add preference for backend debug

res/values/strings.xml

@@ -159,6 +159,8 @@
 <string name="p_conntype_entry">Choose the connection protocol</string>
 <string name="p_connsetup">Connection Preferences</string>
 <string name="p_connsetup_summary">Configuration of Connection</string>
+<string name="p_connlog">Connection Logging</string>
+<string name="p_connlog_summary">Verbose status output in Log</string>
 <!-- array of connection types -->
 <string name="p_conn_tcp">TCP connection</string>
 <string name="p_conn_udp">UDP (send only)</string>

res/xml/preferences.xml

@@ -150,6 +150,10 @@
                     android:targetClass="org.aprsdroid.app.BackendPrefs" />
 
         </PreferenceScreen>
+        <CheckBoxPreference
+                android:key="conn_log"
+		android:title="@string/p_connlog"
+		android:summary="@string/p_connlog_summary" />
     </PreferenceCategory>
 
     <PreferenceCategory