From 13801af75e4b8d2554f753b1d2cc1dafc89fd8c6 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Thu, 19 Nov 2020 22:51:43 -0800
Subject: Fix message acknowledgement

---
 src/main/java/org/traccar/protocol/TaipProtocolDecoder.java | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/main/java/org/traccar/protocol/TaipProtocolDecoder.java b/src/main/java/org/traccar/protocol/TaipProtocolDecoder.java
index 285e68ddd..0878e65af 100644
--- a/src/main/java/org/traccar/protocol/TaipProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/TaipProtocolDecoder.java
@@ -307,8 +307,13 @@ public class TaipProtocolDecoder extends BaseProtocolDecoder {
         if (deviceSession != null) {
             if (channel != null) {
                 if (messageIndex != null) {
-                    String response = ">ACK;ID=" + uniqueId + ";" + messageIndex + ";*";
-                    response += String.format("%02X", Checksum.xor(response)) + "<";
+                    String response;
+                    if (messageIndex.startsWith("#IP:")) {
+                        response = ">SAK;ID=" + uniqueId + ";" + messageIndex + "<";
+                    } else {
+                        response = ">ACK;ID=" + uniqueId + ";" + messageIndex + ";*";
+                        response += String.format("%02X", Checksum.xor(response)) + "<";
+                    }
                     channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
                 } else {
                     channel.writeAndFlush(new NetworkMessage(uniqueId, remoteAddress));
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