From 6cb4db1f6bb4f93ad42b013a38ace9a6a3b735f6 Mon Sep 17 00:00:00 2001
From: seym45 <seym45@gmail.com>
Date: Mon, 24 Jul 2023 01:25:05 +0400
Subject: Define command 'rollback'

---
 src/main/java/org/traccar/model/Command.java       |  1 +
 .../java/org/traccar/protocol/GatorProtocol.java   |  5 +++
 .../org/traccar/protocol/GatorProtocolEncoder.java | 52 ++++++++++++++++++++++
 3 files changed, 58 insertions(+)
 create mode 100644 src/main/java/org/traccar/protocol/GatorProtocolEncoder.java

diff --git a/src/main/java/org/traccar/model/Command.java b/src/main/java/org/traccar/model/Command.java
index 99988dd82..e0c1c3976 100644
--- a/src/main/java/org/traccar/model/Command.java
+++ b/src/main/java/org/traccar/model/Command.java
@@ -45,6 +45,7 @@ public class Command extends BaseCommand {
     public static final String TYPE_SILENCE_TIME = "silenceTime";
     public static final String TYPE_SET_PHONEBOOK = "setPhonebook";
     public static final String TYPE_MESSAGE = "message";
+    public static final String TYPE_ROLLCALL = "rollcall";
     public static final String TYPE_VOICE_MESSAGE = "voiceMessage";
     public static final String TYPE_OUTPUT_CONTROL = "outputControl";
     public static final String TYPE_VOICE_MONITORING = "voiceMonitoring";
diff --git a/src/main/java/org/traccar/protocol/GatorProtocol.java b/src/main/java/org/traccar/protocol/GatorProtocol.java
index 7341b69a3..c54b1b53d 100644
--- a/src/main/java/org/traccar/protocol/GatorProtocol.java
+++ b/src/main/java/org/traccar/protocol/GatorProtocol.java
@@ -20,6 +20,7 @@ import org.traccar.BaseProtocol;
 import org.traccar.PipelineBuilder;
 import org.traccar.TrackerServer;
 import org.traccar.config.Config;
+import org.traccar.model.Command;
 
 import javax.inject.Inject;
 
@@ -27,10 +28,14 @@ public class GatorProtocol extends BaseProtocol {
 
     @Inject
     public GatorProtocol(Config config) {
+        setSupportedDataCommands(
+                Command.TYPE_ROLLCALL
+        );
         addServer(new TrackerServer(config, getName(), false) {
             @Override
             protected void addProtocolHandlers(PipelineBuilder pipeline, Config config) {
                 pipeline.addLast(new LengthFieldBasedFrameDecoder(1024, 3, 2));
+                pipeline.addLast(new GatorProtocolEncoder(GatorProtocol.this));
                 pipeline.addLast(new GatorProtocolDecoder(GatorProtocol.this));
             }
         });
diff --git a/src/main/java/org/traccar/protocol/GatorProtocolEncoder.java b/src/main/java/org/traccar/protocol/GatorProtocolEncoder.java
new file mode 100644
index 000000000..452fde275
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/GatorProtocolEncoder.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2023 - Hossain Mohammad Seym
+ *
+ * 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 io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import org.traccar.BaseProtocolEncoder;
+import org.traccar.Protocol;
+import org.traccar.config.Keys;
+import org.traccar.helper.Checksum;
+import org.traccar.helper.model.AttributeUtil;
+import org.traccar.model.Command;
+import org.traccar.model.Device;
+
+import java.nio.charset.StandardCharsets;
+
+public class GatorProtocolEncoder extends BaseProtocolEncoder {
+
+    public GatorProtocolEncoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    private ByteBuf encodeContent(long deviceId, String content) {
+        // FIXME: implement this method
+        return  null;
+    }
+
+    @Override
+    protected Object encodeCommand(Command command) {
+
+        switch (command.getType()) {
+            case Command.TYPE_ROLLCALL:
+                return encodeContent(command.getDeviceId(), "0x30");
+            default:
+                return null;
+        }
+    }
+
+}
-- 
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