Access the value of Session Expiry Interval.

[redboltz]

Access the value of Session Expiry Interval.

[redboltz]

props is std::vector<async_mqtt::property_varinat>, so p is a reference of aync_mqtt::property_variant.
property_variant has the following interface:
https://redboltz.github.io/async_mqtt/doc/latest/html/classasync__mqtt_1_1property__variant.html

You have two choices. One is using visit() function. The other is get() function.

1

Here is visit() code:

async_mqtt/include/async_mqtt/broker/broker.hpp

Lines 293 to 306 in dd87e37

	for (auto const& prop : props) {
	prop.visit(
	overload {
	[&](property::session_expiry_interval const& v) {
	if (v.val() != 0) {
	session_expiry_interval.emplace(std::chrono::seconds(v.val()));
	}
	},
	[&](property::request_response_information const& v) {
	response_topic_requested = v.val();
	},
	[&](auto const&) {}
	}
	);

2

get() is used with template argument.

auto const& sei_prop = p.get<async_mqtt::property::session_expiry_interval>();
sei_prop.val(); // access

[magni-mar]

thank you for a quick response, I will use the second one as it is more fitting for my use case.