web controlled gpio pin of esp8266 using arduino uno

guys i interfaced esp 8266 with arduino uno…with the following code below…it get me the error like

“/usr/share/arduino/hardware/arduino/cores/arduino/Print.h:53:20: error: initializing argument 1 of ‘virtual size_t Print::write(const uint8_t*, size_t)’ [-fpermissive]
virtual size_t write(const uint8_t *buffer, size_t size);”

this bug is due to the “LAST CONTENT IS NOT SENT BACK” which is done by adding SPACE…

httpResponse =httpHeader + content + " "; // There is a bug in this code: the last character of “content” is not sent, I cheated by adding this extra space

now i changed it to httpResponse =httpHeader + content;
so i removed the space even though i getting the error…

i will post exact code which i used below…there is an error under
“void sendHTTPResponse(int connectionId, String content){}” thiz fuction i think …

#include <SoftwareSerial.h>

#define DEBUG true

SoftwareSerial esp8266(2,3); // make RX Arduino line is pin 2, make TX Arduino line is pin 3.
// This means that you need to connect the TX line from the esp to the Arduino’s pin 2
// and the RX line from the esp to the Arduino’s pin 3
void setup()
{
Serial.begin(9600);
esp8266.begin(9600); // your esp’s baud rate might be different

pinMode(11,OUTPUT);
digitalWrite(11,LOW);

pinMode(12,OUTPUT);
digitalWrite(12,LOW);

pinMode(13,OUTPUT);
digitalWrite(13,LOW);

pinMode(10,OUTPUT);
digitalWrite(10,LOW);

sendCommand(“AT+RST\r\n”,2000,DEBUG); // reset module
sendCommand(“AT+CWMODE=1\r\n”,1000,DEBUG); // configure as access point
sendCommand(“AT+CWJAP=“mySSID”,“myPassword”\r\n”,3000,DEBUG);
delay(10000);
sendCommand(“AT+CIFSR\r\n”,1000,DEBUG); // get ip address
sendCommand(“AT+CIPMUX=1\r\n”,1000,DEBUG); // configure for multiple connections
sendCommand(“AT+CIPSERVER=1,80\r\n”,1000,DEBUG); // turn on server on port 80

Serial.println(“Server Ready”);
}

void loop()
{
if(esp8266.available()) // check if the esp is sending a message
{

if(esp8266.find("+IPD,"))
{
delay(1000); // wait for the serial buffer to fill up (read all the serial data)
// get the connection id so that we can then disconnect
int connectionId = esp8266.read()-48; // subtract 48 because the read() function returns
// the ASCII decimal value and 0 (the first decimal number) starts at 48

esp8266.find(“pin=”); // advance cursor to “pin=”

int pinNumber = (esp8266.read()-48); // get first number i.e. if the pin 13 then the 1st number is 1
int secondNumber = (esp8266.read()-48);
if(secondNumber>=0 && secondNumber<=9)
{
pinNumber*=10;
pinNumber +=secondNumber; // get second number, i.e. if the pin number is 13 then the 2nd number is 3, then add to the first number
}

digitalWrite(pinNumber, !digitalRead(pinNumber)); // toggle pin

// build string that is send back to device that is requesting pin toggle
String content;
content = "Pin ";
content += pinNumber;
content += " is ";

if(digitalRead(pinNumber))
{
content += “ON”;
}
else
{
content += “OFF”;
}

sendHTTPResponse(connectionId,content);

// make close command
String closeCommand = “AT+CIPCLOSE=”;
closeCommand+=connectionId; // append connection id
closeCommand+="\r\n";

sendCommand(closeCommand,1000,DEBUG); // close connection
}
}
}

/*

  • Name: sendData
  • Description: Function used to send data to ESP8266.
  • Params: command - the data/command to send; timeout - the time to wait for a response; debug - print to Serial window?(true = yes, false = no)
  • Returns: The response from the esp8266 (if there is a reponse)
    */
    String sendData(String command, const int timeout, boolean debug)
    {
    String response = “”;

int dataSize = command.length();
char data[dataSize];
command.toCharArray(data,dataSize);

esp8266.write(data,dataSize); // send the read character to the esp8266
if(debug)
{
Serial.println("\r\n====== HTTP Response From Arduino ======");
Serial.write(data,dataSize);
Serial.println("\r\n========================================");
}

long int time = millis();

while( (time+timeout) > millis())
{
while(esp8266.available())
{

// The esp has data so display its output to the serial window
char c = esp8266.read(); // read the next character.
response+=c;
}
}

if(debug)
{
Serial.print(response);
}

return response;
}

/*

  • Name: sendHTTPResponse
  • Description: Function that sends HTTP 200, HTML UTF-8 response
    */
    void sendHTTPResponse(int connectionId, String content)
    {

// build HTTP response
String httpResponse;
String httpHeader;
// HTTP Header
httpHeader = “HTTP/1.1 200 OK\r\nContent-Type: text/html; charset=UTF-8\r\n”;
httpHeader += "Content-Length: ";
httpHeader += content.length();
httpHeader += “\r\n”;
httpHeader +=“Connection: close\r\n\r\n”;
httpResponse = httpHeader + content + " "; // There is a bug in this code: the last character of “content” is not sent, I cheated by adding this extra space
sendCIPData(connectionId,httpResponse);
}

/*

  • Name: sendCIPDATA
  • Description: sends a CIPSEND=, command

*/
void sendCIPData(int connectionId, String data)
{
String cipSend = “AT+CIPSEND=”;
cipSend += connectionId;
cipSend += “,”;
cipSend +=data.length();
cipSend +="\r\n";
sendCommand(cipSend,1000,DEBUG);
sendData(data,1000,DEBUG);
}

/*

  • Name: sendCommand
  • Description: Function used to send data to ESP8266.
  • Params: command - the data/command to send; timeout - the time to wait for a response; debug - print to Serial window?(true = yes, false = no)
  • Returns: The response from the esp8266 (if there is a reponse)
    */
    String sendCommand(String command, const int timeout, boolean debug)
    {
    String response = “”;

esp8266.print(command); // send the read character to the esp8266

long int time = millis();

while( (time+timeout) > millis())
{
while(esp8266.available())
{

// The esp has data so display its output to the serial window
char c = esp8266.read(); // read the next character.
response+=c;
}
}

if(debug)
{
Serial.print(response);
}

return response;
}