Arduino reading Incomplete SMS Text from SIM900

hi,

i working on sms-based system. system includes sim900 gsm/gprs module arduino supposed read sms.

when used at+cmgr command terminal program manually read sms module, able read complete sms. please see attached image named: "using terminal". however, when try read sms arduino using sketch attached , got incomplete message. please see attached image named: "using arduino".

i have tried fix issue no avail. kindly help! attach arduino sketch assistance.

thank you.

hi

waiting 3 seconds until processing response may cause serial buffer full , rest of message may lost.

i suggest wait 3 seconds process response character character data available.

is helpfull:

code: [select]

boolean readgsmrxdataresponse(const string &p_resp, const int &p_max_response_seconds) {
  //many commands have standard 5 sec max response time, others twenty or sixty seconds
  //sending sms has max 60 second response time (it allows poor network connectivity/retries)

  //prior sending @ command cleared serial1 rx buffer.
  //so not expect extraneous response related previous long running command.

  //iterate response delay until have received first character of response
  unsigned long l_timer = millis();
  while (!checksecondsdelay(l_timer, p_max_response_seconds * 1000)) {
    if (serial1.available()) {
      break;
    }
  }
  //once response character received assume have whole response

  //readgsmrxdata includes 250ms delay between characters to
  //allow response still coming.
  readgsmrxdata();

  string l_resp = p_resp;
  l_resp.trim();
  if (g_gsmrxdata == "") {
    if (g_serialon)
      serial.println(f("no data received"));
    //
    checkfreesram();
    return false;
  }
  else if (l_resp == "") { //no particular response expected
    checkfreesram();
    return true; //the response can ignored
  }
  else if (g_gsmrxdata.indexof(l_resp) != -1) {
    //we may want trim expected response (ok) off g_gsmrxdata
    checkfreesram();
    return true;
  }

  //we may have expected ok got error.
  //or may have suffered comms error , recd garbage.
  if (g_serialon) {
    serial.print(f("response not found - "));
    serial.println(g_gsmrxdata);
  }
  checkfreesram();
  return false;
} //readgsmrxdataresponse

//----------------------------------------------------------------------------------------------

void readgsmrxdata() {
  //available data known in rx buffer
  //read , return via g_gsmrxdata
  //application wide place serial1.read()
  g_gsmrxdata = "";
  unsigned long l_timer = millis();
  while (!checksecondsdelay(l_timer, 250)) {
    while (serial1.available()) {
      char l_char; //always read char, append char g_gsmrxdata string
      l_char = serial1.read();
      g_gsmrxdata += l_char;
      l_timer = millis(); //reset qtr sec timer
    }
  }
  g_gsmrxdata.trim();
  //no need force uppercase
  checkfreesram();
} //readgsmrxdata

//----------------------------------------------------------------------------------------------


cheers

catweazle nz

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