UDP packet send from ESP8266 to KMtronic UDP LAN Relay board

 

 

 

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

const char *ssid = "KMTRONIC";
const char *password = "12345678";

WiFiUDP Udp;
unsigned int localUdpPort = 12345; // local port to listen on
char incomingPacket[255]; // buffer for incoming packets
char replyPacket[] = "Hi there! Got the message :-)"; // a reply string to send back


void setup()
{
 Serial.begin(115200);
 Serial.println();

Serial.printf("Connecting to %s ", ssid);
 WiFi.begin(ssid, password);
 while (WiFi.status() != WL_CONNECTED)
 {
 delay(500);
 Serial.print(".");
 }
 Serial.println(" connected");

Udp.begin(localUdpPort);
 Serial.printf("Now listening at IP %s, UDP port %d\n", WiFi.localIP().toString().c_str(), localUdpPort);
 
 // Turn relay 1 ON KMtronic UDP Relay board
 // connected to IP: 192.168.1.199 PORT:12345
 Udp.beginPacket("192.168.1.199", 12345);
 Serial.println("Send UDP...");
 Udp.write("FF0101");
 Serial.println(Udp.endPacket());
 // --------------------------------------
}


void loop()
{
 int packetSize = Udp.parsePacket();
 if (packetSize)
 {
 // receive incoming UDP packets
 Serial.printf("Received %d bytes from %s, port %d\n", packetSize, Udp.remoteIP().toString().c_str(), Udp.remotePort());
 int len = Udp.read(incomingPacket, 255);
 if (len > 0)
 {
 incomingPacket[len] = 0;
 }
 Serial.printf("UDP packet contents: %s\n", incomingPacket);

// send back a reply, to the IP address and port we got the packet from
 Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
 Udp.write(replyPacket);
 Udp.endPacket();
 }
}