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const uart_port_t uart_num = UART_NUM_0;

void setup {
// Setup UART
	    uart_config_t uart_config = {
	      .baud_rate = 115200,
	      .data_bits = UART_DATA_8_BITS,
	      .parity = UART_PARITY_ODD,
	      .stop_bits = UART_STOP_BITS_1,
	      .flow_ctrl = UART_HW_FLOWCTRL_DISABLE
	    };
	    ESP_ERROR_CHECK(uart_param_config(uart_num , &uart_config));
	    ESP_ERROR_CHECK(uart_set_pin(uart_num , UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE));   // Set UART pins (using UART0 default pins ie no changes.)
	    ESP_ERROR_CHECK(uart_driver_install(uart_num , BUF_SIZE * 2, BUF_SIZE * 2, 10, NULL, 0));                    // Install UART driver, and get the queue.        
	    ESP_ERROR_CHECK(uart_isr_free(uart_num ));                                                                  // Release the pre registered UART handler/subroutine
	    ESP_ERROR_CHECK(uart_isr_register(uart_num ,uart_intr_handle, NULL, ESP_INTR_FLAG_IRAM, NULL));             // Register new UART subroutine
	    ESP_ERROR_CHECK(uart_enable_rx_intr(uart_num ));
}

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// UART Handler
static void IRAM_ATTR uart_intr_handle(void *arg) {
  uint16_t rx_fifo_len;
  
  //status = UART0.int_st.val;            // Read UART interrupt Status
  rx_fifo_len = UART0.status.rxfifo_cnt;  // Read number of bytes in UART buffer
  
  while(rx_fifo_len){
   rxbuf[nrBytes++] = UART0.fifo.rw_byte;       // Read all bytes
   rx_fifo_len--;
  }

  UART_RECEIVED = 1;                      // Set flag

  // After reading bytes from buffer clear UART interrupt status
  uart_clear_intr_status(uart_num , UART_RXFIFO_FULL_INT_CLR|UART_RXFIFO_TOUT_INT_CLR);
}

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'uart_dev_t' {aka 'volatile struct <anonymous>'} has no member named 'fifo'
    rxbuf[nrBytes++] = UART0.fifo.rw_byte;       // Read all bytes

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static void IRAM_ATTR uart_intr_handle(void *arg) {
	unsigned int rx_fifo_len = UART0.status.rxfifo_cnt;
 	int length = uart_read_bytes(uart_num, &rxbuf, rx_fifo_len, 100);
 	uart_write_bytes(uart_num, (const char *) &rxbuf, length);
 	uart_clear_intr_status(uart_num, UART_RXFIFO_FULL_INT_CLR | UART_RXFIFO_TOUT_INT_CLR | UART_INTR_RXFIFO_FULL | 	UART_INTR_RXFIFO_TOUT);
 }

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int length = uart_read_bytes(uart_num, &rxbuf, rx_fifo_len, 100);