call.cpp

#include "call.h"

/**********************************************************
Method checks status of call

return:
      CALL_NONE         - no call activity
      CALL_INCOM_VOICE  - incoming voice
      CALL_ACTIVE_VOICE - active voice
      CALL_NO_RESPONSE  - no response to the AT command
      CALL_COMM_LINE_BUSY - comm line is not free
**********************************************************/
byte CallGSM::CallStatus(void)
{
     byte ret_val = CALL_NONE;

     if (CLS_FREE != gsm.GetCommLineStatus()) return (CALL_COMM_LINE_BUSY);
     gsm.SetCommLineStatus(CLS_ATCMD);
     gsm.SimpleWriteln(F("AT+CPAS"));

     // 5 sec. for initial comm tmout
     // 50 msec. for inter character timeout
     if (RX_TMOUT_ERR == gsm.WaitResp(5000, 50)) {
          // nothing was received (RX_TMOUT_ERR)
          // -----------------------------------
          ret_val = CALL_NO_RESPONSE;
     } else {
          // something was received but what was received?
          // ---------------------------------------------
          // ready (device allows commands from TA/TE)
          // <CR><LF>+CPAS: 0<CR><LF> <CR><LF>OK<CR><LF>
          // unavailable (device does not allow commands from TA/TE)
          // <CR><LF>+CPAS: 1<CR><LF> <CR><LF>OK<CR><LF>
          // unknown (device is not guaranteed to respond to instructions)
          // <CR><LF>+CPAS: 2<CR><LF> <CR><LF>OK<CR><LF> - NO CALL
          // ringing
          // <CR><LF>+CPAS: 3<CR><LF> <CR><LF>OK<CR><LF> - NO CALL
          // call in progress
          // <CR><LF>+CPAS: 4<CR><LF> <CR><LF>OK<CR><LF> - NO CALL
          if(gsm.IsStringReceived("+CPAS: 0")) {
               // ready - there is no call
               // ------------------------
               ret_val = CALL_NONE;
          } else if(gsm.IsStringReceived("+CPAS: 3")) {
               // incoming call
               // --------------
               ret_val = CALL_INCOM_VOICE;
          } else if(gsm.IsStringReceived("+CPAS: 4")) {
               // active call
               // -----------
               ret_val = CALL_ACTIVE_VOICE;
          }
     }

     gsm.SetCommLineStatus(CLS_FREE);
     return (ret_val);

}

/**********************************************************
Method checks status of call(incoming or active)
and makes authorization with specified SIM positions range

phone_number: a pointer where the tel. number string of current call will be placed
              so the space for the phone number string must be reserved - see example
first_authorized_pos: initial SIM phonebook position where the authorization process
                      starts
last_authorized_pos:  last SIM phonebook position where the authorization process
                      finishes

                      Note(important):
                      ================
                      In case first_authorized_pos=0 and also last_authorized_pos=0
                      the received incoming phone number is NOT authorized at all, so every
                      incoming is considered as authorized (CALL_INCOM_VOICE_NOT_AUTH is returned)

return:
      CALL_NONE                   - no call activity
      CALL_INCOM_VOICE_AUTH       - incoming voice - authorized
      CALL_INCOM_VOICE_NOT_AUTH   - incoming voice - not authorized
      CALL_ACTIVE_VOICE           - active voice
      CALL_INCOM_DATA_AUTH        - incoming data call - authorized
      CALL_INCOM_DATA_NOT_AUTH    - incoming data call - not authorized
      CALL_ACTIVE_DATA            - active data call
      CALL_NO_RESPONSE            - no response to the AT command
      CALL_COMM_LINE_BUSY         - comm line is not free
**********************************************************/
byte CallGSM::CallStatusWithAuth(char *phone_number,
                                 byte first_authorized_pos, byte last_authorized_pos)
{
     byte ret_val = CALL_NONE;
     byte search_phone_num = 0;
     byte i;
     byte status;
     char *p_char;
     char *p_char1;

     phone_number[0] = 0x00;  // no phonr number so far
     if (CLS_FREE != gsm.GetCommLineStatus()) return (CALL_COMM_LINE_BUSY);
     gsm.SetCommLineStatus(CLS_ATCMD);
     gsm.SimpleWriteln(F("AT+CLCC"));

     // 5 sec. for initial comm tmout
     // and max. 1500 msec. for inter character timeout
     gsm.RxInit(5000, 1500);
     // wait response is finished
     do {
          if (gsm.IsStringReceived("OK\r\n")) {
               // perfect - we have some response, but what:

               // there is either NO call:
               // <CR><LF>OK<CR><LF>

               // or there is at least 1 call
               // +CLCC: 1,1,4,0,0,"+420XXXXXXXXX",145<CR><LF>
               // <CR><LF>OK<CR><LF>
               status = RX_FINISHED;
               break; // so finish receiving immediately and let's go to
               // to check response
          }
          status = gsm.IsRxFinished();
     } while (status == RX_NOT_FINISHED);

     // generate tmout 30msec. before next AT command
     delay(30);

     if (status == RX_FINISHED) {
          // something was received but what was received?
          // example: //+CLCC: 1,1,4,0,0,"+420XXXXXXXXX",145
          // ---------------------------------------------
          if(gsm.IsStringReceived("+CLCC: 1,1,4,0,0")) {
               // incoming VOICE call - not authorized so far
               // -------------------------------------------
               search_phone_num = 1;
               ret_val = CALL_INCOM_VOICE_NOT_AUTH;
          } else if(gsm.IsStringReceived("+CLCC: 1,1,4,1,0")) {
               // incoming DATA call - not authorized so far
               // ------------------------------------------
               search_phone_num = 1;
               ret_val = CALL_INCOM_DATA_NOT_AUTH;
          } else if(gsm.IsStringReceived("+CLCC: 1,0,0,0,0")) {
               // active VOICE call - GSM is caller
               // ----------------------------------
               search_phone_num = 1;
               ret_val = CALL_ACTIVE_VOICE;
          } else if(gsm.IsStringReceived("+CLCC: 1,1,0,0,0")) {
               // active VOICE call - GSM is listener
               // -----------------------------------
               search_phone_num = 1;
               ret_val = CALL_ACTIVE_VOICE;
          } else if(gsm.IsStringReceived("+CLCC: 1,1,0,1,0")) {
               // active DATA call - GSM is listener
               // ----------------------------------
               search_phone_num = 1;
               ret_val = CALL_ACTIVE_DATA;
          } else if(gsm.IsStringReceived("+CLCC:")) {
               // other string is not important for us - e.g. GSM module activate call
               // etc.
               // IMPORTANT - each +CLCC:xx response has also at the end
               // string <CR><LF>OK<CR><LF>
               ret_val = CALL_OTHERS;
          } else if(gsm.IsStringReceived("OK")) {
               // only "OK" => there is NO call activity
               // --------------------------------------
               ret_val = CALL_NONE;
          }


          // now we will search phone num string
          if (search_phone_num) {
               // extract phone number string
               // ---------------------------
               p_char = strchr((char *)(gsm.comm_buf),'"');
               p_char1 = p_char+1; // we are on the first phone number character
               p_char = strchr((char *)(p_char1),'"');
               if (p_char != NULL) {
                    *p_char = 0; // end of string
                    strcpy(phone_number, (char *)(p_char1));
                    Serial.print("ATTESO: ");
                    Serial.println(phone_number);
               } else
                    //Serial.println(gsm.comm_buf);
                    Serial.println("NULL");

               if ( (ret_val == CALL_INCOM_VOICE_NOT_AUTH)
                         || (ret_val == CALL_INCOM_DATA_NOT_AUTH)) {

                    if ((first_authorized_pos == 0) && (last_authorized_pos == 0)) {
                         // authorization is not required => it means authorization is OK
                         // -------------------------------------------------------------
                         if (ret_val == CALL_INCOM_VOICE_NOT_AUTH) ret_val = CALL_INCOM_VOICE_AUTH;
                         else ret_val = CALL_INCOM_DATA_AUTH;
                    } else {
                         // make authorization
                         // ------------------
                         gsm.SetCommLineStatus(CLS_FREE);
                         for (i = first_authorized_pos; i <= last_authorized_pos; i++) {
                              if (gsm.ComparePhoneNumber(i, phone_number)) {
                                   // phone numbers are identical
                                   // authorization is OK
                                   // ---------------------------
                                   if (ret_val == CALL_INCOM_VOICE_NOT_AUTH) ret_val = CALL_INCOM_VOICE_AUTH;
                                   else ret_val = CALL_INCOM_DATA_AUTH;
                                   break;  // and finish authorization
                              }
                         }
                    }
               }
          }

     } else {
          // nothing was received (RX_TMOUT_ERR)
          // -----------------------------------
          ret_val = CALL_NO_RESPONSE;
     }

     gsm.SetCommLineStatus(CLS_FREE);
     return (ret_val);
}

/**********************************************************
Method picks up an incoming call

return:
**********************************************************/
void CallGSM::PickUp(void)
{
     //if (CLS_FREE != gsm.GetCommLineStatus()) return;
     //gsm.SetCommLineStatus(CLS_ATCMD);
     gsm.SendATCmdWaitResp("ATA", 10, 10, "OK", 3);
     gsm.SimpleWriteln("ATA");
     //gsm.SetCommLineStatus(CLS_FREE);
}

/**********************************************************
Method hangs up incoming or active call

return:
**********************************************************/
void CallGSM::HangUp(void)
{
     //if (CLS_FREE != gsm.GetCommLineStatus()) return;
     //gsm.SetCommLineStatus(CLS_ATCMD);
     gsm.SendATCmdWaitResp("ATH", 500, 100, "OK", 5);
     //gsm.SetCommLineStatus(CLS_FREE);
}

/**********************************************************
Method calls the specific number

number_string: pointer to the phone number string
               e.g. gsm.Call("+420123456789");

**********************************************************/
void CallGSM::Call(char *number_string)
{
     if (CLS_FREE != gsm.GetCommLineStatus()) return;
     gsm.SetCommLineStatus(CLS_ATCMD);
     // ATDxxxxxx;<CR>
     gsm.SimpleWrite(F("ATD"));
     gsm.SimpleWrite(number_string);
     gsm.SimpleWriteln(F(";"));
     // 10 sec. for initial comm tmout
     // 50 msec. for inter character timeout
     gsm.WaitResp(10000, 50);
     gsm.SetCommLineStatus(CLS_FREE);
}

/**********************************************************
Method calls the number stored at the specified SIM position

sim_position: position in the SIM <1...>
              e.g. gsm.Call(1);
**********************************************************/
void CallGSM::Call(int sim_position)
{
     if (CLS_FREE != gsm.GetCommLineStatus()) return;
     gsm.SetCommLineStatus(CLS_ATCMD);
     // ATD>"SM" 1;<CR>
     gsm.SimpleWrite(F("ATD>\"SM\" "));
     gsm.SimpleWrite(sim_position);
     gsm.SimpleWriteln(F(";"));

     // 10 sec. for initial comm tmout
     // 50 msec. for inter character timeout
     gsm.WaitResp(10000, 50);

     gsm.SetCommLineStatus(CLS_FREE);
}

void CallGSM::SendDTMF(char *number_string, int time)
{
     if (CLS_FREE != gsm.GetCommLineStatus()) return;
     gsm.SetCommLineStatus(CLS_ATCMD);

     gsm.SimpleWrite(F("AT+VTD="));
     gsm.SimpleWriteln(time);
     gsm.WaitResp(1000, 100, "OK");

     gsm.SimpleWrite(F("AT+VTS=\""));
     gsm.SimpleWrite(number_string);
     gsm.SimpleWriteln(F("\""));

     gsm.WaitResp(5000, 100, "OK");
     gsm.SetCommLineStatus(CLS_FREE);
}

void CallGSM::SetDTMF(int DTMF_status)
{
     if(DTMF_status==1)
          gsm.SendATCmdWaitResp("AT+DDET=1", 500, 50, "OK", 5);
     else
          gsm.SendATCmdWaitResp("AT+DDET=0", 500, 50, "OK", 5);
}


char CallGSM::DetDTMF()
{
     char *p_char;
     char *p_char1;
     char dtmf_char='-';
     gsm.WaitResp(1000, 500);
     {
          //Serial.print("BUF: ");
          //Serial.println((char *)gsm.comm_buf);
          //Serial.println("end");
          p_char = strstr((char *)(gsm.comm_buf),"+DTMF:");
          if (p_char != NULL) {
               p_char1 = p_char+6;  //we are on the first char of BCS
               dtmf_char = *p_char1;
          }
     }
     return dtmf_char;
}