MQTT with Certificate not working

[markweber]

Dear Community,

I am just using a GPy with a Pysense and I would like to publish messages via MQTT to a broker. Without TLS it is working fine, messages are published to the broker.
When i am now using SSL, I get errors, which i cannot interpret.

first my snippet of code:

CERT_PATH = '/flash/cert/mqtt.pem'
client = MQTTClient("PyCOM", "XXX.XXX.XXX.XXX", port=8883, user="XXX", password="XXX", ssl=True, ssl_params={'cert_reqs':ssl.CERT_REQUIRED,'certfile':CERT_PATH})

I get this error:

Traceback (most recent call last):
  File "<stdin>", line 26, in <module>
  File "/flash/lib/mqtt.py", line 59, in connect
ValueError: invalid argument(s) value
>```

do you have any idea?

Thanks in advance.