diff --git a/.idea/appInsightsSettings.xml b/.idea/appInsightsSettings.xml
new file mode 100644
index 0000000..23b2e1f
--- /dev/null
+++ b/.idea/appInsightsSettings.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AppInsightsSettings">
+    <option name="selectedTabId" value="Firebase Crashlytics" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index b589d56..b86273d 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="CompilerConfiguration">
-    <bytecodeTargetLevel target="17" />
+    <bytecodeTargetLevel target="21" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 7b2f86d..53140f1 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -4,6 +4,7 @@
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
+        <option name="testRunner" value="CHOOSE_PER_TEST" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
         <option name="gradleJvm" value="#GRADLE_LOCAL_JAVA_HOME" />
         <option name="modules">
diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
index 44ca2d9..6195b36 100644
--- a/.idea/inspectionProfiles/Project_Default.xml
+++ b/.idea/inspectionProfiles/Project_Default.xml
@@ -1,6 +1,30 @@
 <component name="InspectionProjectProfileManager">
   <profile version="1.0">
     <option name="myName" value="Project Default" />
+    <inspection_tool class="ComposePreviewDimensionRespectsLimit" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="ComposePreviewMustBeTopLevelFunction" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="ComposePreviewNeedsComposableAnnotation" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="ComposePreviewNotSupportedInUnitTestFiles" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="GlancePreviewDimensionRespectsLimit" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="GlancePreviewMustBeTopLevelFunction" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="GlancePreviewNeedsComposableAnnotation" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="GlancePreviewNotSupportedInUnitTestFiles" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
     <inspection_tool class="PreviewAnnotationInFunctionWithParameters" enabled="true" level="ERROR" enabled_by_default="true">
       <option name="composableFile" value="true" />
       <option name="previewFile" value="true" />
@@ -9,6 +33,9 @@
       <option name="composableFile" value="true" />
       <option name="previewFile" value="true" />
     </inspection_tool>
+    <inspection_tool class="PreviewDeviceShouldUseNewSpec" enabled="true" level="WEAK WARNING" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
     <inspection_tool class="PreviewDimensionRespectsLimit" enabled="true" level="WARNING" enabled_by_default="true">
       <option name="composableFile" value="true" />
       <option name="previewFile" value="true" />
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 493a466..7062a71 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="DesignSurface">
     <option name="filePathToZoomLevelMap">
@@ -8,7 +9,7 @@
       </map>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/.idea/other.xml b/.idea/other.xml
deleted file mode 100644
index 94c96f6..0000000
--- a/.idea/other.xml
+++ /dev/null
@@ -1,318 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="direct_access_persist.xml">
-    <option name="deviceSelectionList">
-      <list>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="27" />
-          <option name="brand" value="DOCOMO" />
-          <option name="codename" value="F01L" />
-          <option name="id" value="F01L" />
-          <option name="manufacturer" value="FUJITSU" />
-          <option name="name" value="F-01L" />
-          <option name="screenDensity" value="360" />
-          <option name="screenX" value="720" />
-          <option name="screenY" value="1280" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="28" />
-          <option name="brand" value="DOCOMO" />
-          <option name="codename" value="SH-01L" />
-          <option name="id" value="SH-01L" />
-          <option name="manufacturer" value="SHARP" />
-          <option name="name" value="AQUOS sense2 SH-01L" />
-          <option name="screenDensity" value="480" />
-          <option name="screenX" value="1080" />
-          <option name="screenY" value="2160" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="31" />
-          <option name="brand" value="samsung" />
-          <option name="codename" value="a51" />
-          <option name="id" value="a51" />
-          <option name="manufacturer" value="Samsung" />
-          <option name="name" value="Galaxy A51" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="1080" />
-          <option name="screenY" value="2400" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="34" />
-          <option name="brand" value="google" />
-          <option name="codename" value="akita" />
-          <option name="id" value="akita" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel 8a" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="1080" />
-          <option name="screenY" value="2400" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="33" />
-          <option name="brand" value="samsung" />
-          <option name="codename" value="b0q" />
-          <option name="id" value="b0q" />
-          <option name="manufacturer" value="Samsung" />
-          <option name="name" value="Galaxy S22 Ultra" />
-          <option name="screenDensity" value="600" />
-          <option name="screenX" value="1440" />
-          <option name="screenY" value="3088" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="32" />
-          <option name="brand" value="google" />
-          <option name="codename" value="bluejay" />
-          <option name="id" value="bluejay" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel 6a" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="1080" />
-          <option name="screenY" value="2400" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="34" />
-          <option name="brand" value="google" />
-          <option name="codename" value="caiman" />
-          <option name="id" value="caiman" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel 9 Pro" />
-          <option name="screenDensity" value="360" />
-          <option name="screenX" value="960" />
-          <option name="screenY" value="2142" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="34" />
-          <option name="brand" value="google" />
-          <option name="codename" value="comet" />
-          <option name="id" value="comet" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel 9 Pro Fold" />
-          <option name="screenDensity" value="390" />
-          <option name="screenX" value="2076" />
-          <option name="screenY" value="2152" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="29" />
-          <option name="brand" value="samsung" />
-          <option name="codename" value="crownqlteue" />
-          <option name="id" value="crownqlteue" />
-          <option name="manufacturer" value="Samsung" />
-          <option name="name" value="Galaxy Note9" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="2220" />
-          <option name="screenY" value="1080" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="34" />
-          <option name="brand" value="samsung" />
-          <option name="codename" value="dm3q" />
-          <option name="id" value="dm3q" />
-          <option name="manufacturer" value="Samsung" />
-          <option name="name" value="Galaxy S23 Ultra" />
-          <option name="screenDensity" value="600" />
-          <option name="screenX" value="1440" />
-          <option name="screenY" value="3088" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="34" />
-          <option name="brand" value="samsung" />
-          <option name="codename" value="e1q" />
-          <option name="id" value="e1q" />
-          <option name="manufacturer" value="Samsung" />
-          <option name="name" value="Galaxy S24" />
-          <option name="screenDensity" value="480" />
-          <option name="screenX" value="1080" />
-          <option name="screenY" value="2340" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="33" />
-          <option name="brand" value="google" />
-          <option name="codename" value="felix" />
-          <option name="id" value="felix" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel Fold" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="2208" />
-          <option name="screenY" value="1840" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="34" />
-          <option name="brand" value="google" />
-          <option name="codename" value="felix" />
-          <option name="id" value="felix" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel Fold" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="2208" />
-          <option name="screenY" value="1840" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="33" />
-          <option name="brand" value="google" />
-          <option name="codename" value="felix_camera" />
-          <option name="id" value="felix_camera" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel Fold (Camera-enabled)" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="2208" />
-          <option name="screenY" value="1840" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="33" />
-          <option name="brand" value="samsung" />
-          <option name="codename" value="gts8uwifi" />
-          <option name="id" value="gts8uwifi" />
-          <option name="manufacturer" value="Samsung" />
-          <option name="name" value="Galaxy Tab S8 Ultra" />
-          <option name="screenDensity" value="320" />
-          <option name="screenX" value="1848" />
-          <option name="screenY" value="2960" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="34" />
-          <option name="brand" value="google" />
-          <option name="codename" value="husky" />
-          <option name="id" value="husky" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel 8 Pro" />
-          <option name="screenDensity" value="390" />
-          <option name="screenX" value="1008" />
-          <option name="screenY" value="2244" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="30" />
-          <option name="brand" value="motorola" />
-          <option name="codename" value="java" />
-          <option name="id" value="java" />
-          <option name="manufacturer" value="Motorola" />
-          <option name="name" value="G20" />
-          <option name="screenDensity" value="280" />
-          <option name="screenX" value="720" />
-          <option name="screenY" value="1600" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="34" />
-          <option name="brand" value="google" />
-          <option name="codename" value="komodo" />
-          <option name="id" value="komodo" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel 9 Pro XL" />
-          <option name="screenDensity" value="360" />
-          <option name="screenX" value="1008" />
-          <option name="screenY" value="2244" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="33" />
-          <option name="brand" value="google" />
-          <option name="codename" value="lynx" />
-          <option name="id" value="lynx" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel 7a" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="1080" />
-          <option name="screenY" value="2400" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="31" />
-          <option name="brand" value="google" />
-          <option name="codename" value="oriole" />
-          <option name="id" value="oriole" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel 6" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="1080" />
-          <option name="screenY" value="2400" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="33" />
-          <option name="brand" value="google" />
-          <option name="codename" value="panther" />
-          <option name="id" value="panther" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel 7" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="1080" />
-          <option name="screenY" value="2400" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="34" />
-          <option name="brand" value="samsung" />
-          <option name="codename" value="q5q" />
-          <option name="id" value="q5q" />
-          <option name="manufacturer" value="Samsung" />
-          <option name="name" value="Galaxy Z Fold5" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="1812" />
-          <option name="screenY" value="2176" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="30" />
-          <option name="brand" value="google" />
-          <option name="codename" value="r11" />
-          <option name="id" value="r11" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel Watch" />
-          <option name="screenDensity" value="320" />
-          <option name="screenX" value="384" />
-          <option name="screenY" value="384" />
-          <option name="type" value="WEAR_OS" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="30" />
-          <option name="brand" value="google" />
-          <option name="codename" value="redfin" />
-          <option name="id" value="redfin" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel 5" />
-          <option name="screenDensity" value="440" />
-          <option name="screenX" value="1080" />
-          <option name="screenY" value="2340" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="34" />
-          <option name="brand" value="google" />
-          <option name="codename" value="shiba" />
-          <option name="id" value="shiba" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel 8" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="1080" />
-          <option name="screenY" value="2400" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="33" />
-          <option name="brand" value="google" />
-          <option name="codename" value="tangorpro" />
-          <option name="id" value="tangorpro" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel Tablet" />
-          <option name="screenDensity" value="320" />
-          <option name="screenX" value="1600" />
-          <option name="screenY" value="2560" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="34" />
-          <option name="brand" value="google" />
-          <option name="codename" value="tokay" />
-          <option name="id" value="tokay" />
-          <option name="manufacturer" value="Google" />
-          <option name="name" value="Pixel 9" />
-          <option name="screenDensity" value="420" />
-          <option name="screenX" value="1080" />
-          <option name="screenY" value="2424" />
-        </PersistentDeviceSelectionData>
-        <PersistentDeviceSelectionData>
-          <option name="api" value="29" />
-          <option name="brand" value="samsung" />
-          <option name="codename" value="x1q" />
-          <option name="id" value="x1q" />
-          <option name="manufacturer" value="Samsung" />
-          <option name="name" value="Galaxy S20" />
-          <option name="screenDensity" value="480" />
-          <option name="screenX" value="1440" />
-          <option name="screenY" value="3200" />
-        </PersistentDeviceSelectionData>
-      </list>
-    </option>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/runConfigurations.xml b/.idea/runConfigurations.xml
new file mode 100644
index 0000000..16660f1
--- /dev/null
+++ b/.idea/runConfigurations.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="com.intellij.execution.junit.AbstractAllInDirectoryConfigurationProducer" />
+        <option value="com.intellij.execution.junit.AllInPackageConfigurationProducer" />
+        <option value="com.intellij.execution.junit.PatternConfigurationProducer" />
+        <option value="com.intellij.execution.junit.TestInClassConfigurationProducer" />
+        <option value="com.intellij.execution.junit.UniqueIdConfigurationProducer" />
+        <option value="com.intellij.execution.junit.testDiscovery.JUnitTestDiscoveryConfigurationProducer" />
+        <option value="org.jetbrains.kotlin.idea.junit.KotlinJUnitRunConfigurationProducer" />
+        <option value="org.jetbrains.kotlin.idea.junit.KotlinPatternConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 9a570e8..2966851 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -12,7 +12,7 @@ android {
 
     defaultConfig {
         applicationId "com.nphausg.app.embeddedserver"
-        minSdk 21
+        minSdk 26
         targetSdk 34
         versionCode 1
         versionName "1.0.0"
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 1b74893..a64d2de 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,9 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
+    <uses-feature
+        android:name="android.hardware.telephony"
+        android:required="true" />
+
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+    <uses-permission android:name="android.permission.SEND_SMS" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC"/>
 
     <application
         android:allowBackup="true"
@@ -12,6 +19,12 @@
         android:roundIcon="@mipmap/ic_launcher"
         android:supportsRtl="true"
         android:theme="@style/Theme.AppCompat.DayNight.NoActionBar">
+        <service
+            android:name=".service.EmbeddedServerService"
+            android:enabled="true"
+            android:foregroundServiceType="dataSync"
+            android:exported="false"></service>
+
         <activity
             android:name=".activities.MainActivity"
             android:exported="true">
@@ -21,6 +34,7 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
         <provider
             android:name="androidx.core.content.FileProvider"
             android:authorities="${applicationId}.provider"
@@ -28,7 +42,6 @@
             android:exported="false"
             android:grantUriPermissions="true"
             android:permission="android.permission.MANAGE_DOCUMENTS">
-
             <intent-filter>
                 <action android:name="android.content.action.DOCUMENTS_PROVIDER" />
             </intent-filter>
diff --git a/app/src/main/java/com/nphausg/app/embeddedserver/EmbeddedServer.kt b/app/src/main/java/com/nphausg/app/embeddedserver/EmbeddedServer.kt
index fba3317..d41b29b 100644
--- a/app/src/main/java/com/nphausg/app/embeddedserver/EmbeddedServer.kt
+++ b/app/src/main/java/com/nphausg/app/embeddedserver/EmbeddedServer.kt
@@ -1,12 +1,7 @@
-/*
- * Created by nphau on 4/10/24, 7:04 PM
- * Copyright (c) 2024 . All rights reserved.
- * Last modified 4/10/24, 7:04 PM
- */
-
 package com.nphausg.app.embeddedserver
 
 import android.os.Build
+import android.telephony.SmsManager
 import com.nphausg.app.embeddedserver.data.Database
 import com.nphausg.app.embeddedserver.data.models.Cart
 import com.nphausg.app.embeddedserver.utils.FileUtils
@@ -15,25 +10,28 @@ import io.ktor.http.ContentDisposition
 import io.ktor.http.ContentType
 import io.ktor.http.HttpHeaders
 import io.ktor.http.HttpStatusCode
-import io.ktor.http.HttpStatusCode.Companion.PartialContent
 import io.ktor.serialization.kotlinx.json.json
 import io.ktor.server.application.ApplicationCall
 import io.ktor.server.application.call
 import io.ktor.server.application.install
+import io.ktor.server.engine.ApplicationEngine
 import io.ktor.server.engine.embeddedServer
 import io.ktor.server.http.content.staticResources
 import io.ktor.server.netty.Netty
 import io.ktor.server.plugins.contentnegotiation.ContentNegotiation
 import io.ktor.server.plugins.cors.routing.CORS
+import io.ktor.server.request.receive
 import io.ktor.server.response.header
 import io.ktor.server.response.respond
 import io.ktor.server.response.respondFile
 import io.ktor.server.response.respondText
 import io.ktor.server.routing.get
+import io.ktor.server.routing.post
 import io.ktor.server.routing.routing
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.serialization.Serializable
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
 import java.io.File
@@ -43,63 +41,69 @@ object EmbeddedServer {
     private const val PORT = 6868
     private val ioScope = CoroutineScope(Dispatchers.IO)
     private const val FILE_NAME = "file.jpg"
-    private const val MP3_FILE_NAME = "bye_bye_bye_nsync.mp3"
-
-    private val server by lazy {
-        embeddedServer(Netty, PORT) {
-            // configures Cross-Origin Resource Sharing. CORS is needed to make calls from arbitrary
-            // JavaScript clients, and helps us prevent issues down the line.
-            install(CORS) {
-                anyHost()
-            }
-            install(ContentNegotiation) {
-                json(Json {
-                    prettyPrint = true
-                    isLenient = true
-                })
-            }
-            routing {
-                //  staticResources
-                staticResources("/static", "") {
-                    default("index.html")
-                }
-                get("/") {
-                    okText(call, "Hello!! You are here in ${Build.MODEL}")
-                }
-                get("/fruits") {
-                    okText(call, FileUtils.readText("data.json").also {
-                        Database.FRUITS.addAll(FileUtils.decode<Cart>(it).items)
-                    })
-                }
-                get("/fruits/{id}") {
-                    val id = call.parameters["id"]
-                    val fruit = Database.FRUITS.find { it.id == id }
-                    if (fruit != null) {
-                        okText(call, Json.encodeToString(fruit))
-                    } else {
-                        call.respond(HttpStatusCode.NotFound)
-                    }
-                }
-                get("/download") {
-                    val file = File("files/$FILE_NAME")
-                    call.response.header(
-                        HttpHeaders.ContentDisposition,
-                        ContentDisposition.Attachment.withParameter(
-                            key = ContentDisposition.Parameters.FileName,
-                            value = FILE_NAME
-                        ).toString()
-                    )
-                    call.response.status(HttpStatusCode.OK)
-                    call.respondFile(file)
-                }
-            }
-        }
-    }
+    private var server: ApplicationEngine? = null
 
     fun start() {
         ioScope.launch {
             try {
-                server.start(wait = true)
+                if (server == null) {
+                    server = embeddedServer(Netty, PORT) {
+                        install(CORS) {
+                            anyHost()
+                        }
+                        install(ContentNegotiation) {
+                            json(Json {
+                                prettyPrint = true
+                                isLenient = true
+                            })
+                        }
+                        routing {
+                            staticResources("/static", "") {
+                                default("index.html")
+                            }
+                            get("/") {
+                                okText(call, "Hello!! You are here in ${Build.MODEL}")
+                            }
+                            get("/fruits") {
+                                okText(call, FileUtils.readText("data.json").also {
+                                    Database.FRUITS.addAll(FileUtils.decode<Cart>(it).items)
+                                })
+                            }
+                            get("/fruits/{id}") {
+                                val id = call.parameters["id"]
+                                val fruit = Database.FRUITS.find { it.id == id }
+                                if (fruit != null) {
+                                    okText(call, Json.encodeToString(fruit))
+                                } else {
+                                    call.respond(HttpStatusCode.NotFound)
+                                }
+                            }
+                            get("/download") {
+                                val file = File("files/$FILE_NAME")
+                                call.response.header(
+                                    HttpHeaders.ContentDisposition,
+                                    ContentDisposition.Attachment.withParameter(
+                                        key = ContentDisposition.Parameters.FileName,
+                                        value = FILE_NAME
+                                    ).toString()
+                                )
+                                call.response.status(HttpStatusCode.OK)
+                                call.respondFile(file)
+                            }
+                            post("/send_sms") {
+                                val smsRequest = call.receive<SmsRequest>()
+                                try {
+                                    val smsManager: SmsManager = SmsManager.getDefault()
+                                    smsManager.sendTextMessage(smsRequest.phoneNumber, null, smsRequest.message, null, null)
+                                    call.respond(HttpStatusCode.OK, "SMS Sent to ${smsRequest.phoneNumber}")
+                                } catch (e: Exception) {
+                                    call.respond(HttpStatusCode.BadRequest, "Error sending SMS: $e")
+                                }
+                            }
+                        }
+                    }
+                }
+                server?.start(wait = false)
             } catch (e: Exception) {
                 e.printStackTrace()
             }
@@ -108,7 +112,8 @@ object EmbeddedServer {
 
     fun stop() {
         try {
-            server.stop(1_000, 2_000)
+            server?.stop(1_000, 2_000)
+            server = null
         } catch (e: Exception) {
             e.printStackTrace()
         }
@@ -124,4 +129,10 @@ object EmbeddedServer {
             contentType = ContentType.Application.Json
         )
     }
-}
\ No newline at end of file
+}
+
+@Serializable
+data class SmsRequest(
+    val phoneNumber: String,
+    val message: String
+)
diff --git a/app/src/main/java/com/nphausg/app/embeddedserver/EmbeddedServerService.kt b/app/src/main/java/com/nphausg/app/embeddedserver/EmbeddedServerService.kt
new file mode 100644
index 0000000..baae4bd
--- /dev/null
+++ b/app/src/main/java/com/nphausg/app/embeddedserver/EmbeddedServerService.kt
@@ -0,0 +1,51 @@
+package com.nphausg.app.embeddedserver.service
+
+import android.app.*
+import android.content.Intent
+import android.os.Build
+import android.os.IBinder
+import androidx.core.app.NotificationCompat
+import com.nphausg.app.embeddedserver.EmbeddedServer
+import com.nphausg.app.embeddedserver.R
+
+class EmbeddedServerService : Service() {
+
+    override fun onCreate() {
+        super.onCreate()
+        startForegroundService()
+        EmbeddedServer.start()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        EmbeddedServer.stop()
+    }
+
+    private fun startForegroundService() {
+        val channelId = "embedded_server_channel"
+        val channelName = "Embedded Server Service"
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            val channel = NotificationChannel(
+                channelId,
+                channelName,
+                NotificationManager.IMPORTANCE_LOW
+            )
+            val manager = getSystemService(NotificationManager::class.java)
+            manager?.createNotificationChannel(channel)
+        }
+
+        val notification = NotificationCompat.Builder(this, channelId)
+            .setContentTitle("Embedded Server Running")
+            .setContentText("Your server is running in the background.")
+            .setSmallIcon(R.drawable.ic_launcher_foreground)
+            .setOngoing(true)
+            .build()
+
+        startForeground(1, notification)
+    }
+
+    override fun onBind(intent: Intent?): IBinder? {
+        return null
+    }
+}
diff --git a/app/src/main/java/com/nphausg/app/embeddedserver/activities/MainActivity.kt b/app/src/main/java/com/nphausg/app/embeddedserver/activities/MainActivity.kt
index bde465f..e80fc93 100644
--- a/app/src/main/java/com/nphausg/app/embeddedserver/activities/MainActivity.kt
+++ b/app/src/main/java/com/nphausg/app/embeddedserver/activities/MainActivity.kt
@@ -6,10 +6,14 @@
 
 package com.nphausg.app.embeddedserver.activities
 
+import android.app.ActivityManager
+import android.content.Context
+import android.content.Intent
 import android.os.Build
 import android.os.Bundle
 import androidx.activity.compose.setContent
 import androidx.appcompat.app.AppCompatActivity
+import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.core.Animatable
 import androidx.compose.animation.core.LinearEasing
 import androidx.compose.animation.core.RepeatMode
@@ -19,6 +23,7 @@ import androidx.compose.animation.core.rememberInfiniteTransition
 import androidx.compose.animation.core.tween
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.gestures.detectDragGestures
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
@@ -32,6 +37,9 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.PlayArrow
 import androidx.compose.material3.Card
 import androidx.compose.material3.Icon
 import androidx.compose.material3.LinearProgressIndicator
@@ -52,6 +60,7 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.graphicsLayer
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.Dp
@@ -66,10 +75,13 @@ import com.masewsg.app.ui.components.icon.ComposeIcons
 import com.masewsg.app.ui.components.theme.ComposeTheme
 import com.nphausg.app.embeddedserver.EmbeddedServer
 import com.nphausg.app.embeddedserver.R
+import com.nphausg.app.embeddedserver.activities.ServiceUtils.isServiceRunning
+import com.nphausg.app.embeddedserver.service.EmbeddedServerService
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlin.time.Duration.Companion.seconds
 
+
 private val getRunningServerInfo = { ticks: Int ->
     "The server is running on: ${Build.MODEL} at ${EmbeddedServer.host} -> (${ticks}s ....)"
 }
@@ -82,6 +94,7 @@ class MainActivity : AppCompatActivity() {
         // Keep the splash screen on-screen until the UI state is loaded. This condition is
         // evaluated each time the app needs to be redrawn so it should be fast to avoid blocking
         // the UI.
+
         splashScreen.setKeepOnScreenCondition {
             false
         }
@@ -100,12 +113,56 @@ class MainActivity : AppCompatActivity() {
         }
     }
 
+
     override fun onDestroy() {
         super.onDestroy()
         // EmbeddedServer.stop()
     }
 }
 
+@Composable
+fun ClickableRowWithDropdown() {
+    var expanded by remember { mutableStateOf(false) }
+
+    Column {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .clickable { expanded = !expanded }
+                .padding(8.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            Icon(imageVector = ComposeIcons.PlayArrow, contentDescription = null)
+            Spacer(modifier = Modifier.width(8.dp))
+            Text(
+                color = Color.Black,
+                textAlign = TextAlign.Start,
+                text = String.format("POST: %s/send_sms", EmbeddedServer.host),
+                style = MaterialTheme.typography.titleMedium,
+            )
+        }
+
+
+        AnimatedVisibility(visible = expanded) {
+            Text(
+                text = "{\n" +
+                        "    \"phoneNumber\": \"your phone number\",\n" +
+                        "    \"message\": \"your message \"\n" +
+                        "}",
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(8.dp)
+                    .background(Color.LightGray, shape = RoundedCornerShape(8.dp))
+                    .padding(8.dp),
+                color = Color.Black,
+                style = MaterialTheme.typography.bodyMedium
+            )
+        }
+    }
+}
+
+
+
 @Composable
 private fun Logo() {
 
@@ -177,6 +234,7 @@ private fun MainScreen(modifier: Modifier = Modifier) {
         }
     }
 
+
     var hasStarted by remember { mutableStateOf(false) }
 
     val value by rememberInfiniteTransition(label = "")
@@ -244,6 +302,17 @@ private fun MainScreen(modifier: Modifier = Modifier) {
                     style = MaterialTheme.typography.titleMedium,
                 )
             }
+//            Row {
+//                Icon(imageVector = ComposeIcons.PlayArrow, contentDescription = null)
+//                Text(
+//                    color = Color.Black,
+//                    textAlign = TextAlign.Start,
+//                    text = String.format("POST: %s/send_sms", EmbeddedServer.host),
+//                    style = MaterialTheme.typography.titleMedium,
+//                )
+//            }
+            ClickableRowWithDropdown()
+
 
             Row {
                 Icon(imageVector = ComposeIcons.PlayArrow, contentDescription = null)
@@ -255,6 +324,16 @@ private fun MainScreen(modifier: Modifier = Modifier) {
                 )
             }
 
+
+        }
+        val context = LocalContext.current
+//        val isRunning = isServiceRunning(
+//            context,
+//            EmbeddedServerService::class.java
+//        )
+        val isrunning = isServiceRunning(context,EmbeddedServerService::class.java)
+        if (isrunning) {
+            hasStarted = true
         }
 
         Row(
@@ -266,8 +345,20 @@ private fun MainScreen(modifier: Modifier = Modifier) {
                 enabled = !hasStarted,
                 modifier = reusedModifier,
                 onClick = {
+                    val serviceIntent = Intent(context, EmbeddedServerService::class.java)
+                    if(isrunning){
+
+                    EmbeddedServer.stop()
+                    context.stopService(serviceIntent);
+                    }
                     hasStarted = true
-                    EmbeddedServer.start()
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                        context.startForegroundService(serviceIntent)
+                    } else {
+                        context.startService(serviceIntent)
+                    }
+
+                   // EmbeddedServer.start()
                 },
                 text = { Text("Start") }
             )
@@ -278,7 +369,10 @@ private fun MainScreen(modifier: Modifier = Modifier) {
                 onClick = {
                     ticks = 0
                     hasStarted = false
-                    EmbeddedServer.stop()
+                    val serviceIntent = Intent(context, EmbeddedServerService::class.java)
+                    context.stopService(serviceIntent);
+                   // EmbeddedServer.stop()
+
                 },
                 text = { Text("Stop") }
             )
@@ -321,4 +415,18 @@ private fun MainScreenPreview() {
             MainScreen()
         }
     }
-}
\ No newline at end of file
+}
+
+
+
+object ServiceUtils {
+    fun isServiceRunning(context: Context, serviceClass: Class<*>): Boolean {
+        val manager = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
+        for (service in manager.getRunningServices(Int.MAX_VALUE)) {
+            if (serviceClass.name == service.service.className) {
+                return true
+            }
+        }
+        return false
+    }
+}