en:arduino:libraries:ethernetudpwrite
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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]] | ||
en/arduino/libraries/ethernetudpwrite.txt · 最后更改: 2016/12/25 22:15 (外部编辑)
