send a binary message to a udp server in javascript

To send a binary message to a UDP server in JavaScript, you can use the built-in dgram module in Node.js. Here's an example:

index.tsx
const dgram = require('dgram');

// create a new UDP socket
const socket = dgram.createSocket('udp4');

// create a buffer containing your binary message
const message = Buffer.from([0x48, 0x65, 0x6c, 0x6c, 0x6f]);

// send the message to the UDP server
socket.send(message, 0, message.length, 1234, 'localhost', (err) => {
  if (err) {
    console.error(err);
    socket.close();
  } else {
    console.log('Message sent to server');
    socket.close();
  }
});
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In this example, Buffer.from() is used to create a buffer containing the binary message, which is then sent to the server using socket.send(). The send() method takes the buffer as its first argument, and the port number and IP address of the server as its second and third arguments.

Note that the example above is using the udp4 protocol, which is IPv4 UDP. You can use udp6 for IPv6 UDP if needed. Also, make sure to close the socket using socket.close() once the message has been sent.