for many years I am using the hid.c code from the teensy website to communicate with teensy2 to teensy3.6 from MacOS.
With MaOS 10.15 Catalina this is no longer possible because of enhanced security standards.
Has anyone tried that?
For many years, I am working on MacOSX with the USB-Functions provided by John de Witt at https://github.com/jhdewitt/sltk/blob/master/hid_MACOSX.c
with no problems with Teensy2.0 to 3.6.
Now working on Big Sur with Xcode12 I run into troubles getting SIGABTRT's
In my Apps, I try opening the teensy at startup. If it is not already plugged in, the app complains and ask me to plug in the device; after that the teensy gets connected.
With Big Sur, the app crashed in that case with SIGABRT in rawhid_open on the line: