Raspberry PI Zero as a HID Keyboard

As root on the pi, running server.py listens on a socket and sends keypresses.

On another computer, running sender.py sends the keystrokes over the socket. Currently only [a-zA-Z0-9] are supported.

Requirements

1. Raspberry Pi Zero
2. Kernel 4.4+
3. Tested on Windows 10 and Ubuntu Gnome 17.04 as the receiving PC

Sources

Starting a script on boot using systemd

Setting up kernel for USB Composite Device

Setup

# Enable Kernel Modules
echo "dtoverlay=dwc2" | sudo tee -a /boot/config.txt
echo "dwc2" | sudo tee -a /etc/modules
echo "libcomposite" | sudo tee -a /etc/modules

# Register script to setup PI as HID device
sudo cp isticktoit_usb /usr/bin/isticktoit_usb
sudo chmod 755 /usr/bin/isticktoit_usb

# Run this script at startup
sudo cp piHID.service /lib/systemd/system/piHID.service
sudo chmod 644 /lib/systemd/system/piHID.service
sudo systemctl daemon-reload
sudo systemctl enable piHID.service

sudo reboot