File content as of revision 8:04b6a042595f:

/* USSDInterface.cpp */
/*
Copyright (C) 2012 ARM Limited.

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.
*/

#define __DEBUG__ 4
#ifndef __MODULE__
#define __MODULE__ "USSDInterface.cpp"
#endif

#include "core/fwk.h"

#include "USSDInterface.h"

#include <cstdio>

#define DEFAULT_TIMEOUT 10000
#define USSD_TIMEOUT 15000

USSDInterface::USSDInterface(ATCommandsInterface* pIf) : m_pIf(pIf), m_responseMtx(), m_responseSphre(1), m_result(NULL), m_maxResultLength(0)
{
  m_responseSphre.wait(0); //Take ownership of the semaphore
  m_pIf->registerEventsHandler(this); //Add us to the unsolicited result codes handlers
}

int USSDInterface::init()
{
  DBG("Initialization done");
  return OK;
}

int USSDInterface::send(const char* command, char* result, size_t maxLength)
{
  if (strlen(command) > 20) //Prevent buffer overflow
  {
    return NET_TOOSMALL;
  }

  m_responseMtx.lock();
  m_result = result;
  m_maxResultLength = maxLength;
  m_responseMtx.unlock();

  m_responseSphre.wait(0); //Make sure there is not a pending result that needs to be discarded

  DBG("Send USSD command & register for unsolicited result codes");
  //Send USSD command to the network
  char cmd[32];
  std::sprintf(cmd, "AT+CUSD=1,\"%s\"", command);
  int ret = m_pIf->executeSimple(cmd, NULL, DEFAULT_TIMEOUT);
  if( ret != OK )
  {
    return NET_PROTOCOL;
  }

  //Now wait for response
  int res = m_responseSphre.wait(USSD_TIMEOUT);

  //Reset data
  m_responseMtx.lock();
  m_result = NULL;
  m_maxResultLength = 0;
  m_responseMtx.unlock();

  if(res <= 0)
  {
    DBG("No result received");
    ret = m_pIf->executeSimple("AT+CUSD=2", NULL, DEFAULT_TIMEOUT); //Cancel command
    if( ret != OK )
    {
      return NET_PROTOCOL;
    }
    return NET_TIMEOUT;
  }

  DBG("Result received: %s", result);

  return OK;

}

/*virtual*/ bool USSDInterface::isATCodeHandled(const char* atCode) //Is this AT code handled
{
  DBG("AT code is %s", atCode);
  if( strcmp("+CUSD", atCode) == 0 )
  {
    return true;
  }

  DBG("Not handled");
  return false;
}

/*virtual*/ void USSDInterface::onDispatchStart()
{


}

/*virtual*/ void USSDInterface::onDispatchStop()
{

}

/*virtual*/ void USSDInterface::onEvent(const char* atCode, const char* evt)
{
  if( strcmp("+CUSD", atCode) != 0 )
  {
    return; //Not supported
  }

  char* pStart = (char*) strchr(evt,'\"');
  if(pStart==NULL)
  {
    return; //Invalid/incomplete response
  }
  pStart++; //Point to first char of response
  char* pEnd = (char*) strchr(pStart,'\"');
  if(pEnd==NULL)
  {
    return; //Invalid/incomplete response
  }
  m_responseMtx.lock();
  if(m_maxResultLength == 0) //No pending command
  {
    m_responseMtx.unlock();
    return;
  }
  size_t cpyLen = MIN( pEnd - pStart, m_maxResultLength - 1 );
  memcpy(m_result, pStart, cpyLen);
  m_result[cpyLen] = '\0';
  m_responseMtx.unlock();
  m_responseSphre.release(); //Signal user thread that response is ready
}