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en:arduino:libraries:ethernetudpwrite [2016/12/25 22:15] |
en:arduino:libraries:ethernetudpwrite [2016/12/25 22:15] (当前版本) |
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+ | [[en:arduino:libraries:ethernet|Ethernet]] : UDP.write() | ||
+ | ====== UDP.write() ====== | ||
+ | ===== Description ===== | ||
+ | |||
+ | Writes UDP data to the remote connection. Must be wrapped between beginPacket() and endPacket(). beginPacket() initializes the packet of data, it is not sent until endPacket() is called. | ||
+ | ===== Syntax ===== | ||
+ | |||
+ | UDP.write(message); | ||
+ | ===== Parameters ===== | ||
+ | |||
+ | message: the outgoing message (char) | ||
+ | ===== Returns ===== | ||
+ | |||
+ | byte : returns the number of characters sent. This does not have to be read | ||
+ | ===== 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() { | ||
+ | Udp.beginPacket(Udp.remoteIP(), Udp.remotePort()); | ||
+ | Udp.write("hello"); | ||
+ | Udp.endPacket(); | ||
+ | } | ||
+ | </code> | ||
+ | |||
+ | |||
+ | [[en:arduino:libraries|Reference Home]] |