source: rtos_arduino/trunk/arduino_lib/libraries/GSM/src/GSM3MobileClientService.cpp@ 136

/*
This file is part of the GSM3 communications library for Arduino
-- Multi-transport communications platform
-- Fully asynchronous
-- Includes code for the Arduino-Telefonica GSM/GPRS Shield V1
-- Voice calls
-- SMS
-- TCP/IP connections
-- HTTP basic clients

This library has been developed by Telefónica Digital - PDI -
- Physical Internet Lab, as part as its collaboration with
Arduino and the Open Hardware Community. 

September-December 2012

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

The latest version of this library can always be found at
https://github.com/BlueVia/Official-Arduino
*/
#include <GSM3MobileClientService.h>
#include <GSM3MobileClientProvider.h>
#include <Arduino.h>

// While there is only a shield (ShieldV1) we will include it by default
#include <GSM3ShieldV1ClientProvider.h>
GSM3ShieldV1ClientProvider theShieldV1ClientProvider;


#define GSM3MOBILECLIENTSERVICE_CLIENT 0x01 // 1: This side is Client. 0: This side is Server
#define GSM3MOBILECLIENTSERVICE_WRITING 0x02 // 1: TRUE 0: FALSE
#define GSM3MOBILECLIENTSERVICE_SYNCH 0x04 // 1: TRUE, compatible with other clients 0: FALSE

#define __TOUTBEGINWRITE__ 10000


GSM3MobileClientService::GSM3MobileClientService(bool synch)
{
        flags = GSM3MOBILECLIENTSERVICE_CLIENT;
        if(synch)
                flags |= GSM3MOBILECLIENTSERVICE_SYNCH;
        mySocket=255;
}

GSM3MobileClientService::GSM3MobileClientService(int socket, bool synch)
{
        // We are creating a socket on an existing, occupied one.
        flags=0;
        if(synch)
                flags |= GSM3MOBILECLIENTSERVICE_SYNCH;
        mySocket=socket;
        theGSM3MobileClientProvider->getSocket(socket);
        
}

// Returns 0 if last command is still executing
// 1 if success
// >1 if error 
int GSM3MobileClientService::ready()
{       
        return theGSM3MobileClientProvider->ready();
}

int GSM3MobileClientService::connect(IPAddress add, uint16_t port) 
{
        if(theGSM3MobileClientProvider==0)
                return 2;
                
        // TODO: ask for the socket id
        mySocket=theGSM3MobileClientProvider->getSocket();

        if(mySocket<0)
                return 2;
        
        int res=theGSM3MobileClientProvider->connectTCPClient(add, port, mySocket);
        if(flags & GSM3MOBILECLIENTSERVICE_SYNCH)
                res=waitForAnswer();
        
        return res;
};

int GSM3MobileClientService::connect(const char *host, uint16_t port)
{

        if(theGSM3MobileClientProvider==0)
                return 2;               
        // TODO: ask for the socket id
        mySocket=theGSM3MobileClientProvider->getSocket();

        if(mySocket<0)
                return 2;
        
        int res=theGSM3MobileClientProvider->connectTCPClient(host, port, mySocket);
        if(flags & GSM3MOBILECLIENTSERVICE_SYNCH)
                res=waitForAnswer();
                
        return res;
}

int GSM3MobileClientService::waitForAnswer()
{
        unsigned long m;
        m=millis();
        int res;
        
        while(((millis()-m)< __TOUTBEGINWRITE__ )&&(ready()==0)) 
                delay(100);
        
        res=ready();

        // If we get something different from a 1, we are having a problem
        if(res!=1)
                res=0;

        return res;
}

void GSM3MobileClientService::beginWrite(bool sync)
{
        flags |= GSM3MOBILECLIENTSERVICE_WRITING;
        theGSM3MobileClientProvider->beginWriteSocket(flags & GSM3MOBILECLIENTSERVICE_CLIENT, mySocket);
        if(sync)
                waitForAnswer();
}

size_t GSM3MobileClientService::write(uint8_t c)
{       
        if(!(flags & GSM3MOBILECLIENTSERVICE_WRITING))
                beginWrite(true);
        theGSM3MobileClientProvider->writeSocket(c);
        return 1;
}

size_t GSM3MobileClientService::write(const uint8_t* buf)
{
        if(!(flags & GSM3MOBILECLIENTSERVICE_WRITING))
                beginWrite(true);
        theGSM3MobileClientProvider->writeSocket((const char*)(buf));
        return strlen((const char*)buf);
}

size_t GSM3MobileClientService::write(const uint8_t* buf, size_t sz)
{
        if(!(flags & GSM3MOBILECLIENTSERVICE_WRITING))
                beginWrite(true);
        for(int i=0;i<sz;i++)
                theGSM3MobileClientProvider->writeSocket(buf[i]);
        return sz;
}

void GSM3MobileClientService::endWrite(bool sync)
{
        flags ^= GSM3MOBILECLIENTSERVICE_WRITING;
        theGSM3MobileClientProvider->endWriteSocket();
        if(sync)
                waitForAnswer();
}

uint8_t GSM3MobileClientService::connected()
{
        if(mySocket==255)
                return 0;
        return theGSM3MobileClientProvider->getStatusSocketClient(mySocket);     
}

GSM3MobileClientService::operator bool()
{
        return connected()==1;
};

int GSM3MobileClientService::available()
{
        int res;

        // Even if not connected, we are looking for available data
        
        if(flags & GSM3MOBILECLIENTSERVICE_WRITING)
                endWrite(true);

        res=theGSM3MobileClientProvider->availableSocket(flags & GSM3MOBILECLIENTSERVICE_CLIENT,mySocket);
        if(flags & GSM3MOBILECLIENTSERVICE_SYNCH)
                res=waitForAnswer();

        return res;
}

int GSM3MobileClientService::read(uint8_t *buf, size_t size)
{
        int i;
        uint8_t c;
        
        for(i=0;i<size;i++)
        {
                c=read();
                if(c==0)
                        break;
                buf[i]=c;
        }
        
        return i;
/* This is the old implementation, testing a simpler one
        int res;
        // If we were writing, just stop doing it.
        if(flags & GSM3MOBILECLIENTSERVICE_WRITING)
                endWrite(true);
        res=theGSM3MobileClientProvider->readSocket(flags & GSM3MOBILECLIENTSERVICE_CLIENT, (char *)(buf), size, mySocket);

        return res;
*/
}

int GSM3MobileClientService::read()
{
        if(flags & GSM3MOBILECLIENTSERVICE_WRITING)
                endWrite(true);
        int c=theGSM3MobileClientProvider->readSocket();
        return c;
}

int GSM3MobileClientService::peek()
{
        if(flags & GSM3MOBILECLIENTSERVICE_WRITING)
                endWrite(true);
        return theGSM3MobileClientProvider->peekSocket(/*mySocket, false*/);
}

void GSM3MobileClientService::flush()
{
        if(flags & GSM3MOBILECLIENTSERVICE_WRITING)
                endWrite(true);
        theGSM3MobileClientProvider->flushSocket(/*mySocket*/);
        if(flags & GSM3MOBILECLIENTSERVICE_SYNCH)
                waitForAnswer();

}

void GSM3MobileClientService::stop()
{
        if(flags & GSM3MOBILECLIENTSERVICE_WRITING)
                endWrite(true);
        theGSM3MobileClientProvider->disconnectTCP(flags & GSM3MOBILECLIENTSERVICE_CLIENT, mySocket);
        theGSM3MobileClientProvider->releaseSocket(mySocket);
        mySocket = 0;
        if(flags & GSM3MOBILECLIENTSERVICE_SYNCH)
                waitForAnswer();
}