diff --git a/src/lib/server/mqtt-devices.js b/src/lib/server/mqtt-devices.js
new file mode 100644
index 0000000..8445506
--- /dev/null
+++ b/src/lib/server/mqtt-devices.js
@@ -0,0 +1,42 @@
+// src/lib/server/mqtt-devices.js
+// This module provides access to MQTT device data for other parts of the application
+
+// We'll import the maps directly from the MQTT server module
+
+let connectedDevices = new Map();
+let deviceSensorData = new Map();
+
+// Export the maps so the MQTT server can set them
+export { connectedDevices, deviceSensorData };
+
+// Clean up offline devices (not seen in last 5 minutes)
+function cleanupDevices() {
+  const fiveMinutesAgo = new Date(Date.now() - 5 * 60 * 1000);
+  let updated = false;
+
+  for (const [deviceId, device] of connectedDevices.entries()) {
+    if (device.lastSeen < fiveMinutesAgo && device.status === "online") {
+      connectedDevices.set(deviceId, { ...device, status: "offline" });
+      updated = true;
+    }
+  }
+
+  return updated;
+}
+
+// Export function to get current devices
+export function getCurrentDevices() {
+  cleanupDevices();
+  return Array.from(connectedDevices.values()).map((device) => {
+    const sensorData = deviceSensorData.get(device.id);
+    return {
+      ...device,
+      sensorData: sensorData || null,
+    };
+  });
+}
+
+// Export function to get sensor data for a specific device
+export function getDeviceSensorData(deviceId) {
+  return deviceSensorData.get(deviceId) || null;
+}
diff --git a/src/routes/(app)/[slug]/+page.server.ts b/src/routes/(app)/[slug]/+page.server.ts
index 68d7496..8ce7412 100644
--- a/src/routes/(app)/[slug]/+page.server.ts
+++ b/src/routes/(app)/[slug]/+page.server.ts
@@ -3,6 +3,7 @@ import * as table from "$lib/server/db/schema";
 import { eq } from "drizzle-orm";
 import type { PageServerLoad } from "./$types";
 import { connect } from "mqtt";
+import { getDeviceSensorData } from "$lib/server/mqtt-devices.js";
 
 export const load: PageServerLoad = async ({ params }) => {
   // Convert slug to number for floor lookup
@@ -18,6 +19,18 @@ export const load: PageServerLoad = async ({ params }) => {
     try {
       // Try to parse the saved configuration
       const config = JSON.parse(floorData[0].url);
+      
+      // Add real sensor data to devices
+      if (config.devices) {
+        config.devices = config.devices.map(device => {
+          const sensorData = getDeviceSensorData(device.id);
+          return {
+            ...device,
+            sensorData: sensorData
+          };
+        });
+      }
+      
       return { 
         slug: params.slug, 
         floorConfig: config,
diff --git a/src/routes/(app)/[slug]/+page.svelte b/src/routes/(app)/[slug]/+page.svelte
index 27ee060..3aa8411 100644
--- a/src/routes/(app)/[slug]/+page.svelte
+++ b/src/routes/(app)/[slug]/+page.svelte
@@ -6,22 +6,50 @@
 
   let mqttMessage = $state("Waiting for MQTT message...");
   let eventSource;
+  let deviceSensorData = $state(new Map());
+  let refreshInterval;
 
   onMount(() => {
     // Connect to the SSE endpoint
+    console.log("Attempting to connect to MQTT SSE...");
     eventSource = new EventSource("/mqtt");
 
     eventSource.onopen = () => {
-      console.log("SSE connection opened.");
+      console.log("SSE connection opened successfully!");
     };
 
     eventSource.onmessage = (event) => {
+      if (eventSource.readyState !== EventSource.OPEN) {
+        console.log("Floor page: Received message but connection is not open, ignoring");
+        return;
+      }
+
       try {
-        const data = JSON.parse(event.data);
-        mqttMessage = data.message;
-        console.log("Received SSE message:", mqttMessage);
+        const messageData = JSON.parse(event.data);
+        console.log("Floor page received SSE data:", messageData);
+
+        // Handle device updates
+        if (messageData.devices) {
+          console.log("Received devices:", messageData.devices);
+          const newData = new Map();
+          messageData.devices.forEach((device) => {
+            console.log(`Device ${device.id} has sensor data:`, device.sensorData);
+            if (device.sensorData) {
+              newData.set(device.id, device.sensorData);
+            }
+          });
+          deviceSensorData = newData;
+          console.log("Updated deviceSensorData:", deviceSensorData);
+        }
+
+        // Handle MQTT message if present
+        if (messageData.message) {
+          mqttMessage = messageData.message;
+        } else {
+          mqttMessage = `Last update: ${messageData.timestamp}`;
+        }
       } catch (e) {
-        console.error("Error parsing SSE message:", e);
+        console.error("Floor page: Error parsing SSE message:", e, "Raw data:", event.data);
       }
     };
 
@@ -32,9 +60,12 @@
   });
 
   onDestroy(() => {
-    if (eventSource) {
-      console.log("Closing SSE connection.");
-      eventSource.close(); // Clean up the connection when the component is destroyed
+    if (eventSource && eventSource.readyState !== EventSource.CLOSED) {
+      console.log("Floor page: Closing SSE connection");
+      eventSource.close();
+    }
+    if (refreshInterval) {
+      clearInterval(refreshInterval);
     }
   });
 
@@ -114,19 +145,51 @@
                 <div class="mt-2 grid grid-cols-2 gap-1">
                   <div class="flex items-center gap-1">
                     <Thermometer class="h-3 w-3 text-orange-500" />
-                    <span class="text-xs">23°C</span>
+                    <span class="text-xs">
+                      {#if deviceSensorData.get(device.id)?.temperature !== undefined}
+                        {deviceSensorData.get(device.id).temperature.toFixed(1)}°C
+                      {:else if device.sensorData}
+                        {device.sensorData.temperature.toFixed(1)}°C
+                      {:else}
+                        --°C
+                      {/if}
+                    </span>
                   </div>
                   <div class="flex items-center gap-1">
                     <Droplets class="h-3 w-3 text-blue-500" />
-                    <span class="text-xs">45%</span>
+                    <span class="text-xs">
+                      {#if deviceSensorData.get(device.id)?.humidity !== undefined}
+                        {deviceSensorData.get(device.id).humidity.toFixed(1)}%
+                      {:else if device.sensorData}
+                        {device.sensorData.humidity.toFixed(1)}%
+                      {:else}
+                        --%
+                      {/if}
+                    </span>
                   </div>
                   <div class="flex items-center gap-1">
                     <Gauge class="h-3 w-3 text-green-500" />
-                    <span class="text-xs">1013</span>
+                    <span class="text-xs">
+                      {#if deviceSensorData.get(device.id)?.pressure !== undefined}
+                        {Math.round(deviceSensorData.get(device.id).pressure)}Pa
+                      {:else if device.sensorData}
+                        {Math.round(device.sensorData.pressure)}Pa
+                      {:else}
+                        --Pa
+                      {/if}
+                    </span>
                   </div>
                   <div class="flex items-center gap-1">
                     <Mountain class="h-3 w-3 text-purple-500" />
-                    <span class="text-xs">120m</span>
+                    <span class="text-xs">
+                      {#if deviceSensorData.get(device.id)?.altitude !== undefined}
+                        {deviceSensorData.get(device.id).altitude.toFixed(1)}m
+                      {:else if device.sensorData}
+                        {device.sensorData.altitude.toFixed(1)}m
+                      {:else}
+                        --m
+                      {/if}
+                    </span>
                   </div>
                 </div>
               </div>
diff --git a/src/routes/(app)/settings/+page.server.js b/src/routes/(app)/settings/+page.server.js
index f65e398..e7bdcb0 100644
--- a/src/routes/(app)/settings/+page.server.js
+++ b/src/routes/(app)/settings/+page.server.js
@@ -1,5 +1,6 @@
 import { db } from "$lib/server/db";
 import * as table from "$lib/server/db/schema";
+import { getCurrentDevices } from "$lib/server/mqtt-devices.js";
 import { fail } from "@sveltejs/kit";
 import { eq } from "drizzle-orm";
 
@@ -10,13 +11,20 @@ export const load = async (event) => {
     .from(table.floors)
     .orderBy(table.floors.floor);
 
-  // Provide mock ESP8266 devices for now
-  const devices = [
-    { id: "esp8266-001", name: "ESP8266 #001", type: "esp8266", status: "online" },
-    { id: "esp8266-002", name: "ESP8266 #002", type: "esp8266", status: "online" },
-    { id: "esp8266-003", name: "ESP8266 #003", type: "esp8266", status: "offline" },
-    { id: "esp8266-004", name: "ESP8266 #004", type: "esp8266", status: "online" },
-  ];
+  // Get real connected devices from MQTT
+  let devices = getCurrentDevices();
+
+  // If no real devices, provide fallback mock devices
+  if (devices.length === 0) {
+    devices = [
+      {
+        id: "no-devices",
+        name: "No ESP8266 devices connected",
+        type: "esp8266",
+        status: "offline",
+      },
+    ];
+  }
 
   return {
     floors: floors.map((f) => f.floor),
diff --git a/src/routes/(app)/settings/+page.svelte b/src/routes/(app)/settings/+page.svelte
index d8a8fb6..9b57069 100644
--- a/src/routes/(app)/settings/+page.svelte
+++ b/src/routes/(app)/settings/+page.svelte
@@ -1,5 +1,6 @@
 <script>
   import { enhance } from "$app/forms";
+  import { onMount, onDestroy } from "svelte";
   import Button from "$lib/components/ui/button/button.svelte";
   import Input from "$lib/components/ui/input/input.svelte";
   import Label from "$lib/components/ui/label/label.svelte";
@@ -14,6 +15,8 @@
 
   let floorPlanImage = $state(null);
   let availableDevices = $state(data.devices || []);
+  let deviceSensorData = $state(new Map());
+  let eventSource;
 
   let placedDevices = $state([]);
   let draggedDevice = $state(null);
@@ -34,6 +37,58 @@
     }
   });
 
+  // Set up real-time updates via SSE
+  onMount(() => {
+    console.log("Settings: Attempting to connect to MQTT SSE...");
+    eventSource = new EventSource("/mqtt");
+
+    eventSource.onopen = () => {
+      console.log("Settings: SSE connection opened successfully!");
+    };
+
+    eventSource.onmessage = (event) => {
+      if (eventSource.readyState !== EventSource.OPEN) {
+        console.log("Settings: Received message but connection is not open, ignoring");
+        return;
+      }
+
+      try {
+        const messageData = JSON.parse(event.data);
+        console.log("Settings page received SSE data:", messageData);
+
+        // Update device sensor data and device list from real-time updates
+        if (messageData.devices) {
+          console.log("Updating available devices with:", messageData.devices);
+          // Update available devices with latest data
+          availableDevices = messageData.devices;
+
+          // Update sensor data map
+          const newData = new Map();
+          messageData.devices.forEach((device) => {
+            if (device.sensorData) {
+              newData.set(device.id, device.sensorData);
+            }
+          });
+          deviceSensorData = newData;
+          console.log("Updated deviceSensorData:", deviceSensorData);
+        }
+      } catch (e) {
+        console.error("Settings: Error parsing SSE message:", e);
+      }
+    };
+
+    eventSource.onerror = (error) => {
+      console.error("SSE Error:", error);
+    };
+  });
+
+  onDestroy(() => {
+    if (eventSource && eventSource.readyState !== EventSource.CLOSED) {
+      console.log("Settings: Closing SSE connection");
+      eventSource.close();
+    }
+  });
+
   function handleFileUpload(event) {
     const file = event.target.files?.[0];
     if (file && file.type.startsWith("image/")) {
@@ -269,19 +324,43 @@
                 <div class="grid grid-cols-2 gap-1">
                   <div class="flex items-center gap-1 text-xs">
                     <Thermometer class="h-3 w-3 text-orange-500" />
-                    <span>Temperature</span>
+                    <span>
+                      {#if device.sensorData}
+                        {device.sensorData.temperature.toFixed(1)}°C
+                      {:else}
+                        --°C
+                      {/if}
+                    </span>
                   </div>
                   <div class="flex items-center gap-1 text-xs">
                     <Droplets class="h-3 w-3 text-blue-500" />
-                    <span>Humidity</span>
+                    <span>
+                      {#if device.sensorData}
+                        {device.sensorData.humidity.toFixed(1)}%
+                      {:else}
+                        --%
+                      {/if}
+                    </span>
                   </div>
                   <div class="flex items-center gap-1 text-xs">
                     <Gauge class="h-3 w-3 text-green-500" />
-                    <span>Pressure</span>
+                    <span>
+                      {#if device.sensorData}
+                        {Math.round(device.sensorData.pressure)}Pa
+                      {:else}
+                        --Pa
+                      {/if}
+                    </span>
                   </div>
                   <div class="flex items-center gap-1 text-xs">
                     <Mountain class="h-3 w-3 text-purple-500" />
-                    <span>Altitude</span>
+                    <span>
+                      {#if device.sensorData}
+                        {device.sensorData.altitude.toFixed(1)}m
+                      {:else}
+                        --m
+                      {/if}
+                    </span>
                   </div>
                 </div>
               </div>
diff --git a/src/routes/mqtt/+server.js b/src/routes/mqtt/+server.js
index 984b83f..d705f2a 100644
--- a/src/routes/mqtt/+server.js
+++ b/src/routes/mqtt/+server.js
@@ -1,4 +1,5 @@
 // src/routes/mqtt/+server.js
+import { connectedDevices, deviceSensorData, getCurrentDevices } from "$lib/server/mqtt-devices.js";
 import * as mqtt from "mqtt";
 import { writable } from "svelte/store";
 
@@ -10,6 +11,85 @@ const devices = writable([]);
 
 let client = null;
 
+// Function to update device status and sensor data
+function updateDevice(deviceId, sensorData = null) {
+  const now = new Date();
+  const deviceName = `ESP8266 #${deviceId.slice(-6)}`;
+
+  // Update device info
+  connectedDevices.set(deviceId, {
+    id: deviceId,
+    name: deviceName,
+    type: "esp8266",
+    status: "online",
+    lastSeen: now,
+  });
+
+  // Update sensor data if provided
+  if (sensorData) {
+    deviceSensorData.set(deviceId, {
+      ...sensorData,
+      timestamp: now,
+    });
+  }
+
+  // Update the devices store
+  updateDevicesStore();
+}
+
+// Function to parse sensor data from MQTT payload
+function parseSensorData(payload) {
+  try {
+    const data = JSON.parse(payload);
+    return {
+      temperature: parseFloat(data.temperature) || 0,
+      humidity: parseFloat(data.humidity?.replace("%", "")) || 0,
+      pressure: parseFloat(data.pressure) || 0,
+      altitude: parseFloat(data.altitude) || 0,
+    };
+  } catch (error) {
+    console.error("Error parsing sensor data:", error);
+    return null;
+  }
+}
+
+// Store SSE controllers for cleanup
+const sseControllers = new Set();
+
+// Function to update devices store with latest data
+function updateDevicesStore() {
+  const deviceList = Array.from(connectedDevices.values()).map((device) => {
+    const sensorData = deviceSensorData.get(device.id);
+    return {
+      ...device,
+      sensorData: sensorData || null,
+    };
+  });
+  devices.set(deviceList);
+}
+
+// Clean up offline devices (not seen in last 5 minutes)
+function cleanupDevices() {
+  const fiveMinutesAgo = new Date(Date.now() - 5 * 60 * 1000);
+  let updated = false;
+
+  for (const [deviceId, device] of connectedDevices.entries()) {
+    if (device.lastSeen < fiveMinutesAgo && device.status === "online") {
+      connectedDevices.set(deviceId, { ...device, status: "offline" });
+      updated = true;
+    }
+  }
+
+  if (updated) {
+    updateDevicesStore();
+  }
+}
+
+// Run cleanup every minute
+setInterval(cleanupDevices, 60000);
+
+// getCurrentDevices is now imported from the shared module
+
 // Function to connect to MQTT
 function connectMqtt() {
   if (client && client.connected) {
@@ -38,7 +118,23 @@ function connectMqtt() {
     const payload = message.toString();
     console.log(`Received message from topic "${topic}": ${payload}`);
     latestMessage.set(payload); // Update the Svelte store
-    console.log(topic.split("/")[1]);
+
+    // Extract device ID from topic (esp8266/DEVICE_ID/data)
+    const topicParts = topic.split("/");
+    if (topicParts.length >= 3 && topicParts[0] === "esp8266" && topicParts[2] === "data") {
+      const deviceId = topicParts[1];
+      console.log(`Processing data for device: ${deviceId}`);
+
+      // Parse sensor data
+      const sensorData = parseSensorData(payload);
+      if (sensorData) {
+        console.log(`Parsed sensor data:`, sensorData);
+        updateDevice(deviceId, sensorData);
+      } else {
+        // Still update device as online even if data parsing failed
+        updateDevice(deviceId);
+      }
+    }
   });
 
   client.on("error", (err) => {
@@ -71,24 +167,98 @@ export async function GET({ request }) {
   return new Response(
     new ReadableStream({
       start(controller) {
-        console.log("Client connected to SSE stream.");
+        console.log("Client connected to MQTT SSE stream");
 
+        let isConnected = true;
+        let interval;
+
+        // Add this controller to the broadcast set
+        sseControllers.add(controller);
+
+        // Cleanup function
+        const cleanup = () => {
+          console.log("Cleaning up MQTT SSE connection");
+          isConnected = false;
+          if (interval) {
+            clearInterval(interval);
+            interval = null;
+          }
+          sseControllers.delete(controller);
+          if (unsubscribe) {
+            unsubscribe();
+          }
+        };
+
+        // Send current device data
+        function sendDevices() {
+          if (!isConnected) {
+            cleanup();
+            return;
+          }
+
+          try {
+            const devices = getCurrentDevices();
+            const message = {
+              devices: devices,
+              timestamp: new Date().toISOString(),
+            };
+
+            // Check if controller is still valid before enqueueing
+            if (isConnected) {
+              controller.enqueue(`data: ${JSON.stringify(message)}\n\n`);
+            }
+          } catch (error) {
+            // Handle controller closed error specifically
+            if (
+              error.code === "ERR_INVALID_STATE" ||
+              error.message.includes("Controller is already closed")
+            ) {
+              console.log("MQTT SSE controller closed, stopping interval");
+            } else {
+              console.error("Error sending MQTT device data:", error);
+            }
+            cleanup();
+          }
+        }
+
+        // Send initial data
+        sendDevices();
+
+        // Send updates every 2 seconds
+        interval = setInterval(sendDevices, 2000);
+
+        // Subscribe to MQTT messages via the store for real-time updates
         const unsubscribe = latestMessage.subscribe((message) => {
-          if (message !== "No message yet") {
-            const data = `data: ${JSON.stringify({ message: message })}\n\n`;
-            controller.enqueue(data);
+          if (message !== "No message yet" && isConnected) {
+            try {
+              const data = `data: ${JSON.stringify({
+                message: message,
+                devices: getCurrentDevices(),
+                timestamp: new Date().toISOString(),
+              })}\n\n`;
+              if (isConnected) {
+                controller.enqueue(data);
+              }
+            } catch (error) {
+              if (
+                error.code === "ERR_INVALID_STATE" ||
+                error.message.includes("Controller is already closed")
+              ) {
+                console.log("MQTT SSE controller closed during message send");
+                cleanup();
+              }
+            }
           }
         });
 
         // Handle client disconnection
         request.signal.addEventListener("abort", () => {
-          console.log("Client disconnected from SSE stream.");
-          unsubscribe(); // Stop listening to store updates
-          controller.close();
+          console.log("Client disconnected from MQTT SSE stream");
+          cleanup();
         });
       },
       cancel() {
-        console.log("SSE stream cancelled.");
+        console.log("MQTT SSE stream cancelled");
       },
     }),
     { headers },