diff --git a/app/build.gradle b/app/build.gradle
index 965e828..265aec1 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -10,7 +10,7 @@ android {
         minSdk 28
         targetSdk 32
         versionCode 1
-        versionName "1.3.3"
+        versionName "1.3.4-SNAPSHOT"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
diff --git a/app/src/main/java/de/cmtjk/linkupconnect/LinkUpConnectService.java b/app/src/main/java/de/cmtjk/linkupconnect/LinkUpConnectService.java
index b80f004..2019521 100644
--- a/app/src/main/java/de/cmtjk/linkupconnect/LinkUpConnectService.java
+++ b/app/src/main/java/de/cmtjk/linkupconnect/LinkUpConnectService.java
@@ -67,6 +67,23 @@ private void sendToActivitiesLogView(String message) {
         LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intent);
     }
 
+    private void showAlert(String message) {
+        Intent intent = new Intent(LOCAL_BROADCAST);
+        intent.putExtra("ALERT", message);
+        LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intent);
+    }
+
+    private void showSetUpAlert()  {
+        showAlert("No valid data received.\n\n" +
+                "Do you have connected your app?\n" +
+                "Libre 3/LibreLink ➡ Connected Apps ➡ LibreLinkUp\n\n" +
+                "Do you have accepted your connection in LibreLinkUp app?\n" +
+                "LibreLinkUp ➡ accept connection\n\n" +
+                "Do you have accepted the TOS?\n" +
+                "Libre 3/LibreLink ➡ accept TOS\n\n" +
+                "If you just set up your connection please wait a moment.");
+    }
+
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
         setUpNotification();
@@ -183,6 +200,7 @@ private void handleGraphResponse(JSONObject response, boolean xDripEnabled, bool
 
         } catch (JSONException e) {
             sendToActivitiesLogView("Getting measurement failed: " + e.getMessage());
+            showSetUpAlert();
         }
     }
 
@@ -336,6 +354,7 @@ private void handleConnectionResponse(JSONObject response, RequestQueue queue, S
             queue.add(graphRequest);
         } catch (JSONException e) {
             sendToActivitiesLogView("Getting connections failed: " + e.getMessage());
+            showSetUpAlert();
         }
     }
 
diff --git a/app/src/main/java/de/cmtjk/linkupconnect/MainActivity.java b/app/src/main/java/de/cmtjk/linkupconnect/MainActivity.java
index 3041169..c651118 100644
--- a/app/src/main/java/de/cmtjk/linkupconnect/MainActivity.java
+++ b/app/src/main/java/de/cmtjk/linkupconnect/MainActivity.java
@@ -156,21 +156,42 @@ private void configureLocalBroadcaster(TextView logTextView, ScrollView logScrol
                 new BroadcastReceiver() {
                     @Override
                     public void onReceive(Context context, Intent intent) {
-                        if (debugEnabled()) {
+                        if (debugEnabled() && isLogMessage(intent)) {
                             logTextView.append("[" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("HH:mm:ss")) + "] ");
                             logTextView.append(intent.getStringExtra("LOG"));
                             logTextView.append("\n");
                             logScrollView.fullScroll(ScrollView.FOCUS_DOWN);
                         }
-                    }
 
+                        if (isAlert(intent)) {
+                            showAlert(intent.getStringExtra("ALERT"));
+                        }
+
+                    }
                     private boolean debugEnabled() {
                         return ((CheckBox) findViewById(R.id.debug)).isChecked();
                     }
+
+                    private boolean isLogMessage(Intent intent) {
+                        return intent.getStringExtra("LOG") != null && !intent.getStringExtra("LOG").isEmpty();
+                    }
+
+                    private boolean isAlert(Intent intent) {
+                        return intent.getStringExtra("ALERT") != null && !intent.getStringExtra("ALERT").isEmpty();
+                    }
                 }, new IntentFilter(LinkUpConnectService.LOCAL_BROADCAST)
         );
     }
 
+    private void showAlert(String message) {
+        AlertDialog.Builder builder = new AlertDialog.Builder(this);
+        builder.setTitle("ℹ️ Information")
+                .setMessage(message)
+                .setPositiveButton("Ok", (dialog, id) -> {});
+        AlertDialog dialog = builder.create();
+        dialog.show();
+    }
+
     private void configureDebugCheckBox(TextView logTextView) {
         CheckBox debugCheckBox = findViewById(R.id.debug);
         debugCheckBox.setOnCheckedChangeListener((compoundButton, checked) -> {