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Page 3: Drone Control with JavaScript (Web UI & Node.js)

3. Drone Control with JavaScript (Web UI & Node.js)

Leverage Node.js to interact with drones and create intuitive web-based control interfaces. This allows remote control via a browser or even a mobile device.

3.1. Setting up Node.js for Drone Communication

You'll typically use a Node.js library that handles UDP communication, such as `node-tello`.

// Initialize your Node.js project
// npm init -y
// npm install node-tello

// server.js (Node.js backend)
const dgram = require('dgram');
const PORT = 8889; // Tello command port
const HOST = '192.168.10.1'; // Tello IP

const client = dgram.createSocket('udp4');
client.bind(8890); // Local port for Tello response

client.on('message', (msg, rinfo) => {
    console.log(\`Drone: \${msg.toString()}\`);
});

function sendTelloCommand(command) {
    console.log(\`Sending command: \${command}\`);
    client.send(command, 0, command.length, PORT, HOST, (err) => {
        if (err) throw err;
    });
}

// Example: Enter SDK mode
sendTelloCommand('command'); 

// ... later, integrate with a web server like Express

3.2. Creating a Basic Web Control Interface

A simple HTML page with JavaScript can send commands to your Node.js backend, which then relays them to the drone.

<!-- index.html -->
<button onclick="sendCommand('takeoff')">Take Off</button>
<button onclick="sendCommand('land')">Land</button>
<script>
    async function sendCommand(cmd) {
        // In a real app, this would be an AJAX call to your Node.js backend
        // For demonstration, imagine this calls a backend function.
        console.log(\`Simulating sending command to backend: \${cmd}\`);
        // Example with actual fetch to a simple Express server:
        // await fetch('/api/drone/command', { method: 'POST', body: JSON.stringify({ command: cmd }), headers: { 'Content-Type': 'application/json' } });
    }
</script>

This setup allows for more interactive and visually rich control experiences.

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