Initial — Node.js IoT Dashboard with Chart.js

server.js

@@ -0,0 +1,65 @@
+const express = require("express");
+const { createClient } = require("redis");
+
+const PORT = process.env.PORT || 3000;
+const REDIS_HOST = process.env.REDIS_HOST || "127.0.0.1";
+const REDIS_PORT = parseInt(process.env.REDIS_PORT || "6379");
+const REDIS_PASSWORD = process.env.REDIS_PASSWORD || undefined;
+
+const app = express();
+app.use(express.static("public"));
+
+const redis = createClient({
+  socket: { host: REDIS_HOST, port: REDIS_PORT },
+  password: REDIS_PASSWORD,
+});
+
+redis.on("error", (err) => console.error("Redis error:", err.message));
+
+async function start() {
+  await redis.connect();
+  console.log("Redis connected");
+
+  // API: latest sensor values
+  app.get("/api/latest", async (req, res) => {
+    try {
+      const data = await redis.hGetAll("iot:latest");
+      const items = Object.entries(data).map(([id, json]) => ({
+        sensor_id: id,
+        ...JSON.parse(json),
+      }));
+      res.json(items);
+    } catch (e) {
+      res.json({ error: e.message });
+    }
+  });
+
+  // API: counters by device type
+  app.get("/api/counters", async (req, res) => {
+    try {
+      const data = await redis.hGetAll("iot:counters");
+      res.json(data);
+    } catch (e) {
+      res.json({ error: e.message });
+    }
+  });
+
+  // API: recent events
+  app.get("/api/recent", async (req, res) => {
+    try {
+      const items = await redis.zRange("iot:recent", 0, 49, { REV: true });
+      res.json(items.map(JSON.parse));
+    } catch (e) {
+      res.json({ error: e.message });
+    }
+  });
+
+  // Health check
+  app.get("/", (req, res) => {
+    res.send("IoT Dashboard OK");
+  });
+
+  app.listen(PORT, () => console.log(`Dashboard on port ${PORT}`));
+}
+
+start();