hidapi_issue.rs

pub struct UsbContext {
    api: hidapi::HidApi,
}

impl UsbContext {
    pub fn new() -> UsbContext {
        UsbContext {
            api: hidapi::HidApi::new().unwrap()
        }
    }
      
}

fn this_works() {
  {
    let usb = UsbContext::new();
    // my code to switch mode
  }
  
  let usb = UsbContext::new();
  // code to send msg
}

fn this_fails() {  
  let usb = UsbContext::new();
  // my code to switch mode
  // code to send msg
}