Function bulk_transfer 

pub fn bulk_transfer(
    fd: Fd,
    endpoint: u32,
    data: &mut [u8],
    timeout: u32,
) -> Result<usize>

Make a bulk transfer on the hid fd specified by fd at endpoint, data is either an input or output buffer, timeout is specified in milliseconds.

Errors

Various ioctl errors, like a bad fd, bad endpoint, buffer too small etc.