A. Are you interested in developing software for the Yuneec H520? Here is the link to their SDK (Software Development Kit) portal.
B. Warning about ADVANCED MENU in ST16s. There exists internet information on accessing and using the Advanced Menu in the ST16s. DO NOT do this except under the direct direction of authorized Yuneec Techs. It is all too easy to make accidental changes that brick or crash the craft. Warranty will not cover this.
If you see this screen, back out or immediately turn off the ST16s.