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What is the sensor/protocol used in GSN?

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What is the sensor/protocol used in GSN?

(a) HTTP protocol

(b) CoAP protocol

(c) MQTT protocol

(d) XMPP protocol

The question was asked during an interview.

My doubt is from Open IoT Architecture topic in division IoT Ecosystem Concepts and Architecture of IOT

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The correct choice is (b) CoAP protocol

Easy explanation: Constrained Application Protocol is a specialized web transfer protocol which enables constrained devices to communicate over internet and it is required for GSN in transferring data stream.

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