RUI UART Send

RUI_RETURN_STATUS rui_uart_send(RUI_UART_DEF uart_def, uint8_t *pdata, uint16_t len)

@brief	This API is used to send data via UART.
@return	RUI_RETURN_STATUS
@param	RUI_UART_DEF uart_def : the instance of UART. uint8t *pdata : the pointer of data you want to send. uint16_t len : the length of the data.
@module	RAK811, RAK4200, RAK4400, RAK4600, and RAK5010.