Thanks again for your help.
Your suggestion was already implemented in my code (I'm not THAT noob )
here goes my code
#include <WiFi.h>
#include <WiFiUdp.h>
#include <SPI.h>
char ssid[] = "customNet";Â // SSID of your network
char pass[] = "customPassword"; // password of your Network
int status = WL_IDLE_STATUS;Â Â // the Wifi radio's status
IPAddress receiverIP(192, 168, 1, 212); // IP of udp packets receiver
unsigned int receiverPort = 9100;Â Â Â // port to listen on receiver machine
WiFiUDP Udp;
int firstSensorPin = A0; //define sensor pin
int secondSensorPin = A1;
int thirdSensorPin = A2;
int forthSensorPin = A3;
int firstSensorValue;
int secondSensorValue;
int thirdSensorValue;
int forthSensorValue;
void setup() {
 Serial.begin (9600);
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// attempt to connect to Wifi network:
 while ( status != WL_CONNECTED) {
  Serial.print("Attempting to connect to WPA SSID: ");
  Serial.println(ssid);
  status = WiFi.begin(ssid, pass);   // Connect to WPA/WPA2 network: Â
  delay(5000);   // wait 5 seconds for connection:
 }
 delay (2000);
 Serial.print("You're connected to the network");
 printCurrentNet();Â
 Udp.begin(receiverPort);
}
void loop() {
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 firstSensorValue = analogRead(firstSensorPin);
 secondSensorValue = analogRead (secondSensorPin);
 thirdSensorValue = analogRead (thirdSensorPin);
 forthSensorValue = analogRead (forthSensorPin);
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 byte valueInBytes[8] = {lowByte(firstSensorValue), highByte(firstSensorValue),
             lowByte(secondSensorValue), highByte(secondSensorValue),
             lowByte(thirdSensorValue), highByte(thirdSensorValue),
             lowByte(forthSensorValue), highByte(forthSensorValue)
            }; //convert it to byte array
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 Udp.beginPacket(receiverIP, receiverPort); //start udp packet
 Udp.write(valueInBytes, 8); //write sensor data to udp packet
 Udp.endPacket(); // end packet
 delay(10000);
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}
void printCurrentNet() {
 // print the SSID:
 Serial.print("SSID: ");
 Serial.println(WiFi.SSID());
 // print the MAC address of the router you're attached to:
 byte bssid[6];
 WiFi.BSSID(bssid); Â
 Serial.print("BSSID: ");
 Serial.print(bssid[5],HEX);
 Serial.print(":");
 Serial.print(bssid[4],HEX);
 Serial.print(":");
 Serial.print(bssid[3],HEX);
 Serial.print(":");
 Serial.print(bssid[2],HEX);
 Serial.print(":");
 Serial.print(bssid[1],HEX);
 Serial.print(":");
 Serial.println(bssid[0],HEX);
 // print the received signal strength:
 long rssi = WiFi.RSSI();
 Serial.print("signal strength (RSSI):");
 Serial.println(rssi);
 // print the encryption type:
 byte encryption = WiFi.encryptionType();
 Serial.print("Encryption Type:");
 Serial.println(encryption,HEX);
 Serial.println();
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 // print your WiFi shield's IP address:
 IPAddress ip = WiFi.localIP();
 Serial.print("IP Address: ");
 Serial.println(ip);
}