diff --git a/controllers/modbus.controller.js b/controllers/modbus.controller.js
index 2fb1df8..c0bfb87 100644
--- a/controllers/modbus.controller.js
+++ b/controllers/modbus.controller.js
@@ -1,6 +1,5 @@
 import db from "#root/config/database.config.js";
 import modbusClient from "#root/config/modbus-client.config.js";
-import * as utils from '#root/utils/index.js'
 import { appService, modbusService } from "#root/services/index.js";
 
 export const modbusController = {
@@ -12,30 +11,10 @@ export const modbusController = {
    */
   async connect(req, res, next) {
     try {
-      const config = await appService.getConfig(db);
-      if (!config) return res.status(400).json({ message: "Application is not configured" });
-
-      if (modbusClient.isOpen) {
-        modbusClient.close(undefined);
-        modbusClient.destroy(undefined);
-      }
-
-      if (config.mb_connection_type === "TCP") {
-        await modbusClient.connectTCP(config.mb_tcp_ip, { port: config.mb_tcp_port });
-        return res.status(200).json({ message: "Connected." });
-      }
-
-      if (config.mb_connection_type === "RTU") {
-        await modbusClient.connectRTU(config.mb_rtu_path, {
-          baudRate: config.mb_rtu_baud,
-          dataBits: config.mb_rtu_data_bits,
-          parity: config.mb_rtu_parity,
-          stopBits: config.mb_rtu_stop_bits,
-        });
-        return res.status(200).json({ message: "Connected." });
-      }
-
-      return res.status(400).json({ message: "Connection type is invalid." });
+      const appConfig = await appService.getConfig();
+      if (!appConfig) return res.status(400).json({ message: "Application is not configured" });
+      await modbusService.connect(appConfig)
+      return res.status(200).json({ message: "Connected." });
     } catch (error) {
       next(error);
     }
@@ -66,25 +45,8 @@ export const modbusController = {
    */
   async list(req, res, next) {
     try {
-      const slaves = await db.all(`
-          SELECT  ms.id AS id, ms.name AS name, g_display_reg_addr, g_display_reg_format, g_display_reg_type, g_y_label, is_logging,
-          CASE
-            WHEN COUNT(dv.id) = 0 THEN '[]'
-            ELSE '[' || GROUP_CONCAT(
-              JSON_OBJECT(
-                'id', dv.id,
-                'name', dv.name,
-                'reg_addr', dv.reg_addr,
-                'reg_format', dv.reg_format,
-                'reg_type', dv.reg_type
-              ), ', '
-            ) || ']' END AS display_values
-          FROM modbus_slaves AS ms
-          LEFT JOIN display_values AS dv ON dv.slave_id = ms.id
-          GROUP BY ms.id, ms.name;
-      `);
-      slaves.forEach((s) => (s.display_values = JSON.parse(s.display_values)));
-      return res.status(200).json(slaves);
+      const devices = await modbusService.getDevices();
+      return res.status(200).json(devices);
     } catch (error) {
       next(error);
     }
@@ -218,6 +180,8 @@ export const modbusController = {
       if (!device) 
         return res.status(404).json({ error: { message: "Device not found." } });
 
+      // modbusService.createPollInterval(req, res, device).poll(1000);
+
       res.setHeader("Cache-Control", "no-cache");
       res.setHeader("Content-Type", "text/event-stream");
       res.setHeader("Connection", "keep-alive");
diff --git a/data.db b/data.db
index 73f3c09..2b1489b 100644
Binary files a/data.db and b/data.db differ
diff --git a/public/css/dist.css b/public/css/dist.css
index d8092ab..d242996 100644
--- a/public/css/dist.css
+++ b/public/css/dist.css
@@ -774,6 +774,14 @@ video {
   max-width: 64rem;
 }
 
+.max-w-xl {
+  max-width: 36rem;
+}
+
+.max-w-md {
+  max-width: 28rem;
+}
+
 .flex-1 {
   flex: 1 1 0%;
 }
@@ -956,6 +964,10 @@ video {
   padding: 20rem;
 }
 
+.p-5 {
+  padding: 1.25rem;
+}
+
 .px-2 {
   padding-left: 0.5rem;
   padding-right: 0.5rem;
@@ -971,6 +983,21 @@ video {
   padding-bottom: 0.75rem;
 }
 
+.px-6 {
+  padding-left: 1.5rem;
+  padding-right: 1.5rem;
+}
+
+.py-4 {
+  padding-top: 1rem;
+  padding-bottom: 1rem;
+}
+
+.px-5 {
+  padding-left: 1.25rem;
+  padding-right: 1.25rem;
+}
+
 .pl-0 {
   padding-left: 0px;
 }
diff --git a/public/index.html b/public/index.html
index 8bae9e4..d9b2150 100644
--- a/public/index.html
+++ b/public/index.html
@@ -264,7 +264,7 @@
       <!-- Configuration content -->
       <template x-if="$store.app.currentPage === 'configuration'">
         <main class="mt-6 mb-2" x-data="configAppPage" x-bind:hidden="$store.app.currentPage !== 'configuration'">
-          <div class="border rounded-sm p-4 max-w-2xl mx-auto">
+          <div class="border rounded-sm p-5 max-w-md mx-auto mb-2">
             <h2 class="text-2xl font-bold">Setup configuration</h2>
             <p class="text-gray-700 italic">
               Fill in the required configuration settings to connect to the Modbus network.
@@ -273,7 +273,7 @@
             <form @submit.prevent="configurateApp()" action="#">
               <div>
                 <div>
-                  <label class="block" for="connection_type">Network type</label>
+                  <label class="block" for="connection_type"><span class="text-red-500">*</span>Network type</label>
                   <select
                     x-model="$store.app.config.mb_connection_type"
                     name="mb_connection_type"
@@ -287,7 +287,7 @@
 
                 <div x-show="$store.app.config.mb_connection_type === 'TCP'" class="flex flex-col space-y-3">
                   <div>
-                    <label for="tcp_ip">IP</label>
+                    <label for="tcp_ip"><span class="text-red-500">*</span>IP</label>
                     <input
                       x-model="$store.app.config.mb_tcp_ip"
                       id="tcp_ip"
@@ -299,7 +299,7 @@
                   </div>
 
                   <div>
-                    <label for="rtu_port">Port</label>
+                    <label for="rtu_port"><span class="text-red-500">*</span>Port</label>
                     <input
                       x-model.number="$store.app.config.mb_tcp_port"
                       id="rtu_port"
@@ -313,7 +313,7 @@
 
                 <div x-show="$store.app.config.mb_connection_type === 'RTU'" class="flex flex-col space-y-3">
                   <div>
-                    <label for="rtu_path">Path</label>
+                    <label for="rtu_path"><span class="text-red-500">*</span>Path</label>
                     <input
                       id="rtu_path"
                       name="mb_rtu_path"
@@ -325,7 +325,7 @@
                   </div>
 
                   <div>
-                    <label for="rtu_baud">Baud</label>
+                    <label for="rtu_baud"><span class="text-red-500">*</span>Baud</label>
                     <select
                       name="mb_rtu_baud"
                       id="rtu_baud"
@@ -342,7 +342,7 @@
                   </div>
 
                   <div>
-                    <label for="rtu_parity">Parity</label>
+                    <label for="rtu_parity"><span class="text-red-500">*</span>Parity</label>
                     <select
                       name="mb_rtu_parity"
                       id="rtu_parity"
@@ -356,7 +356,7 @@
                   </div>
 
                   <div>
-                    <label for="rtu_data_bits">Data bits</label>
+                    <label for="rtu_data_bits"><span class="text-red-500">*</span>Data bits</label>
                     <select
                       name="mb_rtu_data_bits"
                       id="rtu_data_bits"
@@ -371,7 +371,7 @@
                   </div>
 
                   <div>
-                    <label for="rtu_stop_bits">Stop bits</label>
+                    <label for="rtu_stop_bits"><span class="text-red-500">*</span>Stop bits</label>
                     <select
                       name="mb_rtu_stop_bits"
                       id="rtu_stop_bits"
@@ -386,7 +386,7 @@
               </div>
 
               <div class="mt-2">
-                <label for="rtu_path">Log Interval (ms)</label>
+                <label for="rtu_path"><span class="text-red-500">*</span>Log Interval (ms)</label>
                 <input
                   id="log_interval_ms"
                   name="log_interval_ms"
diff --git a/services/app.service.js b/services/app.service.js
index 27ce3f8..03e3b4b 100644
--- a/services/app.service.js
+++ b/services/app.service.js
@@ -1,10 +1,11 @@
+import db from "#root/config/database.config.js";
+
 export const appService = {
   /**
    * Get configuration of app
-   * @param {import('sqlite').Database} db
    * @returns {Promise<import('../index').AppConfig | undefined>}
    */
-  async getConfig(db) {
+  async getConfig() {
     const data = await db.get(`
           SELECT  "mb_connection_type",
                   "mb_tcp_ip",
diff --git a/services/modbus.service.js b/services/modbus.service.js
index d8022a4..d4f3009 100644
--- a/services/modbus.service.js
+++ b/services/modbus.service.js
@@ -1,4 +1,5 @@
 import modbusClient from "#root/config/modbus-client.config.js";
+import db from "#root/config/database.config.js";
 import * as utils from '#root/utils/index.js'
 
 export const modbusService = {
@@ -35,6 +36,48 @@ export const modbusService = {
     return data;
   },
 
+  /**
+   * @param {import("..").AppConfig} appConfig
+   * @return {Promise<void>}
+   */
+  async connect(appConfig) {
+    const { 
+            mb_connection_type, 
+            mb_tcp_ip, 
+            mb_tcp_port,
+            mb_rtu_path,
+            mb_rtu_baud,
+            mb_rtu_data_bits,
+            mb_rtu_parity,
+            mb_rtu_stop_bits 
+          } = appConfig
+
+    if (modbusClient.isOpen) {
+      modbusClient.close(undefined);
+      modbusClient.destroy(undefined);
+    }
+
+    switch (mb_connection_type) {
+      case 'TCP':
+        {
+          await modbusClient.connectTCP(mb_tcp_ip, { port: mb_tcp_port });
+          break;
+        }
+      case "RTU":
+        {
+          await modbusClient.connectRTU(mb_rtu_path, {
+            baudRate: mb_rtu_baud,
+            dataBits: mb_rtu_data_bits,
+            parity: mb_rtu_parity,
+            stopBits: mb_rtu_stop_bits,
+          });
+          break;
+        }
+      default:
+        throw new Error('Unsupported connection type!')
+    }
+  },
+
   /**
    * @param {number} addr
    * @param {"HR" | "IR" | "DI"} type
@@ -70,5 +113,58 @@ export const modbusService = {
     }
   
     return data.buffer;
-  }
+  },
+
+  async getDevices() {
+    /** @type {import("..").ModbusDevice[]}  */
+    const devices = await db.all(`
+        SELECT  ms.id AS id, ms.name AS name, g_display_reg_addr, g_display_reg_format, g_display_reg_type, g_y_label, is_logging,
+        CASE
+          WHEN COUNT(dv.id) = 0 THEN '[]'
+          ELSE '[' || GROUP_CONCAT(
+            JSON_OBJECT(
+              'id', dv.id,
+              'name', dv.name,
+              'reg_addr', dv.reg_addr,
+              'reg_format', dv.reg_format,
+              'reg_type', dv.reg_type
+            ), ', '
+          ) || ']' END AS display_values
+        FROM modbus_slaves AS ms
+        LEFT JOIN display_values AS dv ON dv.slave_id = ms.id
+        GROUP BY ms.id, ms.name;
+    `);
+    // @ts-ignore
+    devices.forEach((s) => (s.display_values = JSON.parse(s.display_values)));
+    return devices
+  },
+
+  /**
+   * @param {import('express').Request} req
+   * @param {import('express').Response} res 
+   * @param {import("..").ModbusDevice} device
+   */
+  // createPollInterval(req, res, device, pollIntervalMs) {
+  //   let intervalId;
+
+  //   res.setHeader("Cache-Control", "no-cache");
+  //   res.setHeader("Content-Type", "text/event-stream");
+  //   res.setHeader("Connection", "keep-alive");
+
+  //   return {
+  //     /**
+  //      * @param {number} pollIntervalMs
+  //      */
+  //     poll(pollIntervalMs) {
+  //       intervalId = setInterval(async () => {
+  //         device.display_values = await db.all(`SELECT * FROM "display_values" WHERE slave_id = ?`, [device.id]) 
+  //         const data = await modbusService.readDataFromDevice(device);
+  //         res.write("event: message\n");
+  //         res.wriste(`data: ${JSON.stringify(data)}\n\n`);
+  //       }, pollIntervalMs)
+
+  //       req.on("close", () => clearInterval(intervalId));
+  //     }
+  //   }
+  // }
 }
\ No newline at end of file