diff --git a/app/src/main/java/info/nightscout/androidaps/MainActivity.java b/app/src/main/java/info/nightscout/androidaps/MainActivity.java
index ba6908a2dd..13309fb56c 100644
--- a/app/src/main/java/info/nightscout/androidaps/MainActivity.java
+++ b/app/src/main/java/info/nightscout/androidaps/MainActivity.java
@@ -400,6 +400,8 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
                                     builder.setIcon(R.mipmap.blueowl);
                                 String message = "Build: " + BuildConfig.BUILDVERSION + "\n";
                                 message += MainApp.sResources.getString(R.string.configbuilder_nightscoutversion_label) + " " + ConfigBuilderPlugin.nightscoutVersionName;
+                                if (MainApp.engineeringMode)
+                                    message += MainApp.gs(R.string.engineering_mode_enabled);
                                 builder.setMessage(message);
                                 builder.setPositiveButton(MainApp.sResources.getString(R.string.ok), null);
                                 AlertDialog alertDialog = builder.create();
diff --git a/app/src/main/java/info/nightscout/androidaps/MainApp.java b/app/src/main/java/info/nightscout/androidaps/MainApp.java
index 2069ea557b..7db2bbb739 100644
--- a/app/src/main/java/info/nightscout/androidaps/MainApp.java
+++ b/app/src/main/java/info/nightscout/androidaps/MainApp.java
@@ -20,6 +20,7 @@ import net.danlew.android.joda.JodaTimeAndroid;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.File;
 import java.util.ArrayList;
 
 import info.nightscout.androidaps.Services.Intents;
@@ -46,6 +47,8 @@ import info.nightscout.androidaps.plugins.OpenAPSAMA.OpenAPSAMAPlugin;
 import info.nightscout.androidaps.plugins.OpenAPSMA.OpenAPSMAPlugin;
 import info.nightscout.androidaps.plugins.OpenAPSSMB.OpenAPSSMBPlugin;
 import info.nightscout.androidaps.plugins.Overview.OverviewPlugin;
+import info.nightscout.androidaps.plugins.Overview.events.EventNewNotification;
+import info.nightscout.androidaps.plugins.Overview.notifications.Notification;
 import info.nightscout.androidaps.plugins.Persistentnotification.PersistentNotificationPlugin;
 import info.nightscout.androidaps.plugins.ProfileLocal.LocalProfilePlugin;
 import info.nightscout.androidaps.plugins.ProfileNS.NSProfilePlugin;
@@ -95,6 +98,9 @@ public class MainApp extends Application {
     private static AckAlarmReceiver ackAlarmReciever = new AckAlarmReceiver();
     private LocalBroadcastManager lbm;
 
+    public static boolean devBranch;
+    public static boolean engineeringMode;
+
     @Override
     public void onCreate() {
         super.onCreate();
@@ -139,7 +145,7 @@ public class MainApp extends Application {
             if (Config.DANAR) pluginsList.add(DanaRv2Plugin.getPlugin());
             if (Config.DANAR) pluginsList.add(DanaRSPlugin.getPlugin());
             pluginsList.add(CareportalPlugin.getPlugin());
-            // if (Config.DANAR) pluginsList.add(InsightPumpPlugin.getPlugin()); // <-- Enable Insight plugin here
+            if (Config.DANAR && engineeringMode) pluginsList.add(InsightPumpPlugin.getPlugin()); // <-- Enable Insight plugin here
             if (Config.MDI) pluginsList.add(MDIPlugin.getPlugin());
             if (Config.VIRTUALPUMP) pluginsList.add(VirtualPumpPlugin.getPlugin());
             if (Config.APS) pluginsList.add(LoopPlugin.getPlugin());
@@ -195,6 +201,13 @@ public class MainApp extends Application {
             }
         }).start();
 
+        engineeringMode = new File(System.getProperty("EXT_FILES_DIR"),"engineering_mode").canRead();
+        devBranch = BuildConfig.VERSION.contains("dev");
+
+        if (devBranch && !engineeringMode) {
+            Notification n = new Notification(Notification.TOAST_ALARM, gs(R.string.closed_loop_disabled_on_dev_branch), Notification.NORMAL);
+            bus().post(new EventNewNotification(n));
+        }
     }
 
     private void registerLocalBroadcastReceiver() {
diff --git a/app/src/main/java/info/nightscout/androidaps/plugins/ConstraintsSafety/SafetyPlugin.java b/app/src/main/java/info/nightscout/androidaps/plugins/ConstraintsSafety/SafetyPlugin.java
index ef30a0ebb9..37000f345c 100644
--- a/app/src/main/java/info/nightscout/androidaps/plugins/ConstraintsSafety/SafetyPlugin.java
+++ b/app/src/main/java/info/nightscout/androidaps/plugins/ConstraintsSafety/SafetyPlugin.java
@@ -102,6 +102,7 @@ public class SafetyPlugin implements PluginBase, ConstraintsInterface {
      **/
     @Override
     public boolean isClosedModeEnabled() {
+        if (MainApp.devBranch && !MainApp.engineeringMode) return false;
         String mode = SP.getString("aps_mode", "open");
         return mode.equals("closed") && BuildConfig.CLOSEDLOOP;
     }
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 7cd12ea540..7097b5879d 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -971,6 +971,7 @@
     <string name="fabric_upload">Fabric Upload</string>
     <string name="allow_automated_crash_reporting">Allow automated crash reporting and feature usage data to be sent to the developers via the fabric.io service.</string>
     <string name="g5appnotdetected">Please update your G5 app to supported version</string>
+
     <string name="suspendloopfor30min">Suspend for 30 min</string>
     <string name="start_activity_tt">Start Activity TT</string>
     <string name="start_eating_soon_tt">Start Eating soon TT</string>
@@ -981,5 +982,7 @@
     <string name="bolusrecordedonly">Bolus will be recorded only</string>
     <string name="ns_autobackfill">Autobackfill missig BGs from NS</string>
     <string name="key_ns_autobackfill" translatable="false">ns_autobackfill</string>
+    <string name="closed_loop_disabled_on_dev_branch">Running dev version. Closed loop is disabled</string>
+    <string name="engineering_mode_enabled">Engineering mode enabled</string>
 </resources>