Merge pull request #236 from halfgaar/fix-packetid-zero

Fix publishing packet ID zero on wrap-around
emqx · Feb 14, 2022 · 0bd198e · 0bd198e
2 parents 4edfd85 + abc31a1
commit 0bd198e
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/src/mqtt/qmqtt_client_p.cpp b/src/mqtt/qmqtt_client_p.cpp
@@ -335,7 +335,12 @@ void QMQTT::ClientPrivate::stopKeepAlive()
 
 quint16 QMQTT::ClientPrivate::nextmid()
 {
-    return _gmid++;
+    const quint16 result = _gmid;
+    _gmid++;
+    if (_gmid == 0)
+      _gmid++;
+
+    return result;
 }
 
 quint16 QMQTT::ClientPrivate::publish(const Message& message)