improve loop

[RafaelMarchand]

Provide a boolean feedback whether the loop function was exited after timLimit was exceeded or the queue was empty

[Namoshek]

This change should be non-breaking for normal users but it is breaking for users extending the MqttClient class or interface. I'm fine with that, yet I would suggest not to return a boolean but an enum with the exact reason (there is more than two, and potentially more in the future). That would also require changing the minimum required PHP version to 8.1, which is fine, since 8.0 is EOL anyway.

Do you want to implement those changes or should I?

[RafaelMarchand]

According to chatGPT returning enums would break the code for people that use this library with php <8.1, including my use case. So it might be better to return strings although less clean.

[Namoshek]

I'm not going to sacrifice code quality and maintainability to support a PHP version that is end-of-life for over a year already.

[Namoshek]

I'm going to close this as a solution has been discussed in #200. If I'm ever going to release another major version, I might implement this feature though. The use cases might be rare, but conceivable.