Function mraa_sys::mraa_uart_data_available

pub unsafe extern "C" fn mraa_uart_data_available(
    dev: mraa_uart_context, 
    millis: c_uint
) -> mraa_boolean_t

Check to see if data is available on the device for reading

@param dev uart context @param millis number of milliseconds to wait, or 0 to return immediately @return 1 if there is data available to read, 0 otherwise