[Ethernet]
説明
Reads UDP data from the specified buffer. If no arguments are given, it will return the next character in the buffer.
This function can only be successfully called after Udp.parsePacket().
Syntax
// An EthernetUDP instance to let us send and receive packets over UDP EthernetUDP Udp; Udp.read(); Udp.read(packetBuffer, MaxSize);
Parameters
packetBuffer
: buffer to hold incoming packets (char)MaxSize
: maximum size of the buffer (int)
Returns
char: returns the characters in the buffer
Example
#include <Ethernet.h> #include <EthernetUdp.h> // Enter an IP address for your controller below. // The IP address will be dependent on your local network: IPAddress ip(192, 168, 1, 177); unsigned int localPort = 8888; // local port to listen on // An EthernetUDP instance to let us send and receive packets over UDP EthernetUDP Udp; char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; //buffer to hold incoming packet, void setup() { // start the Ethernet and UDP: Ethernet.begin(NULL,ip); Udp.begin(localPort); } void loop() { 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); } }
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