Summary: After planning a new flight, the DD app would not recognize that my Mavic was connected. Why not?
Extended:- Flew this drone (Mavic Pro) for the first time at Baylands Park in Santa Clara.
Started up the DD app, centered on current location, and created a new flight plan with maybe an acre of coverage. Only the Save icon was showing. See this image as an example: https://www.dropbox.com/s/aee8b3lp7ixfqed/DD%20no%20connected%20drone.png?dl=0 .
Could not get the Save icon to turn into the Fly icon. Tried:
The next day, well away from Baylands, I could connect, plan a flight, and fly with no problem.
DD app version 2.00-2.0.29iOS 10.2.1
Perhaps it was because you were within the Enhanced Warning Zone for San Jose International Airport? Not saying for sure, just tossing an idea out there.
I'd guess the same thing, and that's where I'd start looking in the code, but as it stands the message is both: a) not meaningful, and b) impossible to get around. At least in DJI Go I can click through to disable the No Fly Zone warning.