Added a basic WiFi UDP client example (#114)
* Added a basic WiFi UDP client example: a sketch that sends random bytes over udp. * Updated udp example and included Python and Ruby UDP servers.
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libraries/WiFi/examples/WiFiUDPClient/WiFiUDPClient.ino
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libraries/WiFi/examples/WiFiUDPClient/WiFiUDPClient.ino
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/*
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* This sketch sends random data over UDP on a ESP32 device
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*
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*/
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#include <WiFi.h>
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#include <WiFiUdp.h>
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// WiFi network name and password:
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const char * networkName = "your-ssid";
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const char * networkPswd = "your-password";
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//IP address to send UDP data to:
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// either use the ip address of the server or
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// a network broadcast address
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const char * udpAddress = "192.168.0.255";
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const int udpPort = 3333;
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//Are we currently connected?
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boolean connected = false;
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//The udp library class
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WiFiUDP udp;
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void setup(){
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// Initilize hardware serial:
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Serial.begin(115200);
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//Connect to the WiFi network
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connectToWiFi(networkName, networkPswd);
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}
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void loop(){
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//only send data when connected
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if(connected){
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//Send a packet
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udp.beginPacket(udpAddress,udpPort);
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udp.printf("Seconds since boot: %u", millis()/1000);
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udp.endPacket();
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}
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//Wait for 1 second
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delay(1000);
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}
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void connectToWiFi(const char * ssid, const char * pwd){
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Serial.println("Connecting to WiFi network: " + String(ssid));
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// delete old config
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WiFi.disconnect(true);
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//register event handler
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WiFi.onEvent(WiFiEvent);
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//Initiate connection
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WiFi.begin(ssid, pwd);
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Serial.println("Waiting for WIFI connection...");
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}
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//wifi event handler
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void WiFiEvent(WiFiEvent_t event){
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switch(event) {
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case SYSTEM_EVENT_STA_GOT_IP:
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//When connected set
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Serial.print("WiFi connected! IP address: ");
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Serial.println(WiFi.localIP());
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//initializes the UDP state
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//This initializes the transfer buffer
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udp.begin(WiFi.localIP(),udpPort);
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connected = true;
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break;
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case SYSTEM_EVENT_STA_DISCONNECTED:
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Serial.println("WiFi lost connection");
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connected = false;
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break;
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}
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}
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libraries/WiFi/examples/WiFiUDPClient/udp_server.py
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libraries/WiFi/examples/WiFiUDPClient/udp_server.py
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# This python script listens on UDP port 3333
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# for messages from the ESP32 board and prints them
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import socket
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import sys
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try :
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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except socket.error, msg :
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print 'Failed to create socket. Error Code : ' + str(msg[0]) + ' Message ' + msg[1]
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sys.exit()
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try:
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s.bind(('', 3333))
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except socket.error , msg:
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print 'Bind failed. Error: ' + str(msg[0]) + ': ' + msg[1]
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sys.exit()
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print 'Server listening'
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while 1:
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d = s.recvfrom(1024)
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data = d[0]
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if not data:
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break
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print data.strip()
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s.close()
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libraries/WiFi/examples/WiFiUDPClient/udp_server.rb
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libraries/WiFi/examples/WiFiUDPClient/udp_server.rb
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# This ruby script listens on UDP port 3333
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# for messages from the ESP32 board and prints them
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require 'socket'
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include Socket::Constants
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udp_socket = UDPSocket.new(AF_INET)
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#bind
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udp_socket.bind("", 3333)
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puts 'Server listening'
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while true do
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message, sender = udp_socket.recvfrom(1024)
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puts message
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end
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