Starbeamrainbowlabs 5 years ago
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  1. 106
      UdpExample/UdpExample.ino

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UdpExample/UdpExample.ino

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/*
* 31 mar 2015
* This sketch display UDP packets coming from an UDP client.
* On a Mac the NC command can be used to send UDP. (nc -u 192.168.1.101 2390).
*
* Configuration : Enter the ssid and password of your Wifi AP. Enter the port number your server is listening on.
*
13 apr 2015. Partly working. Packets are received and displayed, but the confirmation packet is not received by the client.
Tested with Mac as client using netcat (nc -u 192.168.1.101 2390)
*/
#include <ESP8266WiFi.h>
#include <WiFiUDP.h>
int status = WL_IDLE_STATUS;
const char* ssid = "yourssid"; // your network SSID (name)
const char* pass = "yourpassword"; // your network password
unsigned int localPort = 2390; // local port to listen for UDP packets
byte packetBuffer[512]; //buffer to hold incoming and outgoing packets
// A UDP instance to let us send and receive packets over UDP
WiFiUDP Udp;
// Multicast declarations
IPAddress ipMulti(239, 0, 0, 57);
unsigned int portMulti = 12345; // local port to listen on
void setup()
{
// Open serial communications and wait for port to open:
Serial.begin(115200);
// setting up Station AP
WiFi.begin(ssid, pass);
// Wait for connect to AP
Serial.print("[Connecting]");
Serial.print(ssid);
int tries=0;
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
tries++;
if (tries > 30){
break;
}
}
Serial.println();
printWifiStatus();
Serial.println("Connected to wifi");
Serial.print("Udp Multicast server started at : ");
Serial.print(ipMulti);
Serial.print(":");
Serial.println(portMulti);
Udp.beginMulticast(WiFi.localIP(), ipMulti, portMulti);
}
void loop()
{
int noBytes = Udp.parsePacket();
if ( noBytes ) {
Serial.print(millis() / 1000);
Serial.print(":Packet of ");
Serial.print(noBytes);
Serial.print(" received from ");
Serial.print(Udp.remoteIP());
Serial.print(":");
Serial.println(Udp.remotePort());
// We've received a packet, read the data from it
Udp.read(packetBuffer,noBytes); // read the packet into the buffer
// display the packet contents in HEX
for (int i=1;i<=noBytes;i++){
Serial.print(packetBuffer[i-1],HEX);
if (i % 32 == 0){
Serial.println();
}
else Serial.print(' ');
} // end for
Serial.println();
// send a reply, to the IP address and port that sent us the packet we received
Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
Udp.write("UDP packet received");
Udp.endPacket();
} // end if
}
void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
}
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