Increase keep alive for connections

app/src/main/AndroidManifest.xml

@@ -14,7 +14,8 @@
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
-        android:theme="@style/TraccarTheme">
+        android:theme="@style/TraccarTheme"
+        android:name=".MainApplication">
 
         <activity android:name=".MainActivity" android:launchMode="singleTask" />
 

app/src/main/java/org/traccar/client/MainApplication.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2016 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * 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 org.traccar.client;
+
+import android.app.Application;
+
+public class MainApplication extends Application {
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        System.setProperty("http.keepAliveDuration", String.valueOf(30 * 60 * 1000));
+    }
+
+}