int	optname,
		void *	optval,
		unsigned *	optlen
	)

virtual

Get socket options.

getsockopt() allows an application to retrieve stack-specific options from the underlying stack using stack-specific level and option names, or to request generic options using levels from nsapi_socket_level_t.

For unsupported options, NSAPI_ERROR_UNSUPPORTED is returned and the socket is unmodified.

Parameters

level	Stack-specific protocol level or nsapi_socket_level_t.
optname	Level-specific option name.
optval	Destination for option value.
optlen	Length of the option value.

Returns: NSAPI_ERROR_OK on success, negative error code on failure.

Implements Socket.

int join_multicast_group ( const SocketAddress & address )

Subscribe to an IP multicast group.

Parameters

address Multicast group IP address.

Returns: 0 on success, negative error code on failure (

See also: nsapi_types.h).

int leave_multicast_group ( const SocketAddress & address )

Leave an IP multicast group.

Parameters

address Multicast group IP address.

Returns: 0 on success, negative error code on failure (

See also: nsapi_types.h).

virtual nsapi_error_t listen ( int backlog = 1 )

pure virtualinherited

Listen for incoming connections.

Marks the socket as a passive socket that can be used to accept incoming connections.

Parameters

backlog Number of pending connections that can be queued simultaneously, defaults to 1.

Returns: NSAPI_ERROR_OK on success, negative error code on failure.

Implemented in TCPSocket, TLSSocketWrapper, InternetDatagramSocket, and CellularNonIPSocket.

nsapi_error_t open ( NetworkStack * stack )

Open a network socket on the network stack of the given network interface.

Note: Not needed if stack is passed to the socket's constructor.

Parameters

stack Network stack as target for socket.

Returns: 0 on success, negative error code on failure (

See also: nsapi_types.h).

virtual nsapi_size_or_error_t recv	(	void *	data,
		nsapi_size_t	size
	)

pure virtualinherited

Receive data from a socket.

Receive data from connected socket, or in the case of connectionless socket, equivalent to calling recvfrom(NULL, data, size).

If socket is connected, only packets coming from connected peer address are accepted.

Note: recv() is allowed write to data buffer even if an error occurs.

By default, recv blocks until some data is received. If socket is set to non-blocking or times out, NSAPI_ERROR_WOULD_BLOCK can be returned to indicate no data.

Parameters

data	Destination buffer for data received from the host.
size	Size of the buffer in bytes.

Returns: Number of received bytes on success, negative error code on failure. If no data is available to be received and the peer has performed an orderly shutdown, recv() returns 0.

Implemented in TLSSocketWrapper, TCPSocket, InternetDatagramSocket, and CellularNonIPSocket.

virtual nsapi_size_or_error_t recvfrom	(	SocketAddress *	address,
		void *	data,
		nsapi_size_t	size
	)

pure virtualinherited

Receive a data from a socket.

Receives a data and stores the source address in address if address is not NULL. Returns the number of bytes written into the buffer.

If socket is connected, only packets coming from connected peer address are accepted.

Note: recvfrom() is allowed write to address and data buffers even if error occurs.

By default, recvfrom blocks until a datagram is received. If socket is set to non-blocking or times out with no data, NSAPI_ERROR_WOULD_BLOCK is returned.

Parameters

address	Destination for the source address or NULL
data	Destination buffer for datagram received from the host
size	Size of the buffer in bytes

Returns: Number of received bytes on success, negative error code on failure

Implemented in TCPSocket, TLSSocketWrapper, CellularNonIPSocket, and InternetDatagramSocket.

virtual nsapi_size_or_error_t send	(	const void *	data,
		nsapi_size_t	size
	)

pure virtualinherited

Send data on a socket.

The socket must be connected to a remote host before send() call. Returns the number of bytes sent from the buffer. In case of connectionless socket, sends data to pre-specified remote.

By default, send blocks until all data is sent. If socket is set to non-blocking or times out, a partial amount can be written. NSAPI_ERROR_WOULD_BLOCK is returned if no data was written.

Parameters

data	Buffer of data to send to the host.
size	Size of the buffer in bytes.

Returns: Number of sent bytes on success, negative error code on failure.

Implemented in TLSSocketWrapper, InternetDatagramSocket, TCPSocket, and CellularNonIPSocket.

virtual nsapi_size_or_error_t sendto	(	const SocketAddress &	address,
		const void *	data,
		nsapi_size_t	size
	)

pure virtualinherited

Send a message on a socket.

The sendto() function sends a message through a connection-mode or connectionless-mode socket. If the socket is a connectionless-mode socket, the message is sent to the address specified. If the socket is a connected-mode socket, address is ignored.

By default, sendto blocks until data is sent. If socket is set to non-blocking or times out, NSAPI_ERROR_WOULD_BLOCK is returned immediately.

Parameters

address	Remote address
data	Buffer of data to send to the host
size	Size of the buffer in bytes

Returns: Number of sent bytes on success, negative error code on failure

Implemented in TLSSocketWrapper, TCPSocket, CellularNonIPSocket, and InternetDatagramSocket.

virtual void set_blocking ( bool blocking )

virtual

Set blocking or non-blocking mode of the socket.

Initially all sockets are in blocking mode. In non-blocking mode blocking operations such as send/recv/accept return NSAPI_ERROR_WOULD_BLOCK if they cannot continue.

set_blocking(false) is equivalent to set_timeout(0) set_blocking(true) is equivalent to set_timeout(-1)

Parameters

blocking true for blocking mode, false for non-blocking mode.

Implements Socket.

virtual void set_timeout ( int timeout )

virtual

Set timeout on blocking socket operations.

Initially all sockets have unbounded timeouts. NSAPI_ERROR_WOULD_BLOCK is returned if a blocking operation takes longer than the specified timeout. A timeout of 0 removes the timeout from the socket. A negative value gives the socket an unbounded timeout.

set_timeout(0) is equivalent to set_blocking(false) set_timeout(-1) is equivalent to set_blocking(true)

Parameters

timeout Timeout in milliseconds

Implements Socket.

virtual nsapi_error_t setsockopt	(	int	level,
		int	optname,
		const void *	optval,
		unsigned	optlen
	)

virtual

Set socket options.

setsockopt() allows an application to pass stack-specific options to the underlying stack using stack-specific level and option names, or to request generic options using levels from nsapi_socket_level_t.

For unsupported options, NSAPI_ERROR_UNSUPPORTED is returned and the socket is unmodified.

Parameters

level	Stack-specific protocol level or nsapi_socket_level_t.
optname	Level-specific option name.
optval	Option value.
optlen	Length of the option value.

Returns: NSAPI_ERROR_OK on success, negative error code on failure.

Implements Socket.

virtual void sigio ( mbed::Callback< void()> func )

virtual

Register a callback on state change of the socket.

The specified callback is called on state changes, such as when the socket can receive/send/accept successfully and when an error occurs. The callback may also be called spuriously without reason.

The callback may be called in an interrupt context and should not perform expensive operations such as receive/send calls.

Note! This is not intended as a replacement for a poll or attach-like asynchronous API, but rather as a building block for constructing such functionality. The exact timing of the registered function is not guaranteed and susceptible to change.

Parameters

func	Function to call on state change.

Implements Socket.

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

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