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5dd780c571
do interleave informations on addresses within reception pbuf chain: before: (data-pbuf) -> (data-pbuf) -> (data-pbuf) -> ... in the receiving order now: (address+port-info-pbuf -> data-pbuf) -> (address_port-info-pbuf -> data-pbuf) -> ... address/port informations are updated along with data exposed to user
77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
/*
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UDPSendReceive.pde:
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This sketch receives UDP message strings, prints them to the serial port
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and sends an "acknowledge" string back to the sender
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A Processing sketch is included at the end of file that can be used to send
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and received messages for testing with a computer.
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created 21 Aug 2010
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by Michael Margolis
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This code is in the public domain.
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adapted from Ethernet library examples
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*/
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#include <ESP8266WiFi.h>
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#include <WiFiUdp.h>
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#ifndef STASSID
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#define STASSID "your-ssid"
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#define STAPSK "your-password"
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#endif
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unsigned int localPort = 8888; // local port to listen on
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// buffers for receiving and sending data
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char packetBuffer[UDP_TX_PACKET_MAX_SIZE + 1]; //buffer to hold incoming packet,
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char ReplyBuffer[] = "acknowledged\r\n"; // a string to send back
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WiFiUDP Udp;
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void setup() {
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Serial.begin(115200);
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WiFi.mode(WIFI_STA);
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WiFi.begin(STASSID, STAPSK);
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while (WiFi.status() != WL_CONNECTED) {
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Serial.print('.');
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delay(500);
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}
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Serial.print("Connected! IP address: ");
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Serial.println(WiFi.localIP());
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Serial.printf("UDP server on port %d\n", localPort);
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Udp.begin(localPort);
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}
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void loop() {
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// if there's data available, read a packet
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int packetSize = Udp.parsePacket();
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if (packetSize) {
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Serial.printf("Received packet of size %d from %s:%d\n (to %s:%d, free heap = %d B)\n",
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packetSize,
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Udp.remoteIP().toString().c_str(), Udp.remotePort(),
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Udp.destinationIP().toString().c_str(), Udp.localPort(),
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ESP.getFreeHeap());
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// read the packet into packetBufffer
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int n = Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
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packetBuffer[n] = 0;
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Serial.println("Contents:");
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Serial.println(packetBuffer);
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// send a reply, to the IP address and port that sent us the packet we received
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Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
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Udp.write(ReplyBuffer);
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Udp.endPacket();
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}
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}
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/*
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test (shell/netcat):
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--------------------
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nc -u 192.168.esp.address 8888
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*/
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