Nest Automatic Humidity Control

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I was able to get this working on hassio with extra steps:

  • First, you need to access the bash shell of the homeassistant container. Protip: How to get shell in actual homeassistant (or addon) container when using Hassio
  • Then run apk add php8 and apk add php8-curl to install php8 (with curl extension) into the homeassistant container. php8 comes with the json extension by default.
  • Download “nest.class.php”, “update_nest_target_humidity.php”, and “nest-api-php-workaround-login.php” (Manually create cache file required for nest-api to work with Nest accounts (not Google accounts). Ref: https://github.com/gboudreau/nest-api/issues/110 · GitHub) to your local machine.
  • Create “/config/custom_scripts” folder on your hassio instance
  • Edit “nest.class.php”. This fools nest to see your automation as a web browser client instead of a curl client. This also moves the temp cookie files to a persistent location “/config/custom_scripts”
    • line 1474: curl_setopt($ch, CURLOPT_USERAGENT, 'YOUR_USERAGENT_STRING');
    • line 128: $file = "/config/custom_scripts/nest_php_{$type}_{$suffix}";
    • line 137: $file = "/config/custom_scripts/nest_php_{$type}_{$unix_user}_{$suffix}";
  • Edit “update_nest_target_humidity.php”. Specifies your credentials and changes the library path to the same location as this file
    • line 6: fill in your username
    • line 7: fill in your password
    • line 3: require_once dirname(__FILE__) . '/nest.class.php';
  • Edit “nest-api-php-workaround-login.php”. This puts in your credentials so that you don’t need to enter them everytime this script is executed. This updates the cache file location to /config/custom_scripts/ instead so that it’s persistent across home assistant reboots.
    • line 11: $username = 'YOUR_USERNAME_HERE';
    • line 12: $password = 'YOUR_PASSWORD_HERE';
    • line 14: $cache_file = '/config/custom_scripts/nest_php_cache_' . md5($username . $password);
  • Upload the files to /config/custom_scripts
  • Run /usr/bin/php8 /config/custom_scripts/nest-api-php-workaround-login.php from the bash shell prompt in the homeassistant container to generate the session cookie (will need to repeat this on a monthly cadence). Follow the steps from the script prompt
  • Run /usr/bin/php8 /config/custom_scripts/update_nest_target_humidity.php -10 35 to verify that it runs without an error
  • Update the shell command to use php8 and run from /config/custom_scripts/
    • update_nest_target_humidity: '/usr/bin/php8 /config/custom_scripts/update_nest_target_humidity.php {{states.sensor.dark_sky_temperature.state}} {{states.sensor.dark_sky_humidity.state}}'