From 7fc40b50d77b5724473ffd91e8d1b00418c27cc2 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Mon, 20 Mar 2017 04:08:53 +1300
Subject: Alternative TAIP acknowledgement

---
 src/org/traccar/protocol/TaipProtocolDecoder.java | 26 ++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

(limited to 'src/org/traccar')

diff --git a/src/org/traccar/protocol/TaipProtocolDecoder.java b/src/org/traccar/protocol/TaipProtocolDecoder.java
index 099ae005d..24fe36220 100644
--- a/src/org/traccar/protocol/TaipProtocolDecoder.java
+++ b/src/org/traccar/protocol/TaipProtocolDecoder.java
@@ -18,6 +18,7 @@ package org.traccar.protocol;
 import org.jboss.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.DeviceSession;
+import org.traccar.helper.Checksum;
 import org.traccar.helper.DateBuilder;
 import org.traccar.helper.DateUtil;
 import org.traccar.helper.Parser;
@@ -135,6 +136,10 @@ public class TaipProtocolDecoder extends BaseProtocolDecoder {
             attributes = sentence.substring(beginIndex, endIndex).split(";");
         }
 
+        String uniqueId = null;
+        DeviceSession deviceSession = null;
+        String messageIndex = null;
+
         if (attributes != null) {
             for (String attribute : attributes) {
                 int index = attribute.indexOf('=');
@@ -144,13 +149,11 @@ public class TaipProtocolDecoder extends BaseProtocolDecoder {
                     switch (key) {
 
                         case "id":
-                            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, value);
+                            uniqueId = value;
+                            deviceSession = getDeviceSession(channel, remoteAddress, value);
                             if (deviceSession != null) {
                                 position.setDeviceId(deviceSession.getDeviceId());
                             }
-                            if (sendResponse && channel != null) {
-                                channel.write(value);
-                            }
                             break;
 
                         case "sv":
@@ -170,13 +173,26 @@ public class TaipProtocolDecoder extends BaseProtocolDecoder {
                             break;
 
                     }
+                } else if (attribute.startsWith("#")) {
+                    messageIndex = attribute;
                 }
             }
         }
 
-        if (position.getDeviceId() != 0) {
+        if (deviceSession != null) {
+            if (sendResponse && channel != null) {
+                if (messageIndex != null) {
+                    String response = ">ACK;" + messageIndex + ";ID=" + uniqueId + ";";
+                    response += Checksum.nmea(response) + "<";
+                    channel.write(response);
+                } else {
+                    channel.write(uniqueId);
+                }
+            }
+
             return position;
         }
+
         return null;
     }
 
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