See this thread for details:
Although note that we are moving to a new API, with XTRX being the first board to support this. A backwards compatibility wrapper is being developed to enable existing LMS API enabled apps to be used without being updated, and I don’t think that has been released just yet, but should be very soon. As we put the final touches on this and work towards a release, we likely won’t have time to support users who are flashing gateware to old Fairwaves boards and building apps against a moving target 