Como abrir uma conexão TCP em JavaScript
//
// This example shows a simple TCP echo server.
// The server will listen on port 6789 and respond back with whatever
// has been sent to the server.
//
// Request permission to listen on port 6789
navigator.tcpServerPermission.requestPermission({"localPort":6789}).then(
() => {
// Permission was granted
// Create a new server socket that listens on port 6789
var myServerSocket = new TCPServerSocket({"localPort": 6789});
// Listen for connection attempts from TCP clients.
listenForConnections();
function listenForConnections() {
myServerSocket.listen().then(
connectedSocket => {
// A connection has been accepted
console.log ("Connection accepted from address: " +
connectedSocket.remoteAddress + " port: " +
connectedSocket.remotePort);
var reader = connectedSocket.readable.getReader();
// Wait for data
waitForData();
function waitForData () {
reader.read().then(
({ value, done }) => {
if (done) return;
// Data in buffer, read it
console.log("Received: " + value);
// Send data back
connected.writeable.write(value).then(
() => console.log("Sending data succeeded"),
e => console.error("Failed to send: ", e);
});
// Continue to wait for data
waitForData ();
}
);
}
// Continue to listen for new connections
listenForConnections();
},
e => {
console.error("A client connection attempt failed: ", e);
// Continue to listen for new connections
listenForConnections();
}
);
}
// Log result of TCP server socket creation attempt.
myServerSocket.opened.then(
() => {
console.log("TCP server socket created sucessfully");
},
e =>console.error("TCP server socket creation failed due to error: ", e);
);
// Handle TCP server closed, either as a result of the webapp
// calling myServerSocket.close() or due to an error.
myServerSocket.closed.then(
() => {
console.log("TCP server socket has been cleanly closed");
},
e => console.error("TCP server socket closed due to error: ", e);
);
},
e => console.error("TCP Server Socket on local port 6789 was denied
due to error: ", e);
);
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