I2C Problem, Communicating Between Two Arduinos

Using Arduino Networking, Protocols, and Devices
14

Hello,
I've the same problem with two arduinos communicating over i2c. I tried to use your solutions but I haven't got any progess with them. I am getting only the last byte and then only 255 too. Can you please help me with it?

Master code:

#include <Wire.h>
int wire_buffer[5]={-1,-1,-1,-1,-1};
void setup(){
  Wire.begin();
  Serial.begin(115200);
}
void loop(){
  uno_r(2);
  for(int i;i<5;i++){
  Serial.print(wire_buffer[i],DEC);
  Serial.print("    ");
  
  }
  Serial.println();
  delay(100);
}

 void uno_r(int howMany){
 Wire.requestFrom(2,howMany);
   for (int i = 0; i < kolik; i++) {
    if (Wire.available() > 0) {
      wire_buffer[i]=Wire.read();
    }
 } 
}

Slave code:

#include <Wire.h>
#include <Max3421e.h>
#include <Usb.h>
#include <AndroidAccessory.h>
 byte msg[2];
AndroidAccessory acc("Google, Inc.",
		     "DemoKit",
		     "DemoKit Arduino Board",
		     "1.0",
		     "http://www.android.com",
		     "0000000012345678");
void setup()
{
  Wire.begin(2);                // join i2c bus with address #2
  Wire.onRequest(requestEvent); // register event
  acc.powerOn();
  Serial.begin(115200);
}

void loop()
{
  	if (acc.isConnected()) {
                Serial.print("Accessory connected. ");
		int len = acc.read(msg, sizeof(msg), 1);
                Serial.print("Message value: ");
                Serial.print(msg[0],DEC);
                Serial.print("  ");
                Serial.println(msg[1],DEC);                       
        }
 delay(20);
}
void requestEvent()
{ 
  delay(10);
  char buff[2]={(byte)msg[0],(byte)msg[1]}; 
  Wire.write(buff);
 }

Thank you