Warning as of February 27th, 2018 - Rachio has apparently started throttling API requests which may cause the plugin to fail. The issues have been addressed in v1.1.3 of the plugin available in the Plugin Store. We highly recommend that everyone upgrade to v1.1.3 or later to avoid issues. Also, check out the docs for the plugin to learn about some new Events you can use to be notified when there are communication and control issues.
We've also created a sub-forum for the Rachio plugin and we've locked this topic. If you have any questions, start a new topic instead. This will help others more easily find answers to questions they may have.
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This plugin integrates the Rachio sprinkler controllers into Indigo as a standard Indigo Sprinkler. The plugin is hosted on our Github account - check out the repository for details on how to install and use the plugin and you can also download the latest release from there.
I've tested this plugin against the 16-zone controller so I'm pretty confident that it will handle any number of zones up to 16. However, I haven't yet installed it permanently at my home, so it hasn't really been fully tested under normal working conditions. I intend to do that install this weekend (4/29/2017) so it should get a better workout after that. If anyone already has one give it a try and let me know if you have any issues.