Retrieves the value of a specific property from the last CONNACK packet received.

template <
    prop::property_type p
>
const auto & connack_property(
    std::integral_constant< prop::property_type, p > prop
) const;

Description

The return type varies according to the property requested. For all properties, the return type will be std::optional of their respective value type. For async_mqtt5::prop::user_property, the return type is std::vector<std::pair<std::string, std::string>>.

Parameters

Example

std::optional<std::string> auth_method = client.connack_property(async_mqtt5::prop::authentication_method); // ok
std::optional<std::string> c_type = client.connack_property(async_mqtt5::prop::content_type); // does not compile, not a CONNACK prop!

See More

See async_mqtt5::connack_props for all eligible properties.