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InfluxDB
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This is the final version of my HID Cable, a setup I made for my teaching job. It consists of a Pi Pico and a Pi Zero. On the Zero end, a soldered on USB C cable provides power and a wired USB Ethernet gadget local network connection from the connected iPad Pro. The iPad has a ton of Shortcuts (automation app) set up with predefined feedback comments that I can trigger with keyboard shortcuts in order to copy to the clipboard, normally used to insert into student work I grade. A second keyboard shortcut however grabs the clipboard and uses HTTP POST to the Pi's hostname, where it's running a Flask server. The Flask script compensates for any odd characters that the Pico end doesn't support before sending it over UART to the Pico. The Pico is connected to any other device that supports USB keyboards and acts like one, receiving the text over UART and typing it out as if it were a keyboard. This is fairly standard CircuitPython HID with a Norwegian layout.