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en:arduino:libraries:ethernetudpremoteip

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en:arduino:libraries:ethernetudpremoteip [2016/12/25 22:15] (当前版本)
行 1: 行 1:
 +[[en:​arduino:​libraries:​ethernet|Ethernet]] : UDP.remoteIP()
 +====== UDP.remoteIP() ======
  
 +===== Description =====
 +
 +Gets the IP address of the remote connection.
 +
 +This function must be called after UDP.parsePacket().
 +===== Syntax =====
 +
 +UDP.remoteIP(); ​
 +===== Parameters =====
 +
 +None
 +===== Returns =====
 +
 +4 bytes : the IP address of the remote connection
 +===== Example =====
 +
 +<code cpp>
 +#include <​SPI.h> ​       ​
 +#include <​Ethernet.h>​
 +#include <​EthernetUdp.h>​
 +
 +// Enter a MAC address and IP address for your controller below.
 +// The IP address will be dependent on your local network:
 +byte mac[] = {  ​
 +  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
 +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(mac,​ip);​
 +  Udp.begin(localPort);​
 +}
 +
 +void loop() {
 +
 +  int packetSize = Udp.parsePacket();​
 +  if(packetSize)
 +  {
 +    Serial.print("​Received packet of size ");
 +    Serial.println(packetSize);​
 +    Serial.print("​From IP : ");
 +
 +    IPAddress remote = Udp.remoteIP();​
 +    //print out the remote connection'​s IP address
 +    Serial.print(remote);​
 +
 +    Serial.print("​ on port : ");
 +    //print out the remote connection'​s port
 +    Serial.println(Udp.remotePort());​
 +  }
 +
 +}
 +</​code>​
 +
 +[[en:​arduino:​libraries|Reference Home]]
en/arduino/libraries/ethernetudpremoteip.txt · 最后更改: 2016/12/25 22:15 (外部编辑)