This is how the America treats its engineers. You can bet the Chinese don't have to deal with this bullshit.

“Sir, this is an improvised electronic device. You will never be allowed to fly with this.”

I responded to many questions with information about my occupation, circuit theory up to and including Ohm’s law, and a discussion of the market for bicycle power meters. But they still would not let me fly with the programmer. I had to leave it behind.