From 7d1a552cde17a93f14451b7fb34c5f4e450030bd Mon Sep 17 00:00:00 2001
From: Michael Zillgith <michael.zillgith@mz-automation.de>
Date: Sat, 4 Jan 2020 17:18:04 +0100
Subject: [PATCH] - GOOSE publisher: fixed problem with overflow of stNum and
 sqNum (see #199)

---
 src/goose/goose_publisher.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/goose/goose_publisher.c b/src/goose/goose_publisher.c
index 4ba245da..4540e487 100644
--- a/src/goose/goose_publisher.c
+++ b/src/goose/goose_publisher.c
@@ -159,6 +159,11 @@ GoosePublisher_increaseStNum(GoosePublisher self)
     MmsValue_setUtcTimeMs(self->timestamp, currentTime);
 
     self->stNum++;
+
+    /* check for overflow */
+    if (self->stNum == 0)
+        self->stNum = 1;
+
     self->sqNum = 0;
 
     return currentTime;
@@ -387,11 +392,14 @@ GoosePublisher_publish(GoosePublisher self, LinkedList dataSet)
 
     int32_t payloadLength = createGoosePayload(self, dataSet, buffer, maxPayloadSize);
 
-    self->sqNum++;
-
     if (payloadLength == -1)
         return -1;
 
+    self->sqNum++;
+
+    if (self->sqNum == 0)
+        self->sqNum = 1;
+
     int lengthIndex = self->lengthField;
 
     size_t gooseLength = payloadLength + 8;