From e742f252da0b32ac7166c6d9ab25a8d1375411d2 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Thu, 3 Nov 2022 20:36:25 -0700
Subject: Add MD500S heartbeat response

---
 .../java/org/traccar/protocol/MeitrackProtocolDecoder.java  | 13 ++++++++++---
 .../org/traccar/protocol/MeitrackProtocolDecoderTest.java   |  3 +++
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/main/java/org/traccar/protocol/MeitrackProtocolDecoder.java b/src/main/java/org/traccar/protocol/MeitrackProtocolDecoder.java
index 736f5871c..1935b2c2a 100644
--- a/src/main/java/org/traccar/protocol/MeitrackProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/MeitrackProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 - 2021 Anton Tananaev (anton@traccar.org)
+ * Copyright 2012 - 2022 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.
@@ -538,13 +538,13 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
         return positions;
     }
 
-    private void requestPhotoPacket(Channel channel, SocketAddress socketAddress, String imei, String file, int index) {
+    private void requestPhotoPacket(Channel channel, SocketAddress remoteAddress, String imei, String file, int index) {
         if (channel != null) {
             String content = "D00," + file + "," + index;
             int length = 1 + imei.length() + 1 + content.length() + 5;
             String response = String.format("@@O%02d,%s,%s*", length, imei, content);
             response += Checksum.sum(response) + "\r\n";
-            channel.writeAndFlush(new NetworkMessage(response, socketAddress));
+            channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
         }
     }
 
@@ -560,6 +560,13 @@ public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
         String type = buf.toString(index + 1, 3, StandardCharsets.US_ASCII);
 
         switch (type) {
+            case "AAC":
+                if (channel != null) {
+                    String response = String.format("@@z27,%s,AAC,1*", imei);
+                    response += Checksum.sum(response) + "\r\n";
+                    channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
+                }
+                return null;
             case "D00":
                 if (photo == null) {
                     photo = Unpooled.buffer();
diff --git a/src/test/java/org/traccar/protocol/MeitrackProtocolDecoderTest.java b/src/test/java/org/traccar/protocol/MeitrackProtocolDecoderTest.java
index 0fc51b8b6..67b83ebd9 100644
--- a/src/test/java/org/traccar/protocol/MeitrackProtocolDecoderTest.java
+++ b/src/test/java/org/traccar/protocol/MeitrackProtocolDecoderTest.java
@@ -129,6 +129,9 @@ public class MeitrackProtocolDecoderTest extends ProtocolTest {
         verifyPositions(decoder, binary(
                 "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"));
 
+        verifyNull(decoder, buffer(
+                "$$z27,861451040910625,AAC,1*D3"));
+
     }
 
 }
-- 
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