GainSpan Wi-Fi library

File content as of revision 5:78943b3945b5:

/* Copyright (C) 2012 mbed.org, MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
 * and associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
/* Copyright (C) 2013 gsfan, MIT License
 *  port to the GainSpan Wi-FI module GS1011
 */

#include "TCPSocketConnection.h"
#include <algorithm>

TCPSocketConnection::TCPSocketConnection() {}

int TCPSocketConnection::connect(const char* host, const int port)
{  
    char cmd[CFG_CMD_SIZE];
    char ip[16];

    if (_cid < 0 || !_wifi->is_connected(_cid)) {
        // Socket open
        if (_wifi->gethostbyname(host, ip) == false) return -1;
        _server = false;
        sprintf(cmd, "AT+NCTCP=%s,%d", ip, port);
        if (_wifi->sendCommand(cmd, GSwifi::RES_CONNECT) == false) return -1;
        _cid = _wifi->readCID();
        return 0;
    }

    return -1;
}

bool TCPSocketConnection::is_connected(void)
{
    return _wifi->is_connected(_cid);
}

int TCPSocketConnection::send(char* data, int length)
{
    char cmd[CFG_CMD_SIZE];
    Timer tmr;

    if (!_blocking) {
        tmr.start();
        while (tmr.read_ms() < _timeout) {
            if (_wifi->writeable())
                break;
        }
        if (tmr.read_ms() >= _timeout) {
            return -1;
        }
    }

    // TCP Client/Server
    sprintf(cmd, "\x1bZ%X%04d", _cid, length);
    _wifi->send(cmd, strlen(cmd));
    return _wifi->send(data, length, GSwifi::RES_NORMAL);
}

// -1 if unsuccessful, else number of bytes written
int TCPSocketConnection::send_all(char* data, int length)
{
    char cmd[CFG_CMD_SIZE];
    Timer tmr;
    int idx = 0;
    tmr.start();

    // TCP Client/Server
    sprintf(cmd, "\x1bZ%X%04d", _cid, length);
    _wifi->send(cmd, strlen(cmd));

    while ((tmr.read_ms() < _timeout) || _blocking) {

        idx += _wifi->send(data, length, GSwifi::RES_NORMAL);

        if (idx == -1) return -1;
        if (idx == length)
            return idx;
    }
    return (idx == 0) ? -1 : idx;
}

// -1 if unsuccessful, else number of bytes received
int TCPSocketConnection::receive(char* data, int length)
{
    Timer tmr;
    int time = -1;
    
    
    if (!_blocking) {
        tmr.start();
        while (time < _timeout + 20) {
            if (_wifi->readable(_cid)) {
                break;
            }
            time = tmr.read_ms();
        }
        if (time >= _timeout + 20) {
            return -1;
        }
    }


    while(!_wifi->readable(_cid));
    int nb_available = _wifi->readable(_cid);
    for (int i = 0; i < min(nb_available, length); i++) {
        data[i] = _wifi->getc(_cid);
    }

    return min(nb_available, length);
}


// -1 if unsuccessful, else number of bytes received
int TCPSocketConnection::receive_all(char* data, int length)
{
    Timer tmr;
    int idx = 0;
    int time = -1;

    tmr.start();
    
    while (time < _timeout || _blocking) {

        int nb_available = _wifi->readable(_cid);
        for (int i = 0; i < min(nb_available, length); i++) {
            data[idx++] = _wifi->getc(_cid);
        }

        if (idx == length)
            break;

        time = tmr.read_ms();
    }

    return (idx == 0) ? -1 : idx;
}

void TCPSocketConnection::confCID (int cid) {
    char *ip;
    int port;
    _server = true;
    _cid = cid;
    if (_wifi->readRemote(_cid, &ip, &port)) {
        set_address(ip, port);
    }
}