From RainMachine wiki page
RainMachine OS v4.0.574 changelog
- Improved developer API test page. - Improved how the minimum temperatures for freeze control are tracked. - Improved water saving for 'every-N days' programs with no internet data when using zone history. - Improved Web UI to allow custom configuration of parsers and user custom parser upload. - Improved cloud client reliability on larger data transfers that occur when requesting 1 year data history from device.