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Before connecting the LoRaWAN server to our IoT platform.
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We need to understand who is going to be the subscriber, the publisher, and the broker.
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Actually, it's not that straightforward because there are two possibilities.
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So we'll see both of them on this figure.
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I represent at the top the LoRaWAN server and at the bottom the IoTplatform.
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Most of the time the LoRaWAN server exposes by default a MQTT broker.
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So we don't need to configure anything and the broker is already available and enabled.
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If you want to use it,
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so if a publisher on the subscriber wants to connect to this broker, then we just need to check the
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credentials and the topic hierarchy of this broker.
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Everything is in the documentation of each LoRaWAN server and that is definitely the easiest way to
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proceed.
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So in that case, who is the subscriber and who is the publisher? 
For both its the IoT platform.
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The subscriber on the IoT platform is going to check its favorite topic on the broker, usually the uplink
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stream, and the publisher is going to send messages to the broker, usually messages for the device,
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so the downlink stream.
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The nice thing with this architecture is that we don't need to set up an MQTT broker, but only two
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clients, one subscriber and one publisher.
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We'll make a demonstration for this architecture.
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But before I would like to present you a second architecture that you might find.