Fix: use addition to increase message size #7
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When using a username and password to connect to a broker, the message size has been manipulated using string concatenation instead of mathematical addition. This caused an issue with `chr()` expecting an integer and not a string. It also would have lead to wrong information being sent.
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As pointed out in #6, when using a username and password to connect to a broker, the message size has been manipulated using string concatenation instead of mathematical addition. This caused an issue with
chr()expecting an integer and not a string. It also would have lead to wrong information being sent.