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Representation of the Retain Handling Subscribe Option.
Defined in header <boost/mqtt5/types.hpp>
enum class retain_handling_e : std::uint8_t;
Name |
Description |
---|---|
|
Send retained messages at the time of subscribe. |
|
Send retained message only if the Subscription does not currently exist. |
|
Do not send retained messages at the time of subscribe. |
A Subscribe Option specifying whether retained messages are sent when the Subscription is established.
Convenience header <boost/mqtt5.hpp>