Function esp_idf_sys::uart_read_bytes

pub unsafe extern "C" fn uart_read_bytes(
    uart_num: uart_port_t, 
    buf: *mut u8, 
    length: u32, 
    ticks_to_wait: TickType_t
) -> c_int

@brief UART read bytes from UART buffer

@param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2 @param buf pointer to the buffer. @param length data length @param ticks_to_wait sTimeout, count in RTOS ticks

@return - (-1) Error - OTHERS (>=0) The number of bytes read from UART FIFO