eclipse-paho / eclipse-paho/paho.mqtt.java
MqttClient create 2 channels per connection
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Description
I'm creating ~255 threads each publishing to RabbitMQ. I noticed the number of channels double number of connection (510)

When I go to channels tab view, I noticed it looks like there's 2 channels per connection, one with prefech = 10. Why are there 2 channels per client? Why a publishing client has the prefetch setting? Is this normal behavior?

**I'm using org.eclipse.paho.client.mqttv3 version 1.1.0**
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