diff --git a/testapps/TestSatelliteApp/AndroidManifest.xml b/testapps/TestSatelliteApp/AndroidManifest.xml
index 40954b4..4a6076b 100644
--- a/testapps/TestSatelliteApp/AndroidManifest.xml
+++ b/testapps/TestSatelliteApp/AndroidManifest.xml
@@ -44,5 +44,6 @@
         <activity android:name=".Datagram" />
         <activity android:name=".Provisioning" />
         <activity android:name=".MultipleSendReceive" />
+        <activity android:name=".SendReceive" />
     </application>
 </manifest>
diff --git a/testapps/TestSatelliteApp/res/layout/activity_SatelliteTestApp.xml b/testapps/TestSatelliteApp/res/layout/activity_SatelliteTestApp.xml
index 2ed4a24..d32916f 100644
--- a/testapps/TestSatelliteApp/res/layout/activity_SatelliteTestApp.xml
+++ b/testapps/TestSatelliteApp/res/layout/activity_SatelliteTestApp.xml
@@ -57,6 +57,12 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:paddingRight="4dp"
-            android:text="@string/SatelliteModemState"/>
+            android:text="@string/MultipleSendReceive"/>
+        <Button
+             android:id="@+id/SendReceive"
+             android:layout_width="match_parent"
+             android:layout_height="wrap_content"
+             android:paddingRight="4dp"
+             android:text="@string/SendReceive"/>
     </LinearLayout>
 </LinearLayout>
diff --git a/testapps/TestSatelliteApp/res/layout/activity_SendReceive.xml b/testapps/TestSatelliteApp/res/layout/activity_SendReceive.xml
new file mode 100644
index 0000000..6490e5d
--- /dev/null
+++ b/testapps/TestSatelliteApp/res/layout/activity_SendReceive.xml
@@ -0,0 +1,97 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2023 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License
+  -->
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:gravity="center"
+    android:paddingLeft="4dp">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical" >
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content" android:layout_weight="0"
+            android:textColor="@android:color/holo_blue_dark"
+            android:textSize="20dp"
+            android:text="Send and Receive APIs"/>
+        <Button
+            android:id="@+id/sendMessage"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingRight="4dp"
+            android:text="@string/sendMessage"/>
+        <Button
+            android:id="@+id/receiveMessage"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingRight="4dp"
+            android:text="@string/receiveMessage"/>
+        <EditText
+            android:id="@+id/enterText"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:hint="Enter message to send"
+            android:inputType="text" />
+        <Button
+            android:id="@+id/Back"
+            android:onClick="Back"
+            android:textColor="@android:color/holo_blue_dark"
+            android:layout_marginTop="100dp"
+            android:layout_gravity="center"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:paddingRight="4dp"
+            android:text="@string/Back"/>
+        <TextView
+            android:id="@+id/showErrorStatus"
+            android:layout_width="400dp"
+            android:layout_height="50dp"
+            android:capitalize="characters"
+            android:textColor="@android:color/holo_blue_light"
+            android:textSize="15dp" />
+        <TextView
+            android:id="@+id/devicePosition"
+            android:layout_width="400dp"
+            android:layout_height="65dp"
+            android:capitalize="characters"
+            android:textColor="@android:color/holo_blue_light"
+            android:layout_centerVertical="true"
+            android:textSize="15dp" />
+        <TextView
+            android:id="@+id/satellitePosition"
+            android:layout_width="400dp"
+            android:layout_height="65dp"
+            android:capitalize="characters"
+            android:textColor="@android:color/holo_blue_light"
+            android:layout_centerVertical="true"
+            android:textSize="15dp" />
+        <TextView
+            android:id="@+id/messageStatus"
+            android:layout_width="400dp"
+            android:layout_height="65dp"
+            android:capitalize="characters"
+            android:textColor="@android:color/holo_blue_light"
+            android:layout_centerVertical="true"
+            android:textSize="15dp" />
+    </LinearLayout>
+</LinearLayout>
diff --git a/testapps/TestSatelliteApp/res/values/donottranslate_strings.xml b/testapps/TestSatelliteApp/res/values/donottranslate_strings.xml
index 8585102..f2c1f57 100644
--- a/testapps/TestSatelliteApp/res/values/donottranslate_strings.xml
+++ b/testapps/TestSatelliteApp/res/values/donottranslate_strings.xml
@@ -19,7 +19,8 @@
     <string name="SatelliteControl">SatelliteControl APIs</string>
     <string name="Datagram">Datagram APIs</string>
     <string name="Provisioning">Provisioning APIs</string>
-    <string name="SatelliteModemState">SatelliteModemState APIs</string>
+    <string name="MultipleSendReceive">Test multiple poll and send</string>
+    <string name="SendReceive">Send and Receive datagrams</string>
 
     <string name="enableSatellite">enableSatellite</string>
     <string name="disableSatellite">disableSatellite</string>
@@ -53,5 +54,8 @@
     <string name="multipleSendSatelliteDatagram">multipleSendSatelliteDatagram</string>
     <string name="multipleSendReceiveSatelliteDatagram">multipleSendReceiveSatelliteDatagram</string>
 
+    <string name="sendMessage">sendMessage</string>
+    <string name="receiveMessage">receiveMessage</string>
+
     <string name="Back">Back</string>
 </resources>
diff --git a/testapps/TestSatelliteApp/src/com/android/phone/testapps/satellitetestapp/SatelliteControl.java b/testapps/TestSatelliteApp/src/com/android/phone/testapps/satellitetestapp/SatelliteControl.java
index 14f3b6b..1ab9f7c 100644
--- a/testapps/TestSatelliteApp/src/com/android/phone/testapps/satellitetestapp/SatelliteControl.java
+++ b/testapps/TestSatelliteApp/src/com/android/phone/testapps/satellitetestapp/SatelliteControl.java
@@ -22,7 +22,7 @@
 import android.os.OutcomeReceiver;
 import android.telephony.satellite.SatelliteCapabilities;
 import android.telephony.satellite.SatelliteManager;
-import android.util.Log;
+import android.telephony.satellite.stub.SatelliteError;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.TextView;
@@ -37,7 +37,7 @@
  */
 public class SatelliteControl extends Activity {
 
-    private static final String TAG = "SatelliteControl";
+    private static final long TIMEOUT = 3000;
 
     private SatelliteManager mSatelliteManager;
 
@@ -75,34 +75,38 @@
     private void enableSatelliteApp(View view) {
         LinkedBlockingQueue<Integer> error = new LinkedBlockingQueue<>(1);
         mSatelliteManager.requestSatelliteEnabled(true, true, Runnable::run, error::offer);
+        TextView textView = findViewById(R.id.text_id);
         try {
-            Integer value = error.poll(1000, TimeUnit.MILLISECONDS);
-            TextView textView = findViewById(R.id.text_id);
-            if (value == 0) {
-                textView.setText("Enable satellite is successful");
-            } else {
-                textView.setText("Status for requestSatelliteEnabled: "
+            Integer value = error.poll(TIMEOUT, TimeUnit.MILLISECONDS);
+            if (value == null) {
+                textView.setText("Timed out to enable the satellite");
+            } else if (value != SatelliteError.ERROR_NONE) {
+                textView.setText("Failed to enable the satellite, error ="
                         + SatelliteErrorUtils.mapError(value));
+            } else {
+                textView.setText("Successfully enabled the satellite");
             }
         } catch (InterruptedException e) {
-            Log.e(TAG, "exception caught =" + e);
+            textView.setText("Enable SatelliteService exception caught =" + e);
         }
     }
 
     private void disableSatelliteApp(View view) {
         LinkedBlockingQueue<Integer> error = new LinkedBlockingQueue<>(1);
         mSatelliteManager.requestSatelliteEnabled(false, true, Runnable::run, error::offer);
+        TextView textView = findViewById(R.id.text_id);
         try {
-            Integer value = error.poll(1000, TimeUnit.MILLISECONDS);
-            TextView textView = findViewById(R.id.text_id);
-            if (value == 0) {
-                textView.setText("Disable satellite is successful");
-            } else {
-                textView.setText("Status for requestSatelliteEnabled: "
+            Integer value = error.poll(TIMEOUT, TimeUnit.MILLISECONDS);
+            if (value == null) {
+                textView.setText("Timed out to disable the satellite");
+            } else if (value != SatelliteError.ERROR_NONE) {
+                textView.setText("Failed to disable the satellite, error ="
                         + SatelliteErrorUtils.mapError(value));
+            } else {
+                textView.setText("Successfully disabled the satellite");
             }
         } catch (InterruptedException e) {
-            Log.e(TAG, "exception caught =" + e);
+            textView.setText("Disable SatelliteService exception caught =" + e);
         }
     }
 
diff --git a/testapps/TestSatelliteApp/src/com/android/phone/testapps/satellitetestapp/SatelliteTestApp.java b/testapps/TestSatelliteApp/src/com/android/phone/testapps/satellitetestapp/SatelliteTestApp.java
index d98e8fb..ac1dcfb 100644
--- a/testapps/TestSatelliteApp/src/com/android/phone/testapps/satellitetestapp/SatelliteTestApp.java
+++ b/testapps/TestSatelliteApp/src/com/android/phone/testapps/satellitetestapp/SatelliteTestApp.java
@@ -37,7 +37,7 @@
 public class SatelliteTestApp extends Activity {
 
     private static final String TAG = "SatelliteTestApp";
-    private static TestSatelliteService sSatelliteService;
+    public static TestSatelliteService sSatelliteService;
     private final Object mSendDatagramLock = new Object();
 
     private TestSatelliteServiceConnection mSatelliteServiceConn;
@@ -82,6 +82,13 @@
                 startActivity(intent);
             }
         });
+        findViewById(R.id.SendReceive).setOnClickListener(new OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                Intent intent = new Intent(SatelliteTestApp.this, SendReceive.class);
+                startActivity(intent);
+            }
+        });
     }
 
     private final ILocalSatelliteListener mSatelliteListener =
diff --git a/testapps/TestSatelliteApp/src/com/android/phone/testapps/satellitetestapp/SendReceive.java b/testapps/TestSatelliteApp/src/com/android/phone/testapps/satellitetestapp/SendReceive.java
new file mode 100644
index 0000000..3bd3775
--- /dev/null
+++ b/testapps/TestSatelliteApp/src/com/android/phone/testapps/satellitetestapp/SendReceive.java
@@ -0,0 +1,283 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.phone.testapps.satellitetestapp;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.CancellationSignal;
+import android.os.OutcomeReceiver;
+import android.telephony.satellite.PointingInfo;
+import android.telephony.satellite.SatelliteCapabilities;
+import android.telephony.satellite.SatelliteDatagram;
+import android.telephony.satellite.SatelliteDatagramCallback;
+import android.telephony.satellite.SatelliteManager;
+import android.telephony.satellite.SatelliteTransmissionUpdateCallback;
+import android.telephony.satellite.stub.SatelliteError;
+import android.util.Log;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.EditText;
+import android.widget.TextView;
+
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Consumer;
+
+/**
+ * Activity related to Send and Receiving of message APIs for satellite.
+ */
+public class SendReceive extends Activity {
+
+    private static final String TAG = "SendReceive";
+
+    private SatelliteManager mSatelliteManager;
+    private SendReceive.SatelliteDatagramCallbackTestApp mCallback;
+
+    private PointingInfo mPointingInfo;
+    private String mMessageInput = "";
+    private String mMessageOutput = "";
+    private static final long TIMEOUT = 3000;
+
+    private EditText mEnterMessage;
+    private TextView mMessageStatusTextView;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        mSatelliteManager = getSystemService(SatelliteManager.class);
+        mCallback = new SendReceive.SatelliteDatagramCallbackTestApp();
+
+        setContentView(R.layout.activity_SendReceive);
+        findViewById(R.id.sendMessage).setOnClickListener(this::sendStatusApp);
+        findViewById(R.id.receiveMessage).setOnClickListener(this::receiveStatusApp);
+        mEnterMessage = (EditText) findViewById(R.id.enterText);
+        mMessageStatusTextView = findViewById(R.id.messageStatus);
+        findViewById(R.id.Back).setOnClickListener(new OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                startActivity(new Intent(SendReceive.this, SatelliteTestApp.class));
+            }
+        });
+    }
+
+    protected class SatelliteDatagramCallbackTestApp implements SatelliteDatagramCallback {
+        @Override
+        public void onSatelliteDatagramReceived(long datagramId, SatelliteDatagram datagram,
+                int pendingCount, Consumer<Void> callback) {
+            Log.d(TAG, "onSatelliteDatagramReceived in TestApp: datagramId =" + datagramId
+                    + ", datagram =" + datagram + ", pendingCount=" + pendingCount);
+            mMessageStatusTextView.setText("Last received satellite message is = "
+                    + new String(datagram.getSatelliteDatagram()));
+        }
+    }
+
+    protected class SatelliteTransmissionUpdateCallbackTestApp implements
+            SatelliteTransmissionUpdateCallback {
+        @Override
+        public void onSatellitePositionChanged(PointingInfo pointingInfo) {
+            mPointingInfo = pointingInfo;
+            Log.d(TAG, "onSatellitePositionChanged in TestApp for sendReceive: pointingInfo = "
+                    + mPointingInfo);
+            TextView satellitePositionTextView = findViewById(R.id.satellitePosition);
+            satellitePositionTextView.setText("Successfully received the satellite position : "
+                    + mPointingInfo);
+        }
+
+        @Override
+        public void onSendDatagramStateChanged(int state, int sendPendingCount, int errorCode) {
+            Log.d(TAG, "onSendDatagramStateChanged in TestApp for sendReceive: state = "
+                    + state + ", sendPendingCount =" + sendPendingCount + ", errorCode="
+                    + errorCode);
+        }
+
+        @Override
+        public void onReceiveDatagramStateChanged(
+                int state, int receivePendingCount, int errorCode) {
+            Log.d(TAG, "onReceiveDatagramStateChanged in TestApp for sendReceive: state = "
+                    + state + ", " + "receivePendingCount=" + receivePendingCount + ", errorCode="
+                    + errorCode);
+        }
+    }
+
+    private void sendStatusApp(View view) {
+        LinkedBlockingQueue<Integer> error = new LinkedBlockingQueue<>(1);
+        mMessageInput = mEnterMessage.getText().toString();
+        mMessageOutput = mEnterMessage.getText().toString();
+        byte[] testProvisionData = mMessageInput.getBytes();
+        setupForTransferringDatagram(testProvisionData);
+
+        SatelliteDatagram datagram = new SatelliteDatagram(mMessageInput.getBytes());
+        //Sending Message
+        mSatelliteManager.sendSatelliteDatagram(SatelliteManager.DATAGRAM_TYPE_SOS_MESSAGE,
+                datagram, true, Runnable::run, error::offer);
+        TextView messageStatusTextView = findViewById(R.id.messageStatus);
+        try {
+            Integer value = error.poll(TIMEOUT, TimeUnit.MILLISECONDS);
+            if (value == null) {
+                messageStatusTextView.setText("Timed out to send the message");
+            } else if (value != SatelliteError.ERROR_NONE) {
+                messageStatusTextView.setText("Failed to send the message, error ="
+                        + SatelliteErrorUtils.mapError(value));
+            } else {
+                messageStatusTextView.setText("Successfully sent the message = "
+                        + mEnterMessage.getText().toString());
+            }
+        } catch (InterruptedException e) {
+            messageStatusTextView.setText("sendSatelliteDatagram exception caught = " + e);
+        }
+    }
+
+    private void receiveStatusApp(View view) {
+        LinkedBlockingQueue<Integer> resultListener = new LinkedBlockingQueue<>(1);
+        byte[] testProvisionData = mMessageOutput.getBytes();
+        setupForTransferringDatagram(testProvisionData);
+
+        int result = mSatelliteManager.registerForSatelliteDatagram(Runnable::run, mCallback);
+        TextView showErrorStatusTextView = findViewById(R.id.showErrorStatus);
+        if (result != SatelliteError.ERROR_NONE) {
+            showErrorStatusTextView.setText("Status for registerForSatelliteDatagram : "
+                    + SatelliteErrorUtils.mapError(result));
+        }
+        if (SatelliteTestApp.getTestSatelliteService() != null) {
+            SatelliteTestApp.getTestSatelliteService().sendOnPendingDatagrams();
+        }
+        mSatelliteManager.requestSatelliteEnabled(true, true, Runnable::run, resultListener::offer);
+        try {
+            Integer value = resultListener.poll(TIMEOUT, TimeUnit.MILLISECONDS);
+            if (value == null) {
+                showErrorStatusTextView.setText("Timed out to enable the satellite");
+            } else if (value != SatelliteError.ERROR_NONE) {
+                showErrorStatusTextView.setText("Failed to enable satellite, error = "
+                        + SatelliteErrorUtils.mapError(value));
+                return;
+            }
+            resultListener.clear();
+        } catch (InterruptedException e) {
+            showErrorStatusTextView.setText("Enable SatelliteService exception caught = " + e);
+            return;
+        }
+
+        mSatelliteManager.pollPendingSatelliteDatagrams(Runnable::run, resultListener::offer);
+        try {
+            Integer value = resultListener.poll(TIMEOUT, TimeUnit.MILLISECONDS);
+            if (value == null) {
+                mMessageStatusTextView.setText("Timed out to poll pending messages");
+            } else if (value != SatelliteError.ERROR_NONE) {
+                mMessageStatusTextView.setText("Failed to poll pending messages, error = "
+                        + SatelliteErrorUtils.mapError(value));
+            }  else {
+                mMessageStatusTextView.setText("Successfully polled pending messages");
+            }
+        } catch (InterruptedException e) {
+            mMessageStatusTextView.setText("pollPendingSatelliteDatagrams exception caught = " + e);
+        }
+    }
+
+    private void setupForTransferringDatagram(byte[] provisionData) {
+        TextView showErrorStatusTextView = findViewById(R.id.showErrorStatus);
+        CancellationSignal cancellationSignal = new CancellationSignal();
+        LinkedBlockingQueue<Integer> error = new LinkedBlockingQueue<>(1);
+
+        //Provisioning
+        mSatelliteManager.provisionSatelliteService("SATELLITE_TOKEN", provisionData,
+                cancellationSignal, Runnable::run, error::offer);
+        try {
+            Integer value = error.poll(TIMEOUT, TimeUnit.MILLISECONDS);
+            if (value == null) {
+                showErrorStatusTextView.setText("Timed out to provision the satellite");
+            } else if (value != SatelliteError.ERROR_NONE) {
+                showErrorStatusTextView.setText("Failed to provision satellite, error = "
+                        + SatelliteErrorUtils.mapError(value));
+                return;
+            }
+        } catch (InterruptedException e) {
+            showErrorStatusTextView.setText("Provision SatelliteService exception caught = " + e);
+            return;
+        }
+        error.clear();
+
+        //Static position of device
+        final AtomicReference<SatelliteCapabilities> capabilities = new AtomicReference<>();
+        final AtomicReference<Integer> errorCode = new AtomicReference<>();
+        OutcomeReceiver<SatelliteCapabilities, SatelliteManager.SatelliteException> receiver =
+                new OutcomeReceiver<>() {
+                    @Override
+                    public void onResult(SatelliteCapabilities result) {
+                        capabilities.set(result);
+                        TextView devicePositionTextView = findViewById(R.id.devicePosition);
+                        devicePositionTextView.setText("Successfully receive the device position : "
+                                + capabilities.get().getAntennaPositionMap());
+                    }
+
+                    @Override
+                    public void onError(SatelliteManager.SatelliteException exception) {
+                        errorCode.set(exception.getErrorCode());
+                        TextView devicePositionTextView = findViewById(R.id.devicePosition);
+                        devicePositionTextView.setText("Unable to fetch device position error is : "
+                                + SatelliteErrorUtils.mapError(errorCode.get()));
+                    }
+                };
+        mSatelliteManager.requestSatelliteCapabilities(Runnable::run, receiver);
+
+        //Satellite Position
+        SatelliteTransmissionUpdateCallbackTestApp callback =
+                new SatelliteTransmissionUpdateCallbackTestApp();
+        mSatelliteManager.requestSatelliteEnabled(true, true, Runnable::run, error::offer);
+        try {
+            Integer value = error.poll(TIMEOUT, TimeUnit.MILLISECONDS);
+            if (value == null) {
+                showErrorStatusTextView.setText("Timed out to enable the satellite");
+            } else if (value != SatelliteError.ERROR_NONE) {
+                showErrorStatusTextView.setText("Failed to enable satellite, error = "
+                        + SatelliteErrorUtils.mapError(value));
+                return;
+            }
+        } catch (InterruptedException e) {
+            showErrorStatusTextView.setText("Enable SatelliteService exception caught = " + e);
+            return;
+        }
+        error.clear();
+
+        mSatelliteManager.startSatelliteTransmissionUpdates(Runnable::run, error::offer, callback);
+        // Position update
+        android.telephony.satellite.stub.PointingInfo pointingInfo =
+                new android.telephony.satellite.stub.PointingInfo();
+        pointingInfo.satelliteAzimuth = 50.5f;
+        pointingInfo.satelliteElevation = 20.36f;
+        if (SatelliteTestApp.getTestSatelliteService() != null) {
+            SatelliteTestApp.getTestSatelliteService().sendOnSatellitePositionChanged(pointingInfo);
+        }
+        TextView satellitePositionTextView = findViewById(R.id.satellitePosition);
+        try {
+            Integer value = error.poll(TIMEOUT, TimeUnit.MILLISECONDS);
+            if (value == null) {
+                satellitePositionTextView.setText("Failed to register for satellite transmission"
+                        + "updates");
+            } else if (value != SatelliteError.ERROR_NONE) {
+                satellitePositionTextView.setText("Failed to register for satellite transmission "
+                        + "updates, error = " + SatelliteErrorUtils.mapError(value));
+            }
+        } catch (InterruptedException e) {
+            satellitePositionTextView.setText("startSatelliteTransmissionUpdates exception caught ="
+                        + e);
+        }
+        //Device is aligned with the satellite for demo mode
+        mSatelliteManager.onDeviceAlignedWithSatellite(true);
+    }
+}