diff --git a/app/src/main/java/info/nightscout/android/medtronic/service/MedtronicCNLService.java b/app/src/main/java/info/nightscout/android/medtronic/service/MedtronicCNLService.java
index c9ef0e9f55165be32f5a7da356334fe0e13d112c..ea617d1dd89da546d7a01649112ef1ef24c27c73 100644
--- a/app/src/main/java/info/nightscout/android/medtronic/service/MedtronicCNLService.java
+++ b/app/src/main/java/info/nightscout/android/medtronic/service/MedtronicCNLService.java
@@ -52,18 +52,13 @@ public class MedtronicCNLService extends AbstractService {
     private Context mContext;
     private NotificationManager nm;
     private final static long FIVE_MINS_MS = 300000L;
-    private UploadHelper mUploader;
-    private WifiManager mWifiManager;
     private UsbManager mUsbManager;
-    private SharedPreferences prefs;
 
     @Override
     public void onStartService() {
         Log.i(TAG, "onStartService called");
         mContext = this.getBaseContext();
-        mWifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
         mUsbManager = (UsbManager) this.getSystemService(Context.USB_SERVICE);
-        prefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
 
         // Add a small start delay - for some reason, having no start delay causes initial
         // binding/rendering issues
@@ -100,7 +95,7 @@ public class MedtronicCNLService extends AbstractService {
     }
 
     protected void doReadAndUpload() {
-        mUploader = new UploadHelper(getBaseContext());
+        UploadHelper mUploader = new UploadHelper(getBaseContext());
         mHidDevice = UsbHidDriver.acquire(mUsbManager, USB_VID, USB_PID);
 
         // Load the initial data to the display
@@ -128,8 +123,6 @@ public class MedtronicCNLService extends AbstractService {
             // Go get the data
             MedtronicCNLReader cnlReader = new MedtronicCNLReader(mHidDevice);
 
-            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
-
             try {
                 send(Message.obtain(null, Medtronic640gActivity.DexcomG4ActivityHandler.MSG_STATUS, "Connecting to the Contour Next Link..."));
                 cnlReader.requestDeviceInfo();