using | MQTT_NS::v5::property_variant = variant< property::payload_format_indicator, property::message_expiry_interval, property::content_type, property::response_topic, property::correlation_data, property::subscription_identifier, property::session_expiry_interval, property::assigned_client_identifier, property::server_keep_alive, property::authentication_method, property::authentication_data, property::request_problem_information, property::will_delay_interval, property::request_response_information, property::response_information, property::server_reference, property::reason_string, property::receive_maximum, property::topic_alias_maximum, property::topic_alias, property::maximum_qos, property::retain_available, property::user_property, property::maximum_packet_size, property::wildcard_subscription_available, property::subscription_identifier_available, property::shared_subscription_available > |