It looks like ios11 will be supporting homekit without the need for an MFI chip
`Also new for HomeKit in iOS is software authentication. This is a big deal for older accessories that are already shipping, allowing them to add support for the platform through software without the need for including a hardware authentication chip that Apple previously required.
In addition, Apple is expanding its self-certification process for accessories with a new HomeKit Certification Assistant and more third-party Apple Authorized Labs for testing in the US, China, and the UK.
So based on this new info, is there any chance opensprinkler will be homekit compliant without the need for 3rd party tools