MQTT Client connect to Azure IoTHub "IndexError: bytes index out of range" error

[sw-dev-code]

What are the steps to reproduce this issue?

1. Connect to WiFi network
2. Call MQTTClient(...) with Azure IoTHub credentials.
3. Call client.connect().

What happens?

Following error appears:

Traceback (most recent call last):
File "main.py", line 45, in
File "/flash/lib/mqtt.py", line 85, in connect
IndexError: bytes index out of range

What were you expecting to happen?

I'm expecting successfully MQTT connect to Azure IoTHub.

What versions of software are you using?

(sysname='LoPy4', nodename='LoPy4', release='1.18.1.r7', version='v1.8.6-849-d1c5ea9 on 2018-12-17', machine='LoPy4 with ESP32', lorawan='1.0.2', sigfox='1.0.1')

[sw-dev-code]

Any updates on this issue?