Huabao Protocol: Add CC888 heartbeat packet

From CC888 protocol

When vehicle engine is OFF, the device will stop uploading location information to platform
server, it will send heart beat message to platform server every 2 minutes, the heart beat
message ID is 0x0506, the message body of heart beat message is empty.
The platform will reply device with general replay message ID 0x8001

src/main/java/org/traccar/protocol/HuabaoProtocolDecoder.java

@@ -51,6 +51,7 @@ public HuabaoProtocolDecoder(Protocol protocol) {
     public static final int MSG_GENERAL_RESPONSE = 0x8001;
     public static final int MSG_GENERAL_RESPONSE_2 = 0x4401;
     public static final int MSG_HEARTBEAT = 0x0002;
+    public static final int MSG_HEARTBEAT_2 = 0x0506;
     public static final int MSG_TERMINAL_REGISTER = 0x0100;
     public static final int MSG_TERMINAL_REGISTER_RESPONSE = 0x8100;
     public static final int MSG_TERMINAL_CONTROL = 0x8105;
@@ -224,7 +225,7 @@ protected Object decode(
                         formatMessage(MSG_TERMINAL_REGISTER_RESPONSE, id, false, response), remoteAddress));
             }
 
-        } else if (type == MSG_TERMINAL_AUTH || type == MSG_HEARTBEAT || type == MSG_PHOTO) {
+        } else if (type == MSG_TERMINAL_AUTH || type == MSG_HEARTBEAT || type == MSG_PHOTO || type == MSG_HEARTBEAT_2) {
 
             sendGeneralResponse(channel, remoteAddress, id, type, index);