MQTT::V5::RetainHandling
Inherits Enum / Comparable / Value / Object
MQTT-3.8.3.1. Controls whether retained messages are delivered when a subscription is made
Constants
SendAlways = 0_u8
send retained messages when the subscription is established
SendIfNew = 1_u8
only send them if the subscription did not already exist
Never = 2_u8
never send retained messages for this subscription