#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/uart.h"

//#define UART_TX_PIN (GPIO_NUM_1)
//#define UART_RX_PIN (GPIO_NUM_3)
#define ECHO_TEST_TXD  (3)
#define ECHO_TEST_RXD  (1)
#define BUF_SIZE (1024)

void uart_task(void *pvParameters) {
    uint8_t *data = (uint8_t *) malloc(BUF_SIZE);
    while (1) {
        int len = uart_read_bytes(UART_NUM_1, data, BUF_SIZE, 20 / portTICK_RATE_MS);
        if (len > 0) {
            data[len] = 0; // Null-terminate the received data
            printf("Received command: %s\n", data);
            // Here you can process the received command and control the relay
        }
    }
    free(data);
}

void app_main() {
    uart_config_t uart_config = {
        .baud_rate = 9600,
        .data_bits = UART_DATA_8_BITS,
        .parity = UART_PARITY_DISABLE,
        .stop_bits = UART_STOP_BITS_1,
        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE
    };
    uart_param_config(UART_NUM_1, &uart_config);
    uart_set_pin(UART_NUM_1, ECHO_TEST_TXD, ECHO_TEST_RXD, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
    uart_driver_install(UART_NUM_1, BUF_SIZE * 2, 0, 0, NULL, 0);

    xTaskCreate(uart_task, "uart_task", 2048, NULL, configMAX_PRIORITIES, NULL);
}