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/* USSDInterface.cpp */
/* 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.
*/
#define __DEBUG__ 0
#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->execute(cmd, this, NULL, DEFAULT_TIMEOUT);
if( ret != OK )
{
return NET_PROTOCOL;
}
//Did we already get a response (3GPP rev < 6) ?
//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*/ int USSDInterface::onNewATResponseLine(ATCommandsInterface* pInst, const char* line)
{
const char* pSemicol = strchr(line, ':');
if( ( (pSemicol - line) != strlen("+CUSD") ) || ( memcmp(line, "+CUSD", strlen("+CUSD")) != 0) )
{
WARN("Unknown code");
return OK;
}
const char* pData = NULL;
if( pSemicol != NULL ) //Split the identifier & the result code (if it exists)
{
pData = pSemicol + 1;
if(pData[0]==' ')
{
pData++; //Suppress whitespace
}
processResult(pData);
}
return OK;
}
/*virtual*/ int USSDInterface::onNewEntryPrompt(ATCommandsInterface* pInst)
{
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*/ char* USSDInterface::getEventsEnableCommand()
{
return NULL; //No need to disable events here
}
/*virtual*/ char* USSDInterface::getEventsDisableCommand()
{
return NULL; //No need to re-enable events here
}
/*virtual*/ void USSDInterface::onEvent(const char* atCode, const char* evt)
{
if( strcmp("+CUSD", atCode) != 0 )
{
WARN("Wrong AT Code");
return; //Not supported
}
processResult(evt);
}
void USSDInterface::processResult(const char* data)
{
char* pStart = (char*) strchr(data,'\"');
if(pStart==NULL)
{
WARN("Could not find opening quote");
return; //Invalid/incomplete response
}
pStart++; //Point to first char of response
char* pEnd = (char*) strchr(pStart,'\"');
if(pEnd==NULL)
{
WARN("Could not find closing quote");
return; //Invalid/incomplete response
}
m_responseMtx.lock();
if(m_maxResultLength == 0) //No pending command
{
WARN("No pending command");
m_responseMtx.unlock();
return;
}
size_t cpyLen = MIN( pEnd - pStart, m_maxResultLength - 1 );
memcpy((void*)m_result, pStart, cpyLen);
m_result[cpyLen] = '\0';
DBG("Got USSD response: %s", m_result);
m_responseMtx.unlock();
m_responseSphre.release(); //Signal user thread that response is ready
}
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