Unexpected behaviour when subscribing to same topic regular and $shared

hivemq / hivemq-mqtt-client

HiveMQ MQTT Client is an MQTT 5.0 and MQTT 3.1.1 compatible and feature-rich high-performance Java client library with different API flavours and backpressure support

https://hivemq.github.io/hivemq-mqtt-client/

Apache License 2.0

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Unexpected behaviour when subscribing to same topic regular and $shared #636

Open HerrDerb opened 1 week ago

HerrDerb commented 1 week ago

🐛 Bug Report

When subscribing to a topic once normal and once as shared, the incoming messages are notified twice for each subscription.

🔬 How To Reproduce

Subscribe to topics:

myTopic
$shared/group1/myTopic

Send message on topic myTopic Each subscription will be notified twice.

📈 Expected behavior

Expected would be on invocation of each subscription.

📎 Additional context

Version: 1.3.3