how to turn on relay by SIM7600E 4G module voice call in ESPHome

Code:
esphome:

  name: a2



esp32:

  board: esp32dev

  framework:

    type: arduino



# Enable logging

logger:



# Enable Home Assistant API

api:

  encryption:

    key: "YnmQggQsfd7jvFefoMqNCpBtb63RXtotS+mSBQVIhY8="



# Example configuration entry

ethernet:

  type: LAN8720

  mdc_pin: GPIO23

  mdio_pin: GPIO18

  clk_mode: GPIO17_OUT

  phy_addr: 0



switch:

  - platform: gpio

    name: "a2-light1"

    pin: 15

    inverted: False

    id: relay_1  # Assign ID to relay 1



  - platform: gpio

    name: "a2-light2"

    pin: 2

    inverted: False



binary_sensor:

  - platform: gpio

    name: "a2-input1"

    pin: 

      number: 36

      inverted: true



  - platform: gpio

    name: "a2-input2"

    pin:

      number: 39

      inverted: true



web_server:

  port: 80



# UART configuration for SIM7600E

uart:

  id: uart_2

  tx_pin: GPIO5

  rx_pin: GPIO13

  baud_rate: 115200



interval:

  - interval: 200ms  # Shorten the interval to reduce blocking time

    then:

      - lambda: |-

          static std::string uart_buffer;

          uint8_t c;

          int count = 0;

          const int max_reads = 10;  // Limit the number of bytes read per interval



          while (id(uart_2).available() && count < max_reads) {

            if (id(uart_2).read_byte(&c)) {

              uart_buffer += (char)c;

              count++;



              // Log each received character (optional for debugging)

              ESP_LOGD("UART", "Received: %c", (char)c);



              // Check if we have received the "RING" signal

              if (uart_buffer.find("RING") != std::string::npos) {

                ESP_LOGI("SIM7600", "Incoming call detected, turning on relay 1.");

                id(relay_1).turn_on();  // Turn on relay 1

                uart_buffer.clear();  // Clear the buffer after processing

              }



              // Clear the buffer if it gets too large

              if (uart_buffer.length() > 100) {

                uart_buffer.clear();

              }

            }

          }