1 files changed, 46 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/PretraceProtocolEncoder.java b/src/main/java/org/traccar/protocol/PretraceProtocolEncoder.java
new file mode 100644
index 000000000..9cf951e3b
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/PretraceProtocolEncoder.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2015 Anton Tananaev (anton@traccar.org)
+ *
+ * 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.protocol;
+
+import org.traccar.BaseProtocolEncoder;
+import org.traccar.Context;
+import org.traccar.helper.Checksum;
+import org.traccar.model.Command;
+
+public class PretraceProtocolEncoder extends BaseProtocolEncoder {
+
+    private String formatCommand(String uniqueId, String data) {
+        String content = uniqueId + data;
+        return String.format("(%s^%02X)", content, Checksum.xor(content));
+    }
+
+    @Override
+    protected Object encodeCommand(Command command) {
+
+        String uniqueId = Context.getIdentityManager().getById(command.getDeviceId()).getUniqueId();
+
+        switch (command.getType()) {
+            case Command.TYPE_CUSTOM:
+                return formatCommand(uniqueId, command.getString(Command.KEY_DATA));
+            case Command.TYPE_POSITION_PERIODIC:
+                return formatCommand(
+                        uniqueId, String.format("D221%1$d,%1$d,,", command.getInteger(Command.KEY_FREQUENCY)));
+            default:
+                return null;
+        }
+    }
+
+}