NetworkSocketAPI / NetworkSocketAPI

Base class for IP Based Networking Libraries

Dependencies:   DnsQuery

Dependents:   TempTower BSDInterfaceTests HelloBSDInterface ESP8266InterfaceTests ... more

For a complete getting started guide see the wiki...

Network Socket API

The Network Socket API provides a common interface for using sockets on network devices. The API provides a simple class-based interface that should be familiar to users experienced with other socket APIs. Additionally, the API provides a simple interface for implementing network devices, making it easy to connect hardware agnostic programs to new devices.

Network Interfaces

The NetworkInterface provides an abstract class for network devices that support sockets. Devices should provide a DeviceInterface class that inherits this interface and adds implementation specific methods for using the device. A NetworkInterface must be provided to a Socket constructor to open a socket on the interface. Currently two subclasses are defined for common devices, EthernetInterface and WiFiInterface.

Sockets

The Socket class is used for managing network sockets. Once opened, the socket provides a pipe through which data can sent and recieved to a specific endpoint. The socket class can be instantiated as either a TCPSocket or a UDPSocket which defines the protocol used for the connection.

TCPSocket.cpp

Committer:
dkato
Date:
2016-05-25
Revision:
125:ea3a618e0818
Parent:
118:96627c4b83d5

File content as of revision 125:ea3a618e0818:

/* Socket
 * Copyright (c) 2015 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "TCPSocket.h"
#include "Timer.h"

TCPSocket::TCPSocket()
{
}

TCPSocket::TCPSocket(NetworkStack *iface)
{
    open(iface);
}

int TCPSocket::open(NetworkStack *iface)
{
    return Socket::open(iface, NSAPI_TCP);
}

int TCPSocket::connect(const SocketAddress &addr)
{
    if (!_socket) {
        return NSAPI_ERROR_NO_SOCKET;
    }

    return _iface->socket_connect(_socket, addr);
}

int TCPSocket::connect(const char *host, uint16_t port)
{
    SocketAddress addr(_iface, host, port);
    if (!addr) {
        return NSAPI_ERROR_DNS_FAILURE;
    }

    return connect(addr);
}

int TCPSocket::send(const void *data, unsigned size)
{
    mbed::Timer timer;
    timer.start();
    mbed::Timeout timeout;
    if (_timeout >= 0) {
        timeout.attach_us(&Socket::wakeup, _timeout * 1000);
    }

    while (true) {
        if (!_socket) {
            return NSAPI_ERROR_NO_SOCKET;
        }

        int sent = _iface->socket_send(_socket, data, size);
        if (sent != NSAPI_ERROR_WOULD_BLOCK
            || (_timeout >= 0 && timer.read_ms() >= _timeout)) {
            return sent;
        }

        __WFI();
    }
}

int TCPSocket::recv(void *data, unsigned size)
{
    mbed::Timer timer;
    timer.start();
    mbed::Timeout timeout;
    if (_timeout >= 0) {
        timeout.attach_us(&Socket::wakeup, _timeout * 1000);
    }

    while (true) {
        if (!_socket) {
            return NSAPI_ERROR_NO_SOCKET;
        }
    
        int recv = _iface->socket_recv(_socket, data, size);
        if (recv != NSAPI_ERROR_WOULD_BLOCK
            || (_timeout >= 0 && timer.read_ms() >= _timeout)) {
            return recv;
        }

        __WFI();
    }
}