diff --git a/app/build.gradle b/app/build.gradle
index 1158de0..b207d3c 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -18,8 +18,8 @@ android {
         applicationId "in.sminnovations.hpostesting.prod"
         minSdk 21
         targetSdk 34
-        versionCode 11
-        versionName "2.1.13"
+        versionCode 14
+        versionName "2.1.14"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 11d8e5e..3c91302 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -33,6 +33,13 @@
             android:parentActivityName="com.example.hpostesting.presentation.MainActivity"
             android:theme="@style/Theme.HPOS.NoActionBar"
             android:windowSoftInputMode="adjustPan" />
+        <activity
+            android:name="com.example.hpostesting.presentation.buffercheck.HemocubeBufferCheckActivity"
+            android:exported="false"
+            android:noHistory="true"
+            android:parentActivityName="com.example.hpostesting.presentation.MainActivity"
+            android:theme="@style/Theme.HPOS.NoActionBar"
+            android:windowSoftInputMode="adjustPan" />
         <activity
             android:name="com.example.hpostesting.presentation.KitScanActivity"
             android:exported="false"
@@ -94,6 +101,7 @@
             android:screenOrientation="portrait"
             android:stateNotNeeded="true"
             tools:replace="android:screenOrientation" />
+
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/com/example/hpostesting/presentation/buffercheck/HemoCubeBufferCheckFragment.kt b/app/src/main/java/com/example/hpostesting/presentation/buffercheck/HemoCubeBufferCheckFragment.kt
new file mode 100644
index 0000000..e8fb957
--- /dev/null
+++ b/app/src/main/java/com/example/hpostesting/presentation/buffercheck/HemoCubeBufferCheckFragment.kt
@@ -0,0 +1,310 @@
+package com.example.hpostesting.presentation.buffercheck
+
+import android.content.Context
+import android.content.SharedPreferences
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Toast
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.activityViewModels
+import androidx.lifecycle.MutableLiveData
+import com.example.hpostesting.data.DataHolder
+import com.example.hpostesting.data.constant.Constants
+import com.example.hpostesting.data.constant.HemoCubeCommands
+import com.example.hpostesting.data.model.patient.DeviceData
+import com.example.hpostesting.data.model.patient.toHemoCubeTestData
+import com.example.hpostesting.presentation.UsbServiceListener
+import com.example.hpostesting.presentation.hemocube.HemoCubeViewModel
+import com.example.hpostesting.presentation.utils.MyDialogListener
+import com.example.hpostesting.presentation.utils.UIUtils
+import com.google.firebase.crashlytics.ktx.crashlytics
+import com.google.firebase.ktx.Firebase
+import `in`.sminnovations.hpostesting.R
+import `in`.sminnovations.hpostesting.databinding.FragmentHemoCubeReferenceBinding
+import kotlin.math.log10
+
+class HemoCubeBufferCheckFragment : Fragment() {
+
+    private lateinit var binding: FragmentHemoCubeReferenceBinding
+    private val hemoCubeViewModel: HemoCubeViewModel by activityViewModels()
+    private lateinit var sharedPreferences: SharedPreferences
+    private var currentDeviceData: DeviceData? = null
+    private var resultData: String = ""
+    private val messages = MutableLiveData<String>()
+    private var isTestOngoing = false
+    private var startListening = MutableLiveData(false)
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?,
+    ): View {
+        binding = FragmentHemoCubeReferenceBinding.inflate(inflater, container, false)
+        sharedPreferences =
+            requireContext().getSharedPreferences("PREFERENCE_NAME", Context.MODE_PRIVATE)
+        return binding.root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        initViews()
+        observeViewModel()
+    }
+
+    private fun initViews() {
+        binding.btnKit.visibility = View.GONE
+        binding.btnSubmit.visibility = View.GONE
+        binding.etBloodGroup.visibility = View.GONE
+        listenToHemoCube()
+        startBufferProcess()
+    }
+
+    private fun observeViewModel() {
+
+        hemoCubeViewModel.deviceData.observe(viewLifecycleOwner) {
+            currentDeviceData = it
+        }
+
+        hemoCubeViewModel.networkStatusLiveData.observe(viewLifecycleOwner) { isNetworkAvailable ->
+            if (isNetworkAvailable) {
+                hemoCubeViewModel.getDeviceData(sharedPreferences.getString(Constants.USER_ID, ""))
+            } else {
+                Toast.makeText(
+                    requireContext(),
+                    "No internet connection avaiable",
+                    Toast.LENGTH_SHORT
+                ).show()
+            }
+        }
+
+        messages.observe(viewLifecycleOwner) {
+            binding.tvSubtitle4.text = it
+        }
+    }
+
+    private fun listenToHemoCube() {
+        if (DataHolder.hemoCubeTestData == null) {
+            DataHolder.hemoCubeTestData = DataHolder.selectedTest?.toHemoCubeTestData()
+        }
+
+        val fullReadOutput = StringBuilder()
+        startListening.postValue(true)
+
+        try {
+            (activity as HemocubeBufferCheckActivity).mService.listenToHemoCube(object :
+                UsbServiceListener {
+                override fun onUsbRead(data: ByteArray?) {
+                    data?.let {
+                        val stringData = String(it)
+                        fullReadOutput.append(stringData)
+                        handleUsbData(stringData, fullReadOutput)
+                    }
+                }
+
+                override fun onUsbError(e: Exception?) {
+                }
+            })
+        } catch (e: Exception) {
+            showToast("test is going on")
+            Firebase.crashlytics.recordException(e)
+        }
+    }
+
+    private fun handleUsbData(stringData: String, fullReadOutput: StringBuilder) {
+        if (stringData.contains("#")) {
+            messages.postValue(stringData)
+            isTestOngoing = true
+        }
+
+        resultData += fullReadOutput.toString()
+
+        when {
+            stringData.contains("ERROR 500") -> showError500Dialog()
+            stringData.contains("ERROR 501") -> showError501Dialog()
+            stringData.contains("#Buffer Completed") -> showStartSampleDialog()
+            stringData.contains("#Sample Completed") -> fetchResult()
+
+            stringData.contains("RESULT") || resultData.contains("REND") -> {
+                var validString: String
+                val results: List<String>
+                if (stringData.contains("RESULT")) {
+                    validString = isValidResult(stringData)
+                    if (validString.isEmpty()) {
+                        results = resultData.split("\n")
+                        validString = parseResult(results)
+                    }
+                } else {
+                    results = resultData.split("\n")
+                    validString = parseResult(results)
+                }
+                if (validString.isNotEmpty()) {
+                    handleValidResult(validString)
+                }
+            }
+        }
+    }
+
+
+    private fun showError500Dialog() {
+        UIUtils.createAlertDialog(requireContext(),
+            "BUFFER ERROR",
+            "Do you want to continue with existing buffer?",
+            getString(R.string.noo),
+            "Yes",
+            object : MyDialogListener {
+                override fun onClickNegativeButton() {}
+
+                override fun onClickPositiveButton() {
+                    listenToHemoCube()
+                    startBufferProcess()
+                }
+            })
+    }
+
+
+    private fun showError501Dialog() {
+        UIUtils.createAlertDialog(requireContext(),
+            "SAMPLE ERROR",
+            "Do you want to continue with Sample?",
+            getString(R.string.noo),
+            "Yes",
+            object : MyDialogListener {
+                override fun onClickNegativeButton() {}
+
+                override fun onClickPositiveButton() {
+                    listenToHemoCube()
+                    startSampleProcess()
+                }
+            })
+    }
+
+    private fun showStartSampleDialog() {
+        activity?.runOnUiThread {
+            UIUtils.createAlertDialog(requireContext(),
+                "Start Sample",
+                "Do you want to start sample reading?",
+                getString(R.string.no),
+                "Yes",
+                object : MyDialogListener {
+                    override fun onClickNegativeButton() {}
+
+                    override fun onClickPositiveButton() {
+                        listenToHemoCube()
+                        startSampleProcess()
+                    }
+                })
+        }
+    }
+
+    private fun handleValidResult(validString: String) {
+        try {
+            val result = validString.split(" ")
+            if (result.size == 8) {
+                val led1BufferForDevice = result[3].toDoubleOrNull()
+                val led2BufferForDevice = result[4].toDoubleOrNull()
+                val led1Sample = result[5].toDoubleOrNull()
+                val led2Sample = result[6].toDoubleOrNull()
+                val led1Average = log10(led1BufferForDevice?.div(led1Sample!!) ?: 0.0)
+                val led2Average = log10(led2BufferForDevice?.div(led2Sample!!) ?: 0.0)
+                val deviceRatio = led1Average / led2Average
+                val calculatedRatio = calculateRatio(deviceRatio)
+                val classificationResult = findResult(calculatedRatio)
+                messages.postValue(classificationResult)
+            }
+        } catch (e: Exception) {
+            Toast.makeText(
+                requireContext(), "Error while processing device data", Toast.LENGTH_SHORT
+            ).show()
+            Firebase.crashlytics.recordException(e)
+        }
+    }
+
+    private fun findResult(calculatedRatio: Double?): String {
+        try {
+            if (calculatedRatio != null) {
+                if (calculatedRatio < 0.085) return "Kit Failed"
+                if (calculatedRatio in 0.085..0.155) return "Kit Passed"
+                if (calculatedRatio in 0.155..0.175) return "Kit Failed"
+                if (calculatedRatio in 0.175..0.22) return "Kit Failed"
+                if (calculatedRatio in 0.22..0.25) return "Kit Failed"
+                if (calculatedRatio in 0.25..0.35) return "Kit Failed"
+                if (calculatedRatio > 0.35) return "Kit Failed"
+            } else {
+                return "NULL"
+            }
+        } catch (e: Exception) {
+            showToast("error while performing classification")
+            Firebase.crashlytics.recordException(e)
+            return "ERROR"
+        }
+        return "NULL"
+    }
+
+    private fun showToast(message: String) {
+        Toast.makeText(requireContext(), message, Toast.LENGTH_SHORT).show()
+    }
+
+    private fun startBufferProcess() {
+
+        (activity as HemocubeBufferCheckActivity).mService.sendAndListenToHemoCube(
+            HemoCubeCommands.startBuffer,
+            object : UsbServiceListener {
+                override fun onUsbRead(data: ByteArray?) {}
+
+                override fun onUsbError(e: Exception?) {
+                }
+            })
+    }
+
+    private fun startSampleProcess() {
+
+        (activity as HemocubeBufferCheckActivity).mService.sendAndListenToHemoCube(
+            HemoCubeCommands.startSample,
+            object : UsbServiceListener {
+                override fun onUsbRead(data: ByteArray?) {}
+
+                override fun onUsbError(e: Exception?) {
+                }
+            })
+    }
+
+    private fun fetchResult() {
+
+        (activity as HemocubeBufferCheckActivity).mService.sendAndListenToHemoCube(
+            HemoCubeCommands.getSample,
+            object : UsbServiceListener {
+                override fun onUsbRead(data: ByteArray?) {}
+
+                override fun onUsbError(e: Exception?) {
+                }
+            })
+    }
+
+    private fun calculateRatio(ratio: Double): Double {
+        val coefficient1 = currentDeviceData?.coefficients?.get(0) ?: 0.0
+        val coefficient2 = currentDeviceData?.coefficients?.get(1) ?: 1.0
+        return coefficient1 * ratio + coefficient2
+    }
+
+    private fun parseResult(frames: List<String>): String {
+        val lines = mutableListOf<String>()
+        for (frame in frames.reversed()) {
+            if (frame.contains("REND") || frame.contains("RESULT")) lines += frame
+            if (frame.contains("RESULT")) {
+                break
+            }
+        }
+        val line = lines.reversed().joinToString("").trim()
+        if (line.contains("RESULT") && line.split(" ").size == 8) {
+            return line
+        }
+        return ""
+    }
+
+    private fun isValidResult(line: String): String {
+        return if (line.contains("RESULT") && line.split(" ").size == 8) {
+            line
+        } else {
+            ""
+        }
+    }
+}
diff --git a/app/src/main/java/com/example/hpostesting/presentation/buffercheck/HemocubeBufferCheckActivity.kt b/app/src/main/java/com/example/hpostesting/presentation/buffercheck/HemocubeBufferCheckActivity.kt
new file mode 100644
index 0000000..6375d39
--- /dev/null
+++ b/app/src/main/java/com/example/hpostesting/presentation/buffercheck/HemocubeBufferCheckActivity.kt
@@ -0,0 +1,164 @@
+package com.example.hpostesting.presentation.buffercheck
+
+import android.app.PendingIntent
+import android.content.BroadcastReceiver
+import android.content.ComponentName
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.content.ServiceConnection
+import android.hardware.usb.UsbDevice
+import android.hardware.usb.UsbDeviceConnection
+import android.hardware.usb.UsbManager
+import android.os.Bundle
+import android.os.IBinder
+import android.util.Log
+import android.view.Menu
+import android.widget.Toast
+import androidx.activity.viewModels
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
+import androidx.core.view.get
+import com.example.hpostesting.data.DataHolder
+import com.example.hpostesting.data.constant.Constants
+import com.example.hpostesting.presentation.hemocube.HemoCubeViewModel
+import com.example.hpostesting.presentation.testRight.UsbService
+import com.hoho.android.usbserial.driver.UsbSerialDriver
+import com.hoho.android.usbserial.driver.UsbSerialProber
+import dagger.hilt.android.AndroidEntryPoint
+import `in`.sminnovations.hpostesting.R
+import `in`.sminnovations.hpostesting.databinding.ActivityHemocubeBinding
+
+@AndroidEntryPoint
+open class HemocubeBufferCheckActivity : AppCompatActivity() {
+    private lateinit var binding: ActivityHemocubeBinding
+    private val viewModel by viewModels<HemoCubeViewModel>()
+    private var myMenu: Menu? = null
+
+    private lateinit var mDriver: UsbSerialDriver
+    private var mConnection: UsbDeviceConnection? = null
+    lateinit var mService: UsbService
+
+    private val TAG = "HemoCube"
+
+    private val broadcastReceiver = object : BroadcastReceiver() {
+        override fun onReceive(context: Context, intent: Intent) {
+
+            synchronized(this) {
+                val device: UsbDevice? = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE)
+
+                if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
+                    device?.apply {
+                        connectUsb(true)
+                        DataHolder.usbConnected.postValue(true)
+                    }
+                } else {
+                    DataHolder.usbConnected.postValue(true)
+                }
+            }
+
+        }
+    }
+    private val connection = object : ServiceConnection {
+        override fun onServiceConnected(className: ComponentName, service: IBinder) {
+            val binder = service as UsbService.UsbServiceBinder
+            mService = binder.getService()
+            viewModel.isServiceConnected = true
+            mConnection.let { mService.connect(mDriver, mConnection!!) }
+            moveToNext()
+        }
+
+        override fun onServiceDisconnected(arg0: ComponentName) {
+            viewModel.isServiceConnected = false
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = ActivityHemocubeBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+        setSupportActionBar(binding.myToolbar)
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+        setupListener()
+        connectUsb(false)
+    }
+
+    private fun setupListener() {
+        DataHolder.usbConnected.observe(this) {
+            Log.d("USB OBSERVE", "HemoCube called -> $it")
+            if (it) {
+                myMenu?.get(0)?.icon =
+                    ContextCompat.getDrawable(this, R.drawable.ic_baseline_usb_24)
+            } else {
+                myMenu?.get(0)?.icon =
+                    ContextCompat.getDrawable(this, R.drawable.ic_baseline_usb_off_24)
+                Toast.makeText(this, "Device is Disconnected", Toast.LENGTH_SHORT).show()
+            }
+        }
+    }
+
+    open fun connectUsb(permissionGranted: Boolean) {
+        Log.d(TAG, "connectUsb() called, permission variable = $permissionGranted")
+        val manager = getSystemService(Context.USB_SERVICE) as UsbManager
+        val availableDrivers = UsbSerialProber.getDefaultProber().findAllDrivers(manager)
+
+        if (availableDrivers.isEmpty()) {
+            Toast.makeText(this, "No device found", Toast.LENGTH_SHORT).show()
+        } else {
+            mDriver = availableDrivers[0]
+            mConnection = manager.openDevice(mDriver.device)
+
+            if (mConnection == null) {
+                requestUserPermission(manager, mDriver.device)
+            } else {
+                setupService()
+            }
+        }
+    }
+
+
+    private fun requestUserPermission(manager: UsbManager, device: UsbDevice) {
+        val mPendingIntent: PendingIntent = if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S) {
+            PendingIntent.getBroadcast(
+                this, 0, Intent(Constants.HOMOCUBE_USB_PERMISSION), PendingIntent.FLAG_MUTABLE
+            )
+        } else {
+            PendingIntent.getBroadcast(
+                this,
+                0,
+                Intent(Constants.HOMOCUBE_USB_PERMISSION),
+                PendingIntent.FLAG_ONE_SHOT or PendingIntent.FLAG_IMMUTABLE
+            )
+        }
+
+        val filter = IntentFilter(Constants.HOMOCUBE_USB_PERMISSION)
+        registerReceiver(broadcastReceiver, filter)
+        manager.requestPermission(device, mPendingIntent)
+    }
+
+    private fun setupService() {
+        val intent = Intent(this, UsbService::class.java)
+        bindService(intent, connection, Context.BIND_AUTO_CREATE)
+    }
+
+    private fun moveToNext() {
+        if (supportFragmentManager.isDestroyed) return
+
+        supportFragmentManager.beginTransaction().replace(binding.fghemocube.id, HemoCubeBufferCheckFragment())
+            .commit()
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+        menuInflater.inflate(R.menu.my_menu, menu)
+        return true
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        if (viewModel.isServiceConnected) {
+            mService.disconnect()
+            unbindService(connection)
+            viewModel.isServiceConnected = false
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/hpostesting/presentation/dashboard/GalleryFragment.kt b/app/src/main/java/com/example/hpostesting/presentation/dashboard/GalleryFragment.kt
index 1911ca0..9307d1b 100644
--- a/app/src/main/java/com/example/hpostesting/presentation/dashboard/GalleryFragment.kt
+++ b/app/src/main/java/com/example/hpostesting/presentation/dashboard/GalleryFragment.kt
@@ -1,12 +1,12 @@
 package com.example.hpostesting.presentation.dashboard
 
+import android.content.Intent
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.fragment.app.Fragment
-import androidx.lifecycle.ViewModelProvider
-//import com.example.hpostesting.presentation.dashboard.ui.gallery.GalleryViewModel
+import com.example.hpostesting.presentation.buffercheck.HemocubeBufferCheckActivity
 import `in`.sminnovations.hpostesting.databinding.FragmentGalleryBinding
 
 class GalleryFragment : Fragment() {
@@ -32,6 +32,9 @@ class GalleryFragment : Fragment() {
 //        galleryViewModel.text.observe(viewLifecycleOwner) {
 ////            textView.text = it
 //        }
+        binding.btnSubmit.setOnClickListener {
+            startActivity(Intent(requireContext(), HemocubeBufferCheckActivity::class.java))
+        }
         return root
     }
 
diff --git a/app/src/main/res/layout/fragment_gallery.xml b/app/src/main/res/layout/fragment_gallery.xml
index 2a4b95d..6f43343 100644
--- a/app/src/main/res/layout/fragment_gallery.xml
+++ b/app/src/main/res/layout/fragment_gallery.xml
@@ -4,19 +4,21 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".presentation.dashboard.GalleryFragment">
+    tools:context="com.example.hpostesting.presentation.dashboard.GalleryFragment">
 
-    <TextView
-        android:id="@+id/text_gallery"
-        style="@style/title1"
-        android:layout_width="match_parent"
+    <Button
+        android:id="@+id/btn_submit"
+        android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_margin="24dp"
-        android:textAlignment="center"
-        android:textSize="20sp"
-        android:text="@string/to_be_launched_in_next_version_of_the_app"
+        android:layout_marginHorizontal="16dp"
+        android:layout_marginTop="24dp"
+        android:clickable="false"
+        android:text="@string/check_buffer"
+        android:textColor="@color/white"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
+
+
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 15023b1..5ec2c82 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -193,5 +193,6 @@
     <string name="select_blood_group">Select Blood Group</string>
     <string name="all_registered_user_are_tested_successfully">All registered user are tested successfully</string>
     <string name="start_incubation">Start Incubation</string>
+    <string name="check_buffer">Check Buffer</string>
 
 </resources>
\ No newline at end of file