flutter实现UDP发送魔法包唤醒主机

魔法包

魔法包是用16进制表示的数据包，它是由固定的前缀数据(FFFFFFFFFFFF)以及固定重复次数(16次)的目标主机MAC地址组成。
假设目标主机的MAC地址是："50:eb:f6:27:ae:a8"
那么魔法包就是[FFFFFFFFFFFF50EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA850EBF627AEA8]

实现代码

import 'dart:io';
void sendWOLPacket(String host, String mac) async {
// 将MAC地址转换为字节序列
List<int> macBytes = mac.split(':').map((s) => int.parse(s, radix: 16)).toList();
// 构造魔术包
List<int> packet = List.filled(6, 0xFF) + List<int>.generate(16 * macBytes.length, (index) => macBytes[index % macBytes.length]);
RawDatagramSocket? _socket;
try {
_socket = await RawDatagramSocket.bind(InternetAddress.anyIPv4, 0);
// 创建UDP Socket并发送魔术包
_socket.broadcastEnabled = true;
for (var i = 0; i < 5; i++) {
_socket.send(packet, InternetAddress(host), 0);
await Future.delayed(const Duration(milliseconds: 150));
_socket.send(packet, InternetAddress(host), 7);
await Future.delayed(const Duration(milliseconds: 150));
_socket.send(packet, InternetAddress(host), 9);
await Future.delayed(const Duration(milliseconds: 150));
}
print("success", "发送完成");
} catch (e) {
print("error", "出错了;$e");
}
_socket?.close();
}