ndf-zz

Broken messages generator with client context re-use

2

Hi, the client context reconnect example in [reconnection.html](https://sbtinstruments.github.io/aiomqtt/reconnection.html) does not work as expected in my testing due to what looks like reuse of an invalidated messages generator. To see the...

Convert to PEP 517 style build

Replace telnetlib with plain socket, opened with create_connection.