mqrstt 0.4.2

Pure rust MQTTv5 client implementation Smol and Tokio
Documentation 
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pub(crate) const DEFAULT_RECEIVE_MAXIMUM: u16 = 65535;
pub(crate) const MAXIMUM_PACKET_SIZE: u32 = 268435455;
pub(crate) const MAXIMUM_TOPIC_SIZE: usize = 65535;