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Public Member Functions
UDPSocket Class Reference

UDP socket implementation. More...

#include <UDPSocket.h>

Inheritance diagram for UDPSocket:
InternetDatagramSocket InternetSocket Socket

Public Member Functions

 UDPSocket ()
 Create an uninitialized socket. More...
 
nsapi_size_or_error_t sendto (const SocketAddress &address, const void *data, nsapi_size_t size) override
 Send data to the specified address. More...
 
nsapi_size_or_error_t recvfrom (SocketAddress *address, void *data, nsapi_size_t size) override
 Receive a datagram and store the source address in address if it's not NULL. More...
 
nsapi_error_t connect (const SocketAddress &address) override
 Set the remote address for next send() call and filtering of incoming packets. More...
 
nsapi_size_or_error_t send (const void *data, nsapi_size_t size) override
 Send a raw data to connected remote address. More...
 
nsapi_size_or_error_t recv (void *data, nsapi_size_t size) override
 Receive data from a socket. More...
 
Socketaccept (nsapi_error_t *error=nullptr) override
 Not implemented for InternetDatagramSocket. More...
 
nsapi_error_t listen (int backlog=1) override
 Not implemented for InternetDatagramSocket. More...
 
nsapi_error_t open (NetworkStack *stack)
 Open a network socket on the network stack of the given network interface. More...
 
nsapi_error_t close () override
 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...
 
int get_rtt_estimate_to_address (const SocketAddress &address, uint32_t *rtt_estimate)
 Get estimated round trip time to destination address. More...
 
int get_stagger_estimate_to_address (const SocketAddress &address, uint16_t data_amount, uint16_t *stagger_min, uint16_t *stagger_max, uint16_t *stagger_rand)
 Get estimated stagger value. 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 SocketAddress &address) override
 Bind a specific address to a socket. More...
 
void set_blocking (bool blocking) override
 Set blocking or non-blocking mode of the socket. More...
 
void set_timeout (int timeout) override
 Set timeout on blocking socket operations. More...
 
nsapi_error_t setsockopt (int level, int optname, const void *optval, unsigned optlen) override
 Set socket options. More...
 
nsapi_error_t getsockopt (int level, int optname, void *optval, unsigned *optlen) override
 Get socket options. More...
 
void sigio (mbed::Callback< void()> func) override
 Register a callback on state change of the socket. More...
 
nsapi_error_t getpeername (SocketAddress *address) override
 Get the remote-end peer associated with this socket. More...
 

Detailed Description

UDP socket implementation.

Definition at line 33 of file UDPSocket.h.

Constructor & Destructor Documentation

UDPSocket ( )

Create an uninitialized socket.

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

Member Function Documentation

Socket* accept ( nsapi_error_t error = nullptr)
overridevirtualinherited

Not implemented for InternetDatagramSocket.

Parameters
errorNot used.
Returns
NSAPI_ERROR_UNSUPPORTED

Implements Socket.

nsapi_error_t bind ( uint16_t  port)
inherited

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

Parameters
portLocal port to bind.
Return values
NSAPI_ERROR_OKon success.
NSAPI_ERROR_NO_SOCKETif socket is not open.
intnegative error codes for stack-related failures. See NetworkStack::socket_bind.
nsapi_error_t bind ( const SocketAddress address)
overridevirtualinherited

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
addressLocal address to bind.
Returns
NSAPI_ERROR_OK on success, negative subclass-dependent error code on failure.

Implements Socket.

nsapi_error_t close ( )
overridevirtualinherited

defined(DOXYGEN_ONLY)

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

Return values
NSAPI_ERROR_OKon success.
NSAPI_ERROR_NO_SOCKETif socket is not open.
intnegative error codes for stack-related failures. See NetworkStack::socket_close.

Implements Socket.

nsapi_error_t connect ( const SocketAddress address)
overridevirtualinherited

Set the remote address for next send() call and filtering of incoming packets.

To reset the address, zero initialized SocketAddress must be in the address parameter.

Parameters
addressThe SocketAddress of the remote host.
Returns
NSAPI_ERROR_OK on success.

Implements Socket.

int get_rtt_estimate_to_address ( const SocketAddress address,
uint32_t *  rtt_estimate 
)
inherited

Get estimated round trip time to destination address.

Use estimated round trip time to adjust application retry timers to work in networks that have low data rate and high latency.

Parameters
addressDestination address to use in rtt estimate.
rtt_estimateReturned round trip time value in milliseconds.
Returns
NSAPI_ERROR_OK on success.
NSAPI_ERROR_PARAMETER if the provided pointer is invalid.
negative error code on other failures (
See also
InternetSocket::getsockopt).
int get_stagger_estimate_to_address ( const SocketAddress address,
uint16_t  data_amount,
uint16_t *  stagger_min,
uint16_t *  stagger_max,
uint16_t *  stagger_rand 
)
inherited

Get estimated stagger value.

Stagger value is a time that application should wait before using heavy network operations after connecting to network. Purpose of staggering is to avoid network congestion that may happen in low bandwith networks if multiple applications simultaneously start heavy network usage after joining to the network.

Parameters
addressDestination added used to estimate stagger value.
data_amountAmount of bytes to transfer in kilobytes.
stagger_minMinimum stagger value in seconds.
stagger_maxMaximum stagger value in seconds.
stagger_randRandomized stagger value between stagger_min and stagger_max in seconds.
Returns
NSAPI_ERROR_OK on success.
negative error code on other failures (
See also
InternetSocket::getsockopt).
nsapi_error_t getpeername ( SocketAddress address)
overridevirtualinherited

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
addressPointer to SocketAddress structure.
Return values
NSAPI_ERROR_OKon success.
NSAPI_ERROR_NO_SOCKETif socket is not connected.
NSAPI_ERROR_NO_CONNECTIONif the remote peer was not set.

Implements Socket.

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

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
levelStack-specific protocol level or nsapi_socket_level_t.
optnameLevel-specific option name.
optvalDestination for option value.
optlenLength of the option value.
Return values
NSAPI_ERROR_OKon success.
NSAPI_ERROR_NO_SOCKETif socket is not open.
intNegative error code on failure, see NetworkStack::getsockopt.

Implements Socket.

int join_multicast_group ( const SocketAddress address)
inherited

Subscribe to an IP multicast group.

Parameters
addressMulticast group IP address.
Returns
NSAPI_ERROR_OK on success, negative error code on failure (
See also
InternetSocket::setsockopt).
int leave_multicast_group ( const SocketAddress address)
inherited

Leave an IP multicast group.

Parameters
addressMulticast group IP address.
Returns
NSAPI_ERROR_OK on success, negative error code on failure (
See also
InternetSocket::setsockopt).
nsapi_error_t listen ( int  backlog = 1)
overridevirtualinherited

Not implemented for InternetDatagramSocket.

Parameters
backlogNot used.
Returns
NSAPI_ERROR_UNSUPPORTED

Implements Socket.

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
stackNetwork stack as target for socket.
Return values
NSAPI_ERROR_OKon success.
NSAPI_ERROR_PARAMETERin case the provided stack was invalid or a stack was already created and socket opened successfully.
intnegative error codes for stack-related failures. See NetworkStack::socket_open.
nsapi_size_or_error_t recv ( void *  data,
nsapi_size_t  size 
)
overridevirtualinherited

Receive data from a socket.

This is equivalent to calling recvfrom(NULL, data, size).

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

Note
recv() is allowed write to data buffer even if error occurs.
Parameters
dataPointer to buffer for data received from the host.
sizeSize of the buffer in bytes.
Return values
intNumber of received bytes on success.
NSAPI_ERROR_NO_SOCKETin case socket was not created correctly.
NSAPI_ERROR_WOULD_BLOCKin case non-blocking mode is enabled and send cannot be performed immediately.
intOther negative error codes for stack-related failures. See NetworkStack::socket_recv.

Implements Socket.

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

Receive a datagram and store the source address in address if it's not NULL.

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

Note
If the datagram is larger than the buffer, the excess data is silently discarded.
If socket is connected, only packets coming from connected peer address are accepted.
recvfrom() is allowed write to address and data buffers even if error occurs.
Parameters
addressDestination for the source address or NULL.
dataDestination buffer for RAW data to be received from the host.
sizeSize of the buffer in bytes.
Return values
intNumber of received bytes on success.
NSAPI_ERROR_NO_SOCKETin case socket was not created correctly.
NSAPI_ERROR_WOULD_BLOCKin case non-blocking mode is enabled and send cannot be performed immediately.
intOther negative error codes for stack-related failures. See NetworkStack::socket_recv.

Implements Socket.

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

Send a raw data to connected remote address.

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

Note
The socket must be connected to a remote host before send() call.
Parameters
dataBuffer of data to send to the host.
sizeSize of the buffer in bytes.
Return values
intNumber of sent bytes on success.
NSAPI_ERROR_NO_SOCKETin case socket was not created correctly.
NSAPI_ERROR_WOULD_BLOCKin case non-blocking mode is enabled and send cannot be performed immediately. #retval NSAPI_ERROR_NO_ADDRESS if the address was not set with connect().
intOther negative error codes for stack-related failures. See NetworkStack::socket_send.

Implements Socket.

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

Send data to the specified address.

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

Parameters
addressThe SocketAddress of the remote host.
dataBuffer of data to send to the host.
sizeSize of the buffer in bytes.
Return values
NSAPI_ERROR_NO_SOCKETin case socket was not created correctly.
NSAPI_ERROR_WOULD_BLOCKin case non-blocking mode is enabled and send cannot be performed immediately.
intOther negative error codes for stack-related failures. See NetworkStack::socket_send.

Implements Socket.

void set_blocking ( bool  blocking)
overridevirtualinherited

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

Implements Socket.

void set_timeout ( int  timeout)
overridevirtualinherited

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
timeoutTimeout in milliseconds

Implements Socket.

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

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
levelStack-specific protocol level or nsapi_socket_level_t.
optnameLevel-specific option name.
optvalOption value.
optlenLength of the option value.
Return values
NSAPI_ERROR_OKon success.
NSAPI_ERROR_NO_SOCKETif socket is not open.
intNegative error code on failure, see NetworkStack::setsockopt.

Implements Socket.

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

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
funcFunction to call on state change.

Implements Socket.

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