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- /*
- UDPSendReceive.pde:
- This sketch receives UDP message strings, prints them to the serial port
- and sends an "acknowledge" string back to the sender
- A Processing sketch is included at the end of file that can be used to send
- and received messages for testing with a computer.
- created 21 Aug 2010
- by Michael Margolis
- This code is in the public domain.
- adapted from Ethernet library examples
- */
- #include <ESP8266WiFi.h>
- #include <WiFiUdp.h>
- #ifndef STASSID
- #define STASSID "wemos"
- #define STAPSK "nincs"
- #endif
- unsigned int localPort = 8888; // local port to listen on
- // buffers for receiving and sending data
- char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; //buffer to hold incoming packet,
- char ReplyBuffer[] = "acknowledged\r\n"; // a string to send back
- WiFiUDP Udp;
- void setup() {
- Serial.begin(115200);
- WiFi.mode(WIFI_STA);
- WiFi.begin(STASSID, STAPSK);
- Serial.println('Connecting');
- while (WiFi.status() != WL_CONNECTED) {
- Serial.print('.');
- delay(1000);
- }
- Serial.print("Connected! IP address: ");
- Serial.println(WiFi.localIP());
- Serial.printf("UDP server on port %d\n", localPort);
- Udp.begin(localPort);
- }
- void loop() {
- // if there's data available, read a packet
- int packetSize = Udp.parsePacket();
- if (packetSize) {
- Serial.print("Received packet of size ");
- Serial.println(packetSize);
- Serial.print("From ");
- IPAddress remote = Udp.remoteIP();
- for (int i = 0; i < 4; i++) {
- Serial.print(remote[i], DEC);
- if (i < 3) {
- Serial.print(".");
- }
- }
- Serial.print(", port ");
- Serial.println(Udp.remotePort());
- // read the packet into packetBufffer
- Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
- Serial.println("Contents:");
- Serial.println(packetBuffer);
- // send a reply, to the IP address and port that sent us the packet we received
- Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
- Udp.write(ReplyBuffer);
- Udp.endPacket();
- }
- delay(10);
- }
- /*
- test (shell/netcat):
- --------------------
- nc -u 192.168.esp.address 8888
- */
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