Flash your hue lights on and off

hue.sh

#!/usr/bin/env bash

# WARNING: THIS ACTUALLY MADE ME FEEL A BIT SICK. Maybe make the sleeps longer below before you try this out

set -euo pipefail
IFS=$'\n\t'

HUE_IP=$(curl https://www.meethue.com/api/nupnp 2> /dev/null | cut -d '"' -f 8)

function create-hue-user() {
  curl \
    --request POST \
    --header "Accept: application/json" \
    --data '{"devicetype":"my_hue_app#andrew"}' \
    "http://$HUE_IP/api"
}

if [[ ! -f "hue-api-key" ]]; then
  RESULT=$(create-hue-user)
  if [[ "$RESULT" =~ "link button not pressed" ]]; then
    echo
    echo "Press the button on the Hue hub and then press ENTER..."
    read
  fi
  KEY=$(create-hue-user | cut -d '"' -f 6)
  echo "$KEY" > "hue-api-key"
fi

KEY=$(cat "hue-api-key")

function set-brightness() {
  for light in $(seq 1 2); do
    curl \
      --request PUT \
      --header "Accept: application/json" \
      --data '{"on": true, "bri": '"$1"'}' \
      "http://$HUE_IP/api/$KEY/lights/$light/state"
  done
}

for x in $(seq 1 100); do
  set-brightness 100
  sleep 0.5
  set-brightness 150
  sleep 0.5
done