Cargo Features

mqtt-protocol has no features set by default.

mqtt-protocol = { version = "0.12.0", features = ["tokio-codec"] }
tokio-codec = bytes, tokio, tokio-util

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

tokio tokio-codec?
tokio-util tokio-codec?

Enables tokio-util ^0.6

bytes tokio-codec?