MQTT subscriber connect failed

[klhappy]

1. chossing mqtt 3.1.1 in mqtt configuration
2. clicking the “connect” button
3. a waring is happen，“client disconnected.Maybe a problem with authentication”
   but chossing mqtt5 is OK

[facontidavide]

give me very specific way to reproduce this or I will not be able to help you

[klhappy]

give me very specific way to reproduce this or I will not be able to help you

software environment：

1. installed “mosquitto-2.0.22-install-windows-x64.exe”，used default settings
2. installed “PlotJuggler-3.11.1-Windows-x64.exe”，and run it.
3. stream configurations：MQTT Subscriber(Mosquitto), host: 127.0.0.1, port:1883, user name and password is empty, MQTT 3.1.1,disable SSL
4. clicked connect button,and then a connection lost waring is popup.