ESP32 UDP read data

Projects Programming
16

Thank you for that bit of magic code.
I don't fully understand it but I sort of get the gist of it, enough to play around and get it to do what I want.Thank you for your help with this.
Paul

#include "Arduino.h"
#include "AsyncUDP.h"
#include "WiFi.h"
#include <ESP32Tone.h>

const char * ssid = "Paul2";
const char * password = "abcdeabcde";
const int buzzer = 4;
const int GarR = 2;  // garage Red LED  (RGB LED's)
const int GarG = 5;  // garage Green LED
const int GatR = 18;  // Gate Red LED 
const int GatG = 19;  // Gate Green LED
AsyncUDP udp;
IPAddress local_IP(192, 168, 0, 32);
IPAddress gateway(192, 168, 0, 1);
IPAddress subnet(255, 255, 255, 0);
IPAddress primaryDNS(8, 8, 8, 8);   //optional
IPAddress secondaryDNS(8, 8, 4, 4); //optional

void processPacket(AsyncUDPPacket &packet);
bool comparePacketString(AsyncUDPPacket &packet, const char *str);
const uint16_t udpPort = 1234;

void setup() {
  
  pinMode(buzzer, OUTPUT);
  pinMode(GarR, OUTPUT);
  pinMode(GarG, OUTPUT);
  pinMode(GatR, OUTPUT);
  pinMode(GatG, OUTPUT); 
  Serial.begin(9600);
    WiFi.mode(WIFI_STA);
    WiFi.begin(ssid, password);
    if (!WiFi.config(local_IP, gateway, subnet, primaryDNS, secondaryDNS)) {
    Serial.println("STA Failed to configure");
    }
//        if(udp.listen(1234)) {
//        Serial.print("UDP Listening on IP: ");
//        Serial.println(WiFi.localIP());
//}


  if (udp.listen(udpPort)) {
       udp.onPacket(processPacket);
   } else {
      Serial.println("Failed to initiate UDP Packet Listening");
 }
}

void loop() {

}

void processPacket(AsyncUDPPacket &packet) {
    if (comparePacketString(packet, "GarageDetect")) {
      Serial.println("GarageDetect");
        digitalWrite(GarR,HIGH);
          delay(100);
          digitalWrite(GarR,LOW);
          tone(buzzer, 3000,  300);
  } else if (comparePacketString(packet, "GarageLive")) {
      Serial.println("GarageLive");
        digitalWrite(GarG,HIGH);
          delay(100);
          digitalWrite(GarG,LOW);
  }
    if (comparePacketString(packet, "GateDetect")) {
      Serial.println("GateDetect");
        digitalWrite(GatR,HIGH);
          delay(100);
          digitalWrite(GatR,LOW);
        tone(buzzer, 3000,  300);
  } else if (comparePacketString(packet, "GateLive")) {
      Serial.println("GateLive");
        digitalWrite(GatG,HIGH);
          delay(100);
          digitalWrite(GatG,LOW);
  }


}

bool comparePacketString(AsyncUDPPacket &packet, const char *str) {
  size_t len = strlen(str);
  if (packet.length() < len) {
    return false;
  }
  if (memcmp(str, packet.data(), len) == 0) {
    return true;
  }
  return false;
}

I am still puzzled how this all continues to work despite no code in the loop section.. but it works, thank you .