diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 710ee85e4e..e09f297a7b 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1549,10 +1549,6 @@
     <string name="rileylink_scanner_scan_stop">STOP</string>
     <string name="rileylink_scanner_selected_device">Selected</string>
     <string name="rileylink_scanner_title">RileyLink Scan</string>
-    <string name="rileylink_scanner_ble_not_supported">Bluetooth Low Energy not supported.</string>
-    <string name="rileylink_scanner_ble_not_enabled">Bluetooth not enabled.</string>
-    <string name="location_not_found_title">Location Is Not Enabled</string>
-    <string name="location_not_found_message">For Bluetooth discovery to work on newer devices, location must be enabled. AAPS does not track your location and it can be disabled after pairing is successful.</string>
     <string name="location_yes">Enable</string>
     <string name="location_no">No</string>
     <string name="rileylink_scanner_scanning">Scanning</string>
diff --git a/core/build.gradle b/core/build.gradle
index 0a6122fa64..55829c53d1 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -42,7 +42,7 @@ dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     implementation 'androidx.appcompat:appcompat:1.1.0'
-    implementation 'androidx.core:core-ktx:1.2.0'
+    implementation "androidx.preference:preference-ktx:1.1.1"
 
     implementation "com.google.dagger:dagger-android:$dagger_version"
     implementation "com.google.dagger:dagger-android-support:$dagger_version"
diff --git a/core/src/main/AndroidManifest.xml b/core/src/main/AndroidManifest.xml
index 46d6d492d4..0ff2fcd7b8 100644
--- a/core/src/main/AndroidManifest.xml
+++ b/core/src/main/AndroidManifest.xml
@@ -1,2 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="info.nightscout.androidaps.core" />
+    package="info.nightscout.androidaps.core" >
+
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+</manifest>
diff --git a/core/src/main/java/info/nightscout/androidaps/plugins/pump/common/ble/BlePreCheck.kt b/core/src/main/java/info/nightscout/androidaps/plugins/pump/common/ble/BlePreCheck.kt
new file mode 100644
index 0000000000..497ec61fbc
--- /dev/null
+++ b/core/src/main/java/info/nightscout/androidaps/plugins/pump/common/ble/BlePreCheck.kt
@@ -0,0 +1,87 @@
+package info.nightscout.androidaps.plugins.pump.common.ble
+
+import android.Manifest
+import android.bluetooth.BluetoothAdapter
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.location.LocationManager
+import android.provider.Settings
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.app.ActivityCompat
+import androidx.core.content.ContextCompat
+import info.nightscout.androidaps.core.R
+import info.nightscout.androidaps.utils.alertDialogs.OKDialog
+import info.nightscout.androidaps.utils.resources.ResourceHelper
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class BlePreCheck @Inject constructor(
+    val resourceHelper: ResourceHelper
+) {
+
+    companion object {
+        private const val PERMISSION_REQUEST_COARSE_LOCATION = 30241 // arbitrary.
+    }
+
+    fun prerequisitesCheck(activity: AppCompatActivity): Boolean {
+        if (!activity.packageManager.hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
+            OKDialog.show(activity, resourceHelper.gs(R.string.message), resourceHelper.gs(R.string.rileylink_scanner_ble_not_supported))
+            return false
+        } else {
+            // Use this check to determine whether BLE is supported on the device. Then
+            // you can selectively disable BLE-related features.
+            if (ContextCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
+                // your code that requires permission
+                ActivityCompat.requestPermissions(activity, arrayOf(Manifest.permission.ACCESS_COARSE_LOCATION), PERMISSION_REQUEST_COARSE_LOCATION)
+            }
+
+            val bluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
+            // Ensures Bluetooth is available on the device and it is enabled. If not,
+            // displays a dialog requesting user permission to enable Bluetooth.
+            if (bluetoothAdapter == null || !bluetoothAdapter.isEnabled) {
+                OKDialog.show(activity, resourceHelper.gs(R.string.message), resourceHelper.gs(R.string.rileylink_scanner_ble_not_enabled))
+                return false
+            } else {
+                // Will request that GPS be enabled for devices running Marshmallow or newer.
+                if (!isLocationEnabled(activity)) {
+                    requestLocation(activity)
+                    return false
+                }
+            }
+        }
+        return true
+    }
+
+    /**
+     * Determine if GPS is currently enabled.
+     *
+     *
+     * On Android 6 (Marshmallow), location needs to be enabled for Bluetooth discovery to work.
+     *
+     * @param context The current app context.
+     * @return true if location is enabled, false otherwise.
+     */
+    private fun isLocationEnabled(context: Context): Boolean {
+        val locationManager = context.getSystemService(Context.LOCATION_SERVICE) as LocationManager
+        return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) ||
+            locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)
+    }
+
+    /**
+     * Prompt the user to enable GPS location if it isn't already on.
+     *
+     * @param activity The currently visible activity.
+     */
+    private fun requestLocation(activity: AppCompatActivity) {
+        if (isLocationEnabled(activity)) {
+            return
+        }
+
+        // Shamelessly borrowed from http://stackoverflow.com/a/10311877/868533
+        OKDialog.showConfirmation(activity, resourceHelper.gs(R.string.location_not_found_title), resourceHelper.gs(R.string.location_not_found_message), Runnable {
+            activity.startActivity(Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS))
+        })
+    }
+}
\ No newline at end of file
diff --git a/core/src/main/res/values/strings.xml b/core/src/main/res/values/strings.xml
index b89cf096bd..a0d615ea71 100644
--- a/core/src/main/res/values/strings.xml
+++ b/core/src/main/res/values/strings.xml
@@ -7,4 +7,9 @@
     <string name="cancel">Cancel</string>
     <string name="dismiss">DISMISS</string>
 
+    <string name="rileylink_scanner_ble_not_supported">Bluetooth Low Energy not supported.</string>
+    <string name="rileylink_scanner_ble_not_enabled">Bluetooth not enabled.</string>
+    <string name="location_not_found_title">Location Is Not Enabled</string>
+    <string name="location_not_found_message">For Bluetooth discovery to work on newer devices, location must be enabled. AAPS does not track your location and it can be disabled after pairing is successful.</string>
+
 </resources>
\ No newline at end of file