This is what I got from Sensi team last week. Good news is they are working on it… bad news is the dreaded no time table comment.
Thank you for contacting Sensi Technical Support. Our developers have advised us that we are currently completely rebuilding our current API to make it more open and more compatible with contemporary home automation platforms like SmartThings and IFTTT, etc. Unfortunately the work isn’t finished yet, but when we are finished we will probably publish information on how we are going to allow others to integrate with our API. We currently do not have an estimated time when this will be possible.
We hope this information helps. If you have any other comments or questions, please contact us via e-mail or give our Sensi Technical Support team a call at 1-888-605-7131, 7:00am – 7:00pm CST, Monday-Friday, and 8:00am – 6:00pm CST Saturday-Sunday. Thank you again, and have a great day!
Sensi Support Team