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We saw 4 types of messaging schemes that could be used in an IIoT system. 3 of these were: polling, interrupts and push status. A 4th scheme exists, with the MQTT protocol (and related to push status) as one example, and is suitable for systems with thousands of nodes and sensors that require sharing status and/or control information. What is the name of this 4th scheme? (select the correct answer).

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