BLEtoUDP [Flashed into NodeMCU]

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//SENDER
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>

//UDP handle
WiFiUDP Udp;
unsigned int UDP_Port = 5000;
char* UDP_IP = "192.168.4.1"; //IP address of the RECEIVER
char PacketBuffer[1024]; //Buffer used for UDP data

//Wifi handle
const char* ssid = "YOUR_SSID";
const char* password = "YOUR_PASSWORD";
IPAddress ip(192, 168, 4, 2); //set a static IP for this device
IPAddress gateway(192, 168, 4, 1);
IPAddress subnet(255, 255, 255, 0);

bool flag = false; //to handle complete read of BLE data
int count = 0; //counter for checking correct length of received buffer from BLE, starts from 0 to 19

void setup() {
    memset(&PacketBuffer, (char)0, 1024); //set all buffer to 0
    pinMode(LED_BUILTIN, OUTPUT); //LOW = WiFi connected; HIGH = WiFi not connected
    digitalWrite(LED_BUILTIN, HIGH);
    Serial.begin(115200); //BLE serial
    WiFi.config(ip, gateway, subnet);
    WiFi.mode(WIFI_STA); //station mode
    WiFi.begin(ssid, password);
    Serial.println();
    Serial.print("Wait for WiFi");
    //wait for wireless connection
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    digitalWrite(LED_BUILTIN, LOW);
    Serial.println("");
    Serial.println("WiFi connected");
    Serial.println("IP address: " + WiFi.localIP().toString());
    Serial.println();
    Udp.begin(UDP_Port); //initialize UDP
}

void loop() {
    //if wireless connection drops, try to reconnect to it
    while (WiFi.status() != WL_CONNECTED) {
        digitalWrite(LED_BUILTIN, HIGH);
        delay(500);
        Serial.print(".");
    }

    digitalWrite(LED_BUILTIN, LOW);
    if (Serial.available()) {
        //read one char at the time and store it to che progressive 'count' position in the buffer array
        Serial.read(&PacketBuffer[count], 1);
        //checking for carriage return and line feed chars
        //replace carriage return (if for any reasons is present) with whitespace to avoid complications in the buffer processing by the receiver
        if (PacketBuffer[count] == '\r') PacketBuffer[count] = ' ';
        else if (PacketBuffer[count] == '\n') {
            //at this point the one buffer from BLE serial is completely processed
            PacketBuffer[count] = (char)0;
            count = 0; //reset counter
            flag = true; //complete data
        }
        else {
            //increment counter for next char read
            count++;
        }
    }

    if (flag) {
        //start send data from [1] and not [0] due to how data is sent by the T-skin.
        //the data in [0] is treated by a serial read as a terminator char (char)0.
        //if this data ends up in the buffer that we send the calid data after that char will be ignored
        //sending data from 2nd element is less time consuming that shifting all buffer
        //Serial.println(&PacketBuffer[1]); //for debug
        //here we send via UDP the data from BLE
        Udp.beginPacket(UDP_IP, UDP_Port);
        Udp.write(&PacketBuffer[1]);
        Udp.endPacket();
        flag = false; //reset flag for next buffer
        memset(PacketBuffer, (char)0, 1024); //set all buffer to 0
    }
}