diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 57f9995..20778d4 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -2,8 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="uk.org.openseizuredetector"
-    android:versionCode="91"
-    android:versionName="3.7.0b">
+    android:versionCode="92"
+    android:versionName="3.9.0a">
     <!-- android:allowBackup="false" -->
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
diff --git a/app/src/main/java/uk/org/openseizuredetector/LogManager.java b/app/src/main/java/uk/org/openseizuredetector/LogManager.java
index 38c1d20..3c30de4 100644
--- a/app/src/main/java/uk/org/openseizuredetector/LogManager.java
+++ b/app/src/main/java/uk/org/openseizuredetector/LogManager.java
@@ -67,6 +67,7 @@ public class LogManager {
 
 
     public LogManager(Context context) {
+        Log.d(TAG,"LogManger Constructor");
         mLogRemote = false;
         mLogRemoteMobile = false;
         mOSDUrl = null;
@@ -74,17 +75,21 @@ public class LogManager {
 
         Handler handler = new Handler();
         mUtil = new OsdUtil(mContext, handler);
-
+        openDb();
         startRemoteLogTimer();
     }
 
     private boolean openDb() {
+        Log.d(TAG, "openDb");
         try {
             mOSDDb = new OsdDbHelper(mDbTableName, mContext);
             if (!checkTableExists(mOSDDb, mDbTableName)) {
                 Log.e(TAG,"ERROR - Table does not exist");
                 return false;
             }
+            else {
+                Log.d(TAG,"table "+mDbTableName+" exists ok");
+            }
             return true;
         } catch (SQLException e) {
             Log.e(TAG, "Failed to open Database: " + e.toString());
@@ -96,6 +101,7 @@ public class LogManager {
     private boolean checkTableExists(OsdDbHelper osdDb, String osdTableName) {
         Cursor c = null;
         boolean tableExists = false;
+        Log.d(TAG,"checkTableExists()");
         try {
             c = osdDb.getWritableDatabase().query(osdTableName, null,
                     null, null, null, null, null);
@@ -120,6 +126,9 @@ public class LogManager {
         String SQLStr = "SQLStr";
 
         try {
+            double  roiRatio = -1;
+            if (sdData.specPower != 0)
+                roiRatio = 10. * sdData.roiPower / sdData.specPower;
             SQLStr = "INSERT INTO "+ mDbTableName
                     + "(dataTime, wearer_id, BattPC, specPow, roiRatio, avAcc, sdAcc, hr, status, dataJSON, uploaded)"
                     + " VALUES("
@@ -127,7 +136,7 @@ public class LogManager {
                     + -1 + ","
                     + sdData.batteryPc + ","
                     + sdData.specPower + ","
-                    + 10. * sdData.roiPower / sdData.specPower + ","
+                    + roiRatio + ","
                     + sdData.getAvAcc() + ","
                     + sdData.getSdAcc() + ","
                     + sdData.mHR + ","
@@ -136,6 +145,7 @@ public class LogManager {
                     + 0
                     +")";
             mOSDDb.getWritableDatabase().execSQL(SQLStr);
+            Log.d(TAG,"data written to database");
 
         } catch (SQLException e) {
             Log.e(TAG,"writeToLocalDb(): Error Writing Data: " + e.toString());
@@ -302,10 +312,11 @@ public class LogManager {
         public static final int DATABASE_VERSION = 1;
         public static final String DATABASE_NAME = "OsdData.db";
         private String mOsdTableName;
-        private String TAG = "OsdDbHelper";
+        private String TAG = "LogManager.OsdDbHelper";
 
         public OsdDbHelper(String osdTableName, Context context) {
             super(context, DATABASE_NAME, null, DATABASE_VERSION);
+            Log.d(TAG,"OsdDbHelper constructor");
             mOsdTableName = osdTableName;
         }
         public void onCreate(SQLiteDatabase db) {
diff --git a/app/src/main/java/uk/org/openseizuredetector/SdServer.java b/app/src/main/java/uk/org/openseizuredetector/SdServer.java
index 8eb761d..b6b12ca 100644
--- a/app/src/main/java/uk/org/openseizuredetector/SdServer.java
+++ b/app/src/main/java/uk/org/openseizuredetector/SdServer.java
@@ -219,9 +219,7 @@ public class SdServer extends Service implements SdDataReceiver {
         updatePrefs();
 
         // Create our log manager.
-        //mLm = new LogManager(mLogDataRemote, mLogDataRemoteMobile,
-        //        mOSDUname, mOSDPasswd, mOSDWearerId, mOSDUrl, this);
-        //mLm = new LogManager(this);
+        mLm = new LogManager(this);
 
         Log.v(TAG, "onStartCommand: Datasource =" + mSdDataSourceName);
         switch (mSdDataSourceName) {
@@ -1109,7 +1107,7 @@ public class SdServer extends Service implements SdDataReceiver {
         if (mLogData) {
             Log.v(TAG, "logData() - writing data to SD Card");
             writeToSD();
-            //mLm.writeToLocalDb(mSdData);
+            mLm.writeToLocalDb(mSdData);
         }
     }
 
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index b023675..fda5bda 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -2,7 +2,8 @@
 <resources>
     <string name="app_name">OpenSeizureDetector</string>
     <string name="changelog">
-        "V3.7.0 - Added support for Garmin Blood Oxygen Saturation measurements
+        "V3.9.x - Added logging of data to remote server
+        \nV3.7.0 - Added support for Garmin Blood Oxygen Saturation measurements
         \nV3.6.2 - Fix of issue with log file permissions on some Android 10 devices and added more translatable strings with polish translation.
         \nV3.6.1 - Possible fix for issue with shutting down system and expanded Polish translation to all settings screens.
         \nV3.6 - Added phone sensor data source for testing without a watches