How to toggle light on and off , between Cayenne app and momentary switch, for home automation?

FAQ's
3

OR use the brilliant solution

offered by @joaoduarte_89

-using a remote GPIO-out pin
to toggle a remote associated GPIO-in.
that, in turn, sends an “off”,
and you have a momentary contact!

Here’s a video

showing the “software” 3-way switch.
Either the physical switch or the Cayenne can control the light-

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