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