Demonstration of usbip timing issue

[manna-harbour]

This is a demonstration of the usbip timing issue from zmkfirmware/zmk#1444.

https://github.com/manna-harbour/xmk/blob/main/src/recordings/delay-test is sythetic recording created by https://github.com/manna-harbour/xmk/blob/main/src/delay-test designed to be be played back with the default keymap.

x, Space, and Enter are tapped with a 100ms delay between press and release. On each line, . and / are tapped with a variable delay between press and release, starting with 0ms on the first line, increasing by 10ms for each line, and ending with 100ms on the last line.

Using the xmk shield the output is:

x ./././././ x
x ./././././ x
x ./././././ x
x ./././././ x
x ./././././ x
x ./././././ x
x ./././././ x
x ./././././ x
x ./././././ x
x ./././././ x
x ./././././ x

Here are 3 sample runs with the native_posix_64 board:

x /../ x
x /././ x
x  x
x ././././ x
x ././.// x
x ./../././ x
x .././././ x
x .//./././ x
x ./././././ x
x ./././././ x
x ./././././ x

x .//. x
x ./././ x
x ./././././ x
x ././/./ x
x ./././. x
x ././/././ x
x ./././../ x
x ./././././ x
x ./././././ x
x ./././././ x
x ./././././ x

x ././ x
x ./././ x
x  x
x ./././ x
x ./.././ x
x /././../ x
x ././/././ x
x /././././ x
x ./././././ x
x ./././././ x
x ./././././ x

Taps with a delay of less than 80ms are not reliably received.