Diff: ussd/USSDInterface.cpp

Revision:

1:4a23efdf0da9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ussd/USSDInterface.cpp	Thu Oct 17 12:29:05 2013 +0300
@@ -0,0 +1,196 @@
+/* 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
+}