Impossible to connect to MQTT servers

[e.montolivo@gmail.com]

Hi,
which is the broker? I want to check it.

Hi,
the broker is broker.hivemq.com but I experience the same malfunctioning with other brokers and regardless the script I run. 
Even the very basic script at the link below crashes

https://drive.google.com/file/d/1-rRHlqp...sp=sharing

all my scripts that connect to broker.hivemq.com or whatever other one work without issues when I use version 6.0.22.