diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index f0e26dd..58b0125 100755
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="org.envaya.sms"
-      android:versionCode="13"
-      android:versionName="2.0">
+      android:versionCode="14"
+      android:versionName="2.0.1">
          
     <uses-sdk android:minSdkVersion="4" />
          
@@ -105,17 +105,26 @@
             </intent-filter>            
         </receiver>        
         
-        <receiver android:name=".receiver.ConnectivityChangeReceiver" > 
+        <receiver android:name=".receiver.ConnectivityChangeReceiver" >        
             <intent-filter> 
                 <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
             </intent-filter> 
         </receiver>         
         
+        <receiver android:name=".receiver.DeviceStatusReceiver"> 
+            <intent-filter>
+                <action android:name="android.intent.action.ACTION_POWER_CONNECTED" />
+                <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED" />
+                <action android:name="android.intent.action.BATTERY_LOW" />
+                <action android:name="android.intent.action.BATTERY_OKAY" />
+            </intent-filter>
+        </receiver>
+        
         <service android:name=".CheckMmsInboxService">
         </service>
 
         <service android:name=".ForegroundService">
         </service>            
         
-    </application>    
+    </application>
 </manifest> 
\ No newline at end of file
diff --git a/server/php/EnvayaSMS.php b/server/php/EnvayaSMS.php
index d2ff8e9..5580050 100755
--- a/server/php/EnvayaSMS.php
+++ b/server/php/EnvayaSMS.php
@@ -11,12 +11,18 @@ class EnvayaSMS
     const ACTION_INCOMING = 'incoming';
     const ACTION_OUTGOING = 'outgoing';
     const ACTION_SEND_STATUS = 'send_status';
+    const ACTION_DEVICE_STATUS = 'device_status';
     const ACTION_TEST = 'test';
 
     const STATUS_QUEUED = 'queued';
     const STATUS_FAILED = 'failed';
     const STATUS_SENT = 'sent';
     
+    const DEVICE_STATUS_POWER_CONNECTED = "power_connected";
+    const DEVICE_STATUS_POWER_DISCONNECTED = "power_disconnected";
+    const DEVICE_STATUS_BATTERY_LOW = "battery_low";
+    const DEVICE_STATUS_BATTERY_OKAY = "battery_okay";
+    
     const MESSAGE_TYPE_SMS = 'sms';
     const MESSAGE_TYPE_MMS = 'mms';    
     
@@ -49,11 +55,13 @@ class EnvayaSMS_Request
     
     public $version;
     public $phone_number;
+    public $log;
 
     function __construct()
     {
         $this->version = $_POST['version'];
         $this->phone_number = $_POST['phone_number'];
+        $this->log = @$_POST['log'];
     }
     
     function get_action()
@@ -77,6 +85,8 @@ class EnvayaSMS_Request
                 return new EnvayaSMS_Action_SendStatus($this);
             case EnvayaSMS::ACTION_TEST:
                 return new EnvayaSMS_Action_Test($this);
+            case EnvayaSMS::ACTION_DEVICE_STATUS:
+                return new EnvayaSMS_Action_DeviceStatus($this);                
             default:
                 return new EnvayaSMS_Action($this);
         }
@@ -247,4 +257,16 @@ class EnvayaSMS_Action_SendStatus extends EnvayaSMS_Action
         $this->id = $_POST['id'];
         $this->error = $_POST['error'];
     } 
-}
\ No newline at end of file
+}
+
+class EnvayaSMS_Action_DeviceStatus extends EnvayaSMS_Action
+{    
+    public $status;     // EnvayaSMS::DEVICE_STATUS_* values
+    
+    function __construct($request)
+    {
+        parent::__construct($request);   
+        $this->type = EnvayaSMS::ACTION_DEVICE_STATUS;        
+        $this->status = $_POST['status'];
+    } 
+}
diff --git a/server/php/example/log/.gitignore b/server/php/example/log/.gitignore
new file mode 100644
index 0000000..bf0824e
--- /dev/null
+++ b/server/php/example/log/.gitignore
@@ -0,0 +1 @@
+*.log
\ No newline at end of file
diff --git a/server/php/example/www/index.php b/server/php/example/www/index.php
index ff3c80c..510895f 100755
--- a/server/php/example/www/index.php
+++ b/server/php/example/www/index.php
@@ -22,6 +22,16 @@ if (!isset($password) || !$request->is_validated($password))
     return;
 }
 
+// append to EnvayaSMS app log
+$app_log = $request->log;
+if ($app_log)
+{
+    $log_file = dirname(__DIR__)."/log/sms_".preg_replace('#[^\w]#', '', $request->phone_number).".log";        
+    $f = fopen($log_file, "a");
+    fwrite($f, $app_log);
+    fclose($f);        
+} 
+
 $action = $request->get_action();
 
 switch ($action->type)
@@ -79,6 +89,10 @@ switch ($action->type)
             echo "invalid id";            
         }   
         return;
+    case EnvayaSMS::ACTION_DEVICE_STATUS:
+        error_log("device_status = {$action->status}");
+        echo "OK";
+        return;        
     case EnvayaSMS::ACTION_TEST:
         echo "OK";
         return;        
diff --git a/server/php/example/www/test.html b/server/php/example/www/test.html
index b8e5bd0..4023439 100755
--- a/server/php/example/www/test.html
+++ b/server/php/example/www/test.html
@@ -1,6 +1,6 @@
 <html>
 <head>
-
+<title>EnvayaSMS Request Simulator</title>
 <style type='text/css'>
 body
 {
@@ -30,10 +30,12 @@ body
 <tr><th>Server URL</th><td><input id='server_url' type='text' size='40' /></td></tr>
 <tr><th>Phone Number</th><td><input id='phone_number' type='text' /></td></tr>
 <tr><th>Password</th><td><input id='password' type='password' /></td></tr>
+<tr><th>Log Messages</th><td><textarea id='log'  style='width:250px'></textarea></td></tr>
 <tr><th>Action</th><td><select id='action' onchange='actionChanged()' onkeypress='actionChanged()'>
     <option value='incoming'>incoming</option>
     <option value='outgoing'>outgoing</option>
     <option value='send_status'>send_status</option>
+    <option value='device_status'>device_status</option>
     <option value='test'>test</option>
 </select></td></tr>
 </table>
@@ -46,7 +48,7 @@ body
     <option value='sms'>sms</option>
     <option value='mms'>mms</option>
 </select></td></tr>
-<tr><th>Message</th><td><textarea id='message'></textarea></td></tr>
+<tr><th>Message</th><td><textarea id='message' style='width:250px'></textarea></td></tr>
 <tr><th>Timestamp</th><td><input id='timestamp' type='text' /></td></tr>
 </table>
 </div>
@@ -70,6 +72,17 @@ body
 <h4>Parameters for action=test:</h4>
 (None)
 </div>
+<div id='action_device_status'  style='display:none'>
+<h4>Parameters for action=device_status:</h4>
+<table class='smsTable'>
+<tr><th>Status</th><td><select id='device_status'>
+    <option value='power_connected'>power_connected</option>
+    <option value='power_disconnected'>power_disconnected</option>
+    <option value='battery_low'>battery_low</option>    
+    <option value='battery_okay'>battery_okay</option>    
+</select></td></tr>
+</table>
+</div>
 
 
 <script type='text/javascript'>
@@ -100,6 +113,7 @@ function performAction() {
         version: '13',
         phone_number: $('phone_number').value,
         action: action,
+        log: $('log').value
     };  
     
     if (action == 'incoming')
@@ -115,6 +129,10 @@ function performAction() {
         params.status = $('status').value;
         params.error = $('error').value;
     }
+    else if (action == 'device_status')
+    {
+        params.status = $('device_status').value;
+    }
             
     var xhr = (window.ActiveXObject && !window.XMLHttpRequest) ? new ActiveXObject("Msxml2.XMLHTTP") : new XMLHttpRequest();
 
diff --git a/src/org/envaya/sms/App.java b/src/org/envaya/sms/App.java
index 3da20a7..4a48412 100755
--- a/src/org/envaya/sms/App.java
+++ b/src/org/envaya/sms/App.java
@@ -26,8 +26,10 @@ import java.text.DateFormat;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.HashMap;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.Queue;
 import org.apache.http.client.HttpClient;
 import org.apache.http.conn.scheme.PlainSocketFactory;
 import org.apache.http.conn.scheme.Scheme;
@@ -41,6 +43,7 @@ import org.apache.http.params.HttpParams;
 import org.apache.http.params.HttpProtocolParams;
 import org.envaya.sms.receiver.OutgoingMessagePoller;
 import org.envaya.sms.receiver.ReenableWifiReceiver;
+import org.envaya.sms.task.HttpTask;
 import org.envaya.sms.task.PollerTask;
 import org.json.JSONArray;
 import org.json.JSONException;
@@ -50,12 +53,18 @@ public final class App extends Application {
     public static final String ACTION_OUTGOING = "outgoing";
     public static final String ACTION_INCOMING = "incoming";
     public static final String ACTION_SEND_STATUS = "send_status";
+    public static final String ACTION_DEVICE_STATUS = "device_status";
     public static final String ACTION_TEST = "test";
     
     public static final String STATUS_QUEUED = "queued";
     public static final String STATUS_FAILED = "failed";
     public static final String STATUS_SENT = "sent";
     
+    public static final String DEVICE_STATUS_POWER_CONNECTED = "power_connected";
+    public static final String DEVICE_STATUS_POWER_DISCONNECTED = "power_disconnected";
+    public static final String DEVICE_STATUS_BATTERY_LOW = "battery_low";
+    public static final String DEVICE_STATUS_BATTERY_OKAY = "battery_okay";
+    
     public static final String MESSAGE_TYPE_MMS = "mms";
     public static final String MESSAGE_TYPE_SMS = "sms";
     
@@ -114,6 +123,8 @@ public final class App extends Application {
     public final Inbox inbox = new Inbox(this);
     public final Outbox outbox = new Outbox(this);    
     
+    public final Queue<HttpTask> queuedTasks = new LinkedList<HttpTask>();
+    
     private SharedPreferences settings;
     private MmsObserver mmsObserver;
     private SpannableStringBuilder displayedLog = new SpannableStringBuilder();
@@ -427,10 +438,11 @@ public final class App extends Application {
     public synchronized void retryStuckMessages() {        
         outbox.retryAll();
         inbox.retryAll();
+        retryQueuedTasks();
     }
 
-    public synchronized int getPendingMessageCount() {        
-        return outbox.size() + inbox.size();
+    public synchronized int getPendingTaskCount() {        
+        return outbox.size() + inbox.size() + queuedTasks.size();
     }
     
     public void debug(String msg) {
@@ -439,8 +451,24 @@ public final class App extends Application {
 
     private int logEpoch = 0;
     
-    public synchronized void log(CharSequence msg) 
+    private StringBuilder newLogBuffer = new StringBuilder();
+    
+    public synchronized String getNewLogEntries()
     {
+        String res = newLogBuffer.toString();
+        newLogBuffer.setLength(0);
+        return res;
+    }
+    
+    // clients may sometimes unget log entries out of order,
+    // but most of the time this will be the right order
+    public synchronized void ungetNewLogEntries(String logEntries)
+    {
+        newLogBuffer.insert(0, logEntries);
+    }
+    
+    public synchronized void log(CharSequence msg) 
+    {        
         Log.d(LOG_NAME, msg.toString());       
                                  
         // prevent displayed log from growing too big
@@ -462,6 +490,8 @@ public final class App extends Application {
             logEpoch++;
         }
 
+        int prevLength = displayedLog.length();
+        
         // display a timestamp in the log occasionally        
         long logTime = SystemClock.elapsedRealtime();        
         if (logTime - lastLogTime > LOG_TIMESTAMP_INTERVAL)
@@ -472,8 +502,10 @@ public final class App extends Application {
         }
         
         displayedLog.append(msg);
-        displayedLog.append("\n");        
-            
+        displayedLog.append("\n");  
+                
+        newLogBuffer.append(displayedLog, prevLength, displayedLog.length());
+    
         sendBroadcast(new Intent(App.LOG_CHANGED_INTENT));
     }
 
@@ -670,12 +702,23 @@ public final class App extends Application {
 
         if (activeNetwork == null || !activeNetwork.isConnected())
         {
-            WifiManager wmgr = (WifiManager)getSystemService(Context.WIFI_SERVICE);
+            WifiManager wmgr = (WifiManager)getSystemService(Context.WIFI_SERVICE);            
+
+            if (activeNetwork != null)
+            {
+                log(activeNetwork.getTypeName() + "=" + activeNetwork.getState());
+            }
+            else
+            {
+                log("Not connected to any network.");   
+            }
             
             if (!wmgr.isWifiEnabled() && isNetworkFailoverEnabled())
             {
+                log("Enabling WIFI...");
                 wmgr.setWifiEnabled(true);
             }
+
             return;
         }
         
@@ -799,7 +842,28 @@ public final class App extends Application {
         if (getOutgoingPollSeconds() > 0)
         {
             checkOutgoingMessages();
-        }                
-        // failed outgoing message status notifications are dropped...
+        }
+        
+        retryQueuedTasks();
     }    
+    
+    public synchronized void retryQueuedTasks()
+    {        
+        while (true)
+        {
+            HttpTask task = queuedTasks.poll();
+            
+            if (task == null)
+            {
+                break;
+            }
+            
+            task.execute();
+        }
+    }
+    
+    public synchronized void addQueuedTask(HttpTask task)
+    {
+        queuedTasks.add(task);
+    }
 }
diff --git a/src/org/envaya/sms/Outbox.java b/src/org/envaya/sms/Outbox.java
index 4032b96..9c9c8fe 100755
--- a/src/org/envaya/sms/Outbox.java
+++ b/src/org/envaya/sms/Outbox.java
@@ -57,8 +57,8 @@ public class Outbox {
         this.app = app;
     }    
     
-    private void notifyMessageStatus(OutgoingMessage sms, String status, String errorMessage) {
-        String serverId = sms.getServerId();
+    private void notifyMessageStatus(OutgoingMessage sms, final String status, final String errorMessage) {
+        final String serverId = sms.getServerId();
                
         String logMessage;
         if (status.equals(App.STATUS_SENT)) {
@@ -73,12 +73,15 @@ public class Outbox {
         if (serverId != null) {
             app.log("Notifying server " + smsDesc + " " + logMessage);
 
-            new HttpTask(app,
+            HttpTask task = new HttpTask(app,
                 new BasicNameValuePair("id", serverId),
                 new BasicNameValuePair("status", status),
                 new BasicNameValuePair("error", errorMessage),
                 new BasicNameValuePair("action", App.ACTION_SEND_STATUS)                    
-            ).execute();
+            );
+            task.setRetryOnConnectivityError(true);
+            task.execute();
+            
         } else {
             app.log(smsDesc + " " + logMessage);
         }
diff --git a/src/org/envaya/sms/receiver/DeviceStatusReceiver.java b/src/org/envaya/sms/receiver/DeviceStatusReceiver.java
new file mode 100755
index 0000000..5d0af64
--- /dev/null
+++ b/src/org/envaya/sms/receiver/DeviceStatusReceiver.java
@@ -0,0 +1,53 @@
+package org.envaya.sms.receiver;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import org.apache.http.message.BasicNameValuePair;
+import org.envaya.sms.App;
+import org.envaya.sms.task.HttpTask;
+
+public class DeviceStatusReceiver extends BroadcastReceiver
+{
+    @Override
+    public void onReceive(Context context, Intent intent) 
+    {        
+        App app = (App) context.getApplicationContext();        
+        if (!app.isEnabled())
+        {
+            return;
+        }
+        
+        String action = intent.getAction();
+        
+        String status = "";
+        
+        if (Intent.ACTION_POWER_CONNECTED.equals(action))
+        {
+            status = App.DEVICE_STATUS_POWER_CONNECTED;
+            app.log("Power connected");
+        }
+        else if (Intent.ACTION_POWER_DISCONNECTED.equals(action))
+        {
+            status = App.DEVICE_STATUS_POWER_DISCONNECTED;
+            app.log("Power disconnected");
+        }
+        else if (Intent.ACTION_BATTERY_LOW.equals(action))
+        {
+            status = App.DEVICE_STATUS_BATTERY_LOW;
+            app.log("Battery low");
+        }
+        else if (Intent.ACTION_BATTERY_OKAY.equals(action))
+        {
+            status = App.DEVICE_STATUS_BATTERY_OKAY;
+            app.log("Battery okay");
+        }
+
+        HttpTask task = new HttpTask(app, 
+            new BasicNameValuePair("action", App.ACTION_DEVICE_STATUS),
+            new BasicNameValuePair("status", status)
+        );
+        task.setRetryOnConnectivityError(true);
+        task.execute();
+    }
+}    
\ No newline at end of file
diff --git a/src/org/envaya/sms/task/HttpTask.java b/src/org/envaya/sms/task/HttpTask.java
index 74e89e1..5d99cb9 100755
--- a/src/org/envaya/sms/task/HttpTask.java
+++ b/src/org/envaya/sms/task/HttpTask.java
@@ -43,27 +43,40 @@ public class HttpTask extends AsyncTask<String, Void, HttpResponse> {
     
     protected String url;    
     protected List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
+    
+    protected BasicNameValuePair[] paramsArr;
 
     private List<FormBodyPart> formParts;
     private boolean useMultipartPost = false;    
     
     private HttpPost post;
+    private String logEntries;    
     
+    private boolean retryOnConnectivityError;
+        
     public HttpTask(App app, BasicNameValuePair... paramsArr)
     {
         super();
-        this.app = app;        
-        this.url = app.getServerUrl();
-        params = new ArrayList<BasicNameValuePair>(Arrays.asList(paramsArr));            
-        params.add(new BasicNameValuePair("version", "" + app.getPackageInfo().versionCode));
-        params.add(new BasicNameValuePair("phone_number", app.getPhoneNumber()));                       
+        this.app = app;                
+        this.paramsArr = paramsArr;        
+        params = new ArrayList<BasicNameValuePair>(Arrays.asList(paramsArr));
     }
     
+    public void setRetryOnConnectivityError(boolean retry)
+    {
+        this.retryOnConnectivityError = retry;
+    }
+    
+    protected HttpTask getCopy()
+    {
+        return new HttpTask(app, paramsArr);
+    }    
+    
     public void setFormParts(List<FormBodyPart> formParts)
     {
         useMultipartPost = true;
         this.formParts = formParts;
-    }                  
+    }                 
     
     private String getSignature()
             throws NoSuchAlgorithmException, UnsupportedEncodingException
@@ -97,12 +110,20 @@ public class HttpTask extends AsyncTask<String, Void, HttpResponse> {
         return new String(Base64Coder.encode(digest));            
     }    
     
-    protected HttpResponse doInBackground(String... ignored) {
+    protected HttpResponse doInBackground(String... ignored) {        
+        url = app.getServerUrl();        
+        
         if (url.length() == 0) {
             app.log("Can't contact server; Server URL not set");                        
             return null;
         }
 
+        logEntries = app.getNewLogEntries();
+        
+        params.add(new BasicNameValuePair("version", "" + app.getPackageInfo().versionCode));
+        params.add(new BasicNameValuePair("phone_number", app.getPhoneNumber()));
+        params.add(new BasicNameValuePair("log", logEntries));        
+                
         post = new HttpPost(url);        
         
         try
@@ -145,6 +166,7 @@ public class HttpTask extends AsyncTask<String, Void, HttpResponse> {
             else if (statusCode == 403)
             {
                 response.getEntity().consumeContent();
+                app.ungetNewLogEntries(logEntries);
                 app.log("Failed to authenticate to server");
                 app.log("(Phone number or password may be incorrect)");                
                 return null;
@@ -152,17 +174,24 @@ public class HttpTask extends AsyncTask<String, Void, HttpResponse> {
             else 
             {
                 response.getEntity().consumeContent();
+                app.ungetNewLogEntries(logEntries);
                 app.log("Received HTTP " + statusCode + " from server");
                 return null;
-            }            
+            }
         } 
         catch (IOException ex) 
         {
             post.abort();
+            app.ungetNewLogEntries(logEntries);
             app.logError("Error while contacting server", ex);
             
             if (ex instanceof UnknownHostException || ex instanceof SocketTimeoutException)
-            {                
+            {
+                if (retryOnConnectivityError)
+                {
+                    app.addQueuedTask(getCopy());
+                }
+                
                 app.asyncCheckConnectivity();
             }
             return null;
@@ -170,6 +199,7 @@ public class HttpTask extends AsyncTask<String, Void, HttpResponse> {
         catch (Throwable ex) 
         {
             post.abort();
+            app.ungetNewLogEntries(logEntries);
             app.logError("Unexpected error while contacting server", ex, true);
             return null;
         }        
diff --git a/src/org/envaya/sms/ui/Main.java b/src/org/envaya/sms/ui/Main.java
index 87c1db3..b4ddb5b 100755
--- a/src/org/envaya/sms/ui/Main.java
+++ b/src/org/envaya/sms/ui/Main.java
@@ -100,6 +100,13 @@ public class Main extends Activity {
         registerReceiver(logReceiver, logReceiverFilter);
     }    
     
+    @Override
+    public void onDestroy()
+    {        
+        this.unregisterReceiver(logReceiver);        
+        super.onDestroy();
+    }
+    
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         // Handle item selection
@@ -140,9 +147,9 @@ public class Main extends Activity {
     @Override
     public boolean onPrepareOptionsMenu(Menu menu) {
         MenuItem retryItem = menu.findItem(R.id.retry_now);
-        int pendingMessages = app.getPendingMessageCount();
-        retryItem.setEnabled(pendingMessages > 0);
-        retryItem.setTitle("Retry All (" + pendingMessages + ")");
+        int pendingTasks = app.getPendingTaskCount();
+        retryItem.setEnabled(pendingTasks > 0);
+        retryItem.setTitle("Retry All (" + pendingTasks + ")");
         
         return true;
     }
diff --git a/src/org/envaya/sms/ui/PendingMessages.java b/src/org/envaya/sms/ui/PendingMessages.java
index 3dc8082..db95191 100755
--- a/src/org/envaya/sms/ui/PendingMessages.java
+++ b/src/org/envaya/sms/ui/PendingMessages.java
@@ -93,6 +93,13 @@ public class PendingMessages extends ListActivity {
         
         refreshMessages();
     }
+    
+    @Override
+    public void onDestroy()
+    {
+        this.unregisterReceiver(refreshReceiver);        
+        super.onDestroy();
+    }    
 
     public void refreshMessages()
     {