feat: add CORS support and enhance session routes for better sensor management

realtime/client-example.js

@@ -0,0 +1,78 @@
+const WebSocket = require('ws');
+const { encode } = require('@msgpack/msgpack');
+
+const SERVER_URL = process.env.SERVER_URL || 'http://localhost:3000';
+const WS_URL = process.env.WS_URL || 'ws://localhost:3000';
+const SENSOR_NAME = process.env.SENSOR_NAME || 'sensor-01';
+const SENSOR_CODE = process.env.SENSOR_CODE || 'password123';
+
+async function authenticate() {
+    const res = await fetch(`${SERVER_URL}/connect/`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ name: SENSOR_NAME, code: SENSOR_CODE }),
+    });
+
+    if (!res.ok) {
+        const err = await res.json();
+        throw new Error(`Auth failed: ${err.error}`);
+    }
+
+    const data = await res.json();
+    console.log('Authenticated, token received');
+    return data.t;
+}
+
+function connectWebSocket(token) {
+    const ws = new WebSocket(`${WS_URL}?token=${token}`);
+
+    ws.on('open', () => {
+        console.log('WebSocket connected');
+        startSendingData(ws);
+    });
+
+    ws.on('pong', () => {
+        // Keepalive pong received
+    });
+
+    ws.on('close', (code, reason) => {
+        console.log(`WebSocket closed: ${code} ${reason}`);
+        process.exit(1);
+    });
+
+    ws.on('error', (err) => {
+        console.error('WebSocket error:', err.message);
+    });
+}
+
+function startSendingData(ws) {
+    setInterval(() => {
+        if (ws.readyState !== WebSocket.OPEN) return;
+
+        const packet = {
+            ts: Date.now(),
+            t: 20 + Math.random() * 10,        // temperature °C
+            h: 50 + Math.random() * 30,         // humidity %
+            spd: Math.random() * 30,             // speed
+            cog: Math.random() * 360,            // course over ground
+            sog: 5 + Math.random() * 10,         // speed over ground kn
+            hdg: Math.random() * 360,            // heading true
+            lat: 43.7230 + Math.random() * 0.01, // latitude
+            lon: 10.3966 + Math.random() * 0.01, // longitude
+        };
+
+        ws.send(Buffer.from(encode(packet)));
+    }, 1000);
+}
+
+async function main() {
+    try {
+        const token = await authenticate();
+        connectWebSocket(token);
+    } catch (err) {
+        console.error(err.message);
+        process.exit(1);
+    }
+}
+
+main();