Connection to two mqtt 5.0 brokers fails

[rafaelnobrekz]

Hello! Thanks for providing CocoaMQTT - I guess the only native Swift MQTT 5.0 client? Trying to run the sample app against the brokers in https://test.mosquitto.org/ fail - I am able to connect but:

• Trying to subscribe to a topic yields an immediate disconnection
• Trying to publish to a topic crashes the library with the following:

I have also tried with a paho based 5.0 broker and the result is the same. The test broker broker-cn.emqx.io referenced in the sample works fine (apart from a "JSON" message prepending every message when version 5.0 is selected).

[rafaelnobrekz]

I can successfully connect/subscribe/publish on all three servers above from the MQTTX Mac client app

[leeway1208]

hi, I will fix it later. I think it is a bug.😄

[rafaelnobrekz]

2.0.3-beta4 fixes the issue! 🎉