![]() This is especially important because a subscribed device might be offline when another device publishes a message that it’s interested in. Much of this PubSub messaging happens asynchronously, because a constrained IoT device does not want to spend its limited resources waiting to ensure that all of the subscribed devices, applications, and systems receive a copy. When a device or application publishes a message, the applications with matching subscriptions receive their own copy of the message. With AWS IoT Core, your devices and applications connect and can subscribe to PubSub message topics. With a durable queue, your request can be re-driven if your function fails the first time. Lambda makes sure that your function is run, even in the face of server failures, so it needs a durable queue in which to store your request.
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