demonstratation of the functionality of the knock box prototype objects in the project Touching at a Distance.
if you knock a series of knocks on your box, my box will repeat that series. I can reply with knocks on my box that you will hear coming from your box
The knock boxes are connected together over internet. The objects are not connected to a computer, but are esp32 microcontrollers (huzzah32 from Adafruit) that connect directly to the MQTT message server on internet.
In practical use the objects would be in separate locations, so a remote action would trigger a local response.
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