- version update to 2.0.0
- **BREAKING** Added callback_api_version. This break *ALL* users of paho-mqtt Client class.
See migrations.md for details on how to upgrade.
tl; dr; add CallbackAPIVersion.VERSION1 to first argument of Client()
- **BREAKING** Drop support for Python 2.7, Python 3.5 and Python 3.6
Minimum tested version is Python 3.7
Python version up to Python 3.12 are tested.
- **BREAKING** connect_srv changed it signature to take an additional bind_port parameter.
This is a breaking change, but in previous version connect_srv was broken anyway.
Closes #493.
- **BREAKING** Remove some deprecated argument and method:

* ``max_packets`` argument in loop(), loop_write() and loop_forever() is removed
* ``force`` argument in loop_stop() is removed
* method ``message_retry_set()`` is removed
- **BREAKING** Remove the base62, WebsocketWrapper and ConnectionState, as user shouldn't directly use them.
- Possible breaking change: Add properties to access most Client attribute. Closes #764.
Since this add new properties like `logger`, if a sub-class defined `logger`, the two `logger`
will conflict.
- Add version 2 of user-callback which allow to access MQTTv5 reason code & properties that were
missing from on_publish callback. Also it's more consistent in parameter order or between
MQTTv3 and MQTTv5.
- Add types to Client class, which caused few change which should be compatible.
Known risk of breaking changes:
- Use enum for returned error code (like MQTT_ERR_SUCCESS). It use an IntEnum
which should be a drop-in replacement. Excepted if someone is doing "rc is 0" instead of "rc == 0".
- reason in on_connect callback when using MQTTv5 is now always a ReasonCode object. It used to possibly be
an integer with the value 132.
- MQTTMessage field "dup" and "retain" used to be integer with value 0 and 1. They are now boolean.
- Add support for ALPN protocols on TLS connection. Closes #790 & #648.