Focused a little too much on telephone history, though some was interesting. Perhaps spread out to other modules as short background material.Would have preferred history/overview from Internet age with focus on various protocols/technologies that were introduced (IP, TCP, UDP, MQTT, Thread, Bluetooth, ZigbeeModule 6 made up for its more dynamic and more germane presentation. May be make it the 1st module, with other modules going back for a brief historical overview
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