Initial release

src/org/traccar/client/Protocol.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2012 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 java.util.Formatter;
+import android.location.Location;
+
+/**
+  * Protocol formatting
+  */
+public class Protocol {
+
+    /**
+     * Format device id message
+     */
+    public static String createId(String id) {
+        StringBuilder s = new StringBuilder("$PGID,");
+        Formatter f = new Formatter(s);
+
+        s.append(id);
+
+        byte checksum = 0;
+        for (byte b : s.substring(1).getBytes()) {
+            checksum ^= b;
+        }
+        f.format("*%02x\r\n", (int) checksum);
+
+        return s.toString();
+    }
+
+    /**
+     * Format location message
+     */
+    public static String createNmea(Location l) {
+        StringBuilder s = new StringBuilder("$GPRMC,");
+        Formatter f = new Formatter(s);
+
+        f.format("%1$tH%1$tM%1$tS.%1$tL,A,", l.getTime());
+
+        double lat = l.getLatitude();
+        double lon = l.getLongitude();
+        f.format("%02d%07.4f,%c,", (int) Math.abs(lat), Math.abs(lat) % 1 * 60, lat < 0 ? 'S' : 'N' );
+        f.format("%03d%07.4f,%c,", (int) Math.abs(lon), Math.abs(lon) % 1 * 60, lon < 0 ? 'W' : 'E' );
+
+        f.format("%.2f,%.2f,", l.getSpeed(), l.getBearing());
+        f.format("%1$td%1$tm%1$ty,,", l.getTime());
+
+        byte checksum = 0;
+        for (byte b : s.substring(1).getBytes()) {
+            checksum ^= b;
+        }
+        f.format("*%02x\r\n", (int) checksum);
+
+        return s.toString();
+    }
+}
+