Fix generation of packet identifier.

2026-10-20 11:45:43 +08:00 · 2018-02-02 00:46:47 +01:00
parent 5f77255893
commit 26cd84c88c
4 changed files with 71 additions and 11 deletions
@@ -0,0 +1,32 @@
+namespace MQTTnet.Client
+{
+    public class MqttPacketIdentifierProvider
+    {
+        private readonly object _syncRoot = new object();
+        private ushort _value;
+
+        public void Reset()
+        {
+            lock (_syncRoot)
+            {
+                _value = 0;
+            }
+        }
+
+        public ushort GetNewPacketIdentifier()
+        {
+            lock (_syncRoot)
+            {
+                _value++;
+
+                if (_value == 0)
+                {
+                    // As per official MQTT documentation the package identifier should never be 0.
+                    _value = 1;
+                }
+
+                return _value;
+            }
+        }
+    }
+}