UDP ESP8266

gistfile1.txt

#include
#include

const char* ssid = "MySSID";
const char* password = "SecretPassword";

WiFiUDP Udp;
unsigned int localUdpPort = 4210;  // 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.mode(WIFI_STA);
  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);
}


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("192.168.41.255", localUdpPort+1);
    Udp.write(replyPacket);
    Udp.endPacket();

    String tmp = incomingPacket;
    if(tmp.indexOf("STATUS") >= 0)
        {
            // lets send back our IP address
            String temp = "ADDR:"+ WiFi.localIP().toString();

            temp.toCharArray(replyPacket,temp.length());
            Udp.beginPacket("255.255.255.255", localUdpPort+1);
            Udp.write(replyPacket);
            Udp.endPacket();
        }
       if(tmp.indexOf("RSSI") >= 0)
        {
            int mysignal = WiFi.RSSI(); // get the signal strength
           
            String temp = "RSSI:"+ String(mysignal);

            temp.toCharArray(replyPacket,temp.length());
            Udp.beginPacket("255.255.255.255", localUdpPort+1);
            Udp.write(replyPacket);
            Udp.endPacket();
        }
  }
}