[Ethernet]
描述
Checks for the presence of a UDP packet, and reports the size. parsePacket() must be called before reading the buffer with Udp.read().
語法
// An EthernetUDP instance to let us send and receive packets over UDP EthernetUDP Udp; Udp.parsePacket();
參數
None
回傳
int: the size of a received UDP packet
範例
#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;
void setup() {
// start the Ethernet and UDP:
Ethernet.begin(NULL,ip);
Udp.begin(localPort);
Serial.begin(9600);
}
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);
}
delay(10);
}函式庫參考主頁面
86Duino 參考的文本是根據 知識共享署名-相同方式分享 3.0 許可證，部分文本是從 Arduino 參考 修改的。 參考中的代碼示例已發佈到公共領域。