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ESP32 as Bluetooth Keyboard

With its built-in Bluetooth capabilities, the ESP32 can act as a Bluetooth keyboard. The below code is a minimal example of how to achieve it. It will generate the key strokes for a message whenever a button attached to the ESP32 is pressed.

For the example setup, a momentary button should be connected to pin 2 and to ground. Pin 2 will be configured as an input with pull-up.

In order to receive the message, add the ESP32 as a Bluetooth keyboard of your computer or mobile phone:

Go to your computers/phones settings
Ensure Bluetooth is turned on

	#!/usr/bin/env bash

	# * https://developer.android.com/reference/android/view/KeyEvent#constants
	# * https://developer.amazon.com/appsandservices/solutions/devices/fire-tv/docs/amazon-fire-tv-remote-input
	# * ----------------------------------------------------------------------------------------------------
	# * \| \| (KEYCODE_MEDIA_RECORD) \| \|
	# * ----------------------------------------------------------------------------------------------------
	# * \| \|
	# * ----------------------------------------------------------------------------------------------------
	# * \| \| KEYCODE_DPAD_UP \| \|

	#!/us#!/usr/bin/env bash

	# This script uses a shallow-get technique to get a list of all top level keys
	# in a Firebase Realtime Database, then extract the tree under each key into a
	# separate JSON file, one per top level key.
	#
	# It’s great for making backups because you don’t end up with one ginormous
	# export file which is really hard to manage with other tools.
	#
	# It can also immediately give you a sense of where your space is going per key,