TCP socket connection. More...

#include <TCPSocket.h>

Inherited by TCPServer.

Public Member Functions
	TCPSocket ()
	Create an uninitialized socket.
template<typename S >
	TCPSocket (S *stack)
	Create a socket on a network interface.
virtual	~TCPSocket ()
	Destroy a socket.
virtual int	join_multicast_group (const SocketAddress &address)
	Override multicast functions to return error for TCP.
nsapi_error_t	connect (const char *host, uint16_t port)
	Connects TCP socket to a remote host.
virtual nsapi_error_t	connect (const SocketAddress &address)
	Connects TCP socket to a remote host.
virtual nsapi_size_or_error_t	send (const void *data, nsapi_size_t size)
	Send data over a TCP socket.
virtual nsapi_size_or_error_t	recv (void *data, nsapi_size_t size)
	Receive data over a TCP socket.
virtual nsapi_size_or_error_t	sendto (const SocketAddress &address, const void *data, nsapi_size_t size)
	Send data on a socket.
virtual nsapi_size_or_error_t	recvfrom (SocketAddress address, void data, nsapi_size_t size)
	Receive a data from a socket.
virtual TCPSocket *	accept (nsapi_error_t *error=NULL)
	Accepts a connection on a socket.
virtual nsapi_error_t	listen (int backlog=1)
	Listen for incoming connections.
nsapi_error_t	open (NetworkStack *stack)
	Open a network socket on the network stack of the given network interface.
virtual nsapi_error_t	close ()
	Close any open connection, and deallocate any memory associated with the socket.
int	leave_multicast_group (const SocketAddress &address)
	Leave an IP multicast group.
nsapi_error_t	bind (uint16_t port)
	Bind the socket to a port on which to receive data.
nsapi_error_t	bind (const char *address, uint16_t port)
	Bind the socket to a specific address and port on which to receive data.
virtual nsapi_error_t	bind (const SocketAddress &address)
virtual void	set_blocking (bool blocking)
virtual void	set_timeout (int timeout)
virtual nsapi_error_t	setsockopt (int level, int optname, const void *optval, unsigned optlen)
virtual nsapi_error_t	getsockopt (int level, int optname, void optval, unsigned optlen)
virtual void	sigio (mbed::Callback< void()> func)
template<typename T , typename M >
MBED_DEPRECATED_SINCE("mbed-os-5.4","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(mbed	MBED_DEPRECATED_SINCE ("mbed-os-5.1","The attach function does not support cv-qualifiers. Replaced by ""attach(callback(obj, method)).") void attach(T *obj
	Register a callback on state change of the socket.

Detailed Description

TCP socket connection.

Definition at line 31 of file TCPSocket.h.

Constructor & Destructor Documentation

TCPSocket ( )

Create an uninitialized socket.

Must call open to initialize the socket on a network stack.

Definition at line 21 of file TCPSocket.cpp.

TCPSocket ( S * stack )

Create a socket on a network interface.

Creates and opens a socket on the network stack of the given network interface.

Parameters:

stack Network stack as target for socket

Definition at line 47 of file TCPSocket.h.

~TCPSocket ( ) [virtual]

Destroy a socket.

Closes socket if the socket is still open

Definition at line 36 of file TCPSocket.cpp.

Member Function Documentation

TCPSocket * accept ( nsapi_error_t * error = NULL ) [virtual]

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 which user is expected to call close() and that deallocates the resources. Referencing a returned pointer after a close() call is not allowed and leads to undefined behaviour.

By default, accept blocks until incomming 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

Implements Socket.

Definition at line 258 of file TCPSocket.cpp.

nsapi_error_t bind	(	const char *	address,
		uint16_t	port
	)		`[inherited]`

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).

Definition at line 125 of file InternetSocket.cpp.

nsapi_error_t bind ( const SocketAddress & address ) [virtual, inherited]

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.

Definition at line 132 of file InternetSocket.cpp.

nsapi_error_t bind ( uint16_t port ) [inherited]

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).

Definition at line 118 of file InternetSocket.cpp.

nsapi_error_t close ( void ) [virtual, inherited]

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.

Definition at line 59 of file InternetSocket.cpp.

nsapi_error_t connect	(	const char *	host,
		uint16_t	port
	)

Connects TCP socket to a remote host.

Initiates a connection to a remote server specified by either a domain name or an IP address and a port.

Parameters:

host	Hostname of the remote host
port	Port of the remote host

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

Definition at line 103 of file TCPSocket.cpp.

nsapi_error_t connect ( const SocketAddress & address ) [virtual]

Connects TCP socket to a remote host.

Initiates a connection to a remote server specified by the indicated address.

Parameters:

address The SocketAddress of the remote host

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

Implements Socket.

Definition at line 45 of file TCPSocket.cpp.

nsapi_error_t getsockopt	(	int	level,
		int	optname,
		void *	optval,
		unsigned *	optlen
	)		`[virtual, inherited]`

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.

Definition at line 181 of file InternetSocket.cpp.

virtual int join_multicast_group ( const SocketAddress & address ) [virtual]

Override multicast functions to return error for TCP.

Reimplemented from InternetSocket.

Definition at line 61 of file TCPSocket.h.

int leave_multicast_group ( const SocketAddress & address ) [inherited]

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).

Definition at line 112 of file InternetSocket.cpp.

nsapi_error_t listen ( int backlog = 1 ) [virtual]

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:: 0 on success, negative error code on failure

Implements Socket.

Definition at line 243 of file TCPSocket.cpp.

MBED_DEPRECATED_SINCE ("mbed-os-5.4", "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(mbed MBED_DEPRECATED_SINCE	(	"mbed-os-5.1"	,
		"The attach function does not support cv-qualifiers. Replaced by ""attach(callback(obj, method))."
	)		`[inherited]`

Register a callback on state change of the socket.

See also:: Socket::sigio

Register a callback on state change of the socket.

See also:: Socket::sigio

nsapi_error_t open ( NetworkStack * stack ) [inherited]

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).

Definition at line 34 of file InternetSocket.cpp.

nsapi_size_or_error_t recv	(	void *	data,
		nsapi_size_t	size
	)		`[virtual]`

Receive data over a TCP socket.

The socket must be connected to a remote host. Returns the number of bytes received into the buffer.

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.

Implements Socket.

Definition at line 188 of file TCPSocket.cpp.

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

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.

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

Implements Socket.

Definition at line 235 of file TCPSocket.cpp.

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

Send data over a TCP socket.

The socket must be connected to a remote host. Returns the number of bytes sent from the buffer.

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

Implements Socket.

Definition at line 117 of file TCPSocket.cpp.

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

Send data on a socket.

TCP socket is connection oriented protocol, so 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

Implements Socket.

Definition at line 182 of file TCPSocket.cpp.

void set_blocking ( bool blocking ) [virtual, inherited]

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 can not 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.

Definition at line 147 of file InternetSocket.cpp.

void set_timeout ( int timeout ) [virtual, inherited]

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 give 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.

Definition at line 153 of file InternetSocket.cpp.

nsapi_error_t setsockopt	(	int	level,
		int	optname,
		const void *	optval,
		unsigned	optlen
	)		`[virtual, inherited]`

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.

Definition at line 166 of file InternetSocket.cpp.

virtual void sigio ( mbed::Callback< void()> func ) [virtual, inherited]

Register a callback on state change of the socket.

The specified callback will be called on state changes such as when the socket can recv/send/accept successfully and on 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 recv/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 when the registered function is called is not guaranteed and susceptible to change.

Parameters:

func	Function to call on state change.

Implements Socket.

Type:	Program
Created:	12 Feb 2019
Imports:	15
Forks:	0
Commits:	7
Dependents:	0
Dependencies:	3
Followers:	1

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