ESP8266 Community Forum

- Wed Jun 29, 2016 1:58 pm #49966 I'm sending HTTP POST request to ESP8266 and reading every parameter by using .find("IPD") etc... The problem is when I add more chars to my parameter after some amount I lose remaining data. I'm not sure what's wrong.

Code is below:

Code: Select all if (esp8266.available()) // check if the esp is sending a message
  {
    if (esp8266.find("+IPD,"))
    {
      delay(1000);
      int connectionId = esp8266.read() - 48;
      Serial.println(connectionId);
      String sip_keyword = "sid=";
      String ssid_keyword = "id=";
      String pw_keyword = "pw=";
      char* sip_buffer = (char*) malloc(sizeof(char) * sip_keyword.length() + 1);
      char* ssid_buffer = (char*) malloc(sizeof(char) * ssid_keyword.length() + 1);
      char* pw_buffer = (char*) malloc(sizeof(char) * pw_keyword.length() + 1);
      sip_keyword.toCharArray(sip_buffer, sip_keyword.length() + 1);
      ssid_keyword.toCharArray(ssid_buffer, ssid_keyword.length() + 1);
      pw_keyword.toCharArray(pw_buffer, pw_keyword.length() + 1);
      SERVER_IP = findDataFromESP8266(sip_buffer);
      WIFI_SSID = findDataFromESP8266(ssid_buffer);
      WIFI_PASSWORD = findDataFromESP8266(pw_buffer);
}
}
String findDataFromESP8266(char* keyword) {
  String data = "";
  int tempASCII = 0;
  char tempChar = 0;
  boolean check = (tempASCII != 38 && tempASCII != -1 && tempASCII != 32);
  //advance to find wanted keyword.
  if (esp8266.find(keyword) > -1) {
    tempASCII = esp8266.read();
    if (check) {
      while (check) {
        tempChar = tempASCII;
        data += tempChar;
        tempASCII = esp8266.read(); //iterate
        check = (tempASCII != 38 && tempASCII != -1 && tempASCII != 32);
      }
    } else {
      Serial.println(F("SSID empty"));
    }
    Serial.print(F("Data found with keyword "));
    Serial.print(keyword);
    Serial.print(F(": "));
    Serial.println(data);
    delay(200);
  }