/**
* The sketch cotains two main parts:
* - Serial console for controlling LED
* - BLE GATT service
*/
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
#define SERVICE_UUID        "0fc04e02-c8f4-4d51-aad6-35c5db47c27e"
#define CHARACTERISTIC_UUID "ece27bad-3d4b-4072-8494-76a551f0b6cc"
const uint8_t blue_led = 2; //LED pin on ESP32 DEVKIT V1 DOIT board
uint8_t led_status = '0';
uint8_t char_value = '0';
BLEServer* pServer = NULL;
BLEService *pService = NULL;
BLECharacteristic* pCharacteristic = NULL;
bool deviceConnected = false;
bool oldDeviceConnected = false;
class MyServerCallbacks: public BLEServerCallbacks {
    void onConnect(BLEServer* pServer) {
      deviceConnected = true;
    };
    void onDisconnect(BLEServer* pServer) {
      deviceConnected = false;
    }
};
void console_routine(void) {
  if (Serial.available() > 0) {
    char inByte = Serial.read();
    if (inByte == '0') {
      digitalWrite(blue_led, LOW); //turn LED off
      led_status = '0';
    }
    if (inByte == '1') {
      digitalWrite(blue_led, HIGH); //turn LED on
      led_status = '1';
    }
  }
}
void ble_connection_routine(void) {
    // notify changed value
    if (deviceConnected) {
        if (char_value != led_status) {
          char_value = led_status;
          pCharacteristic->setValue((uint8_t*)&char_value, 1);
        }
        delay(3);
    }
    // disconnecting
    if (!deviceConnected && oldDeviceConnected) {
        delay(500); // give the bluetooth stack the chance to get things ready
        pServer->startAdvertising(); // restart advertising
        oldDeviceConnected = deviceConnected;
    }
    // connecting
    if (deviceConnected && !oldDeviceConnected) {
        oldDeviceConnected = deviceConnected;
    }
}
void setup() {
  pinMode(blue_led, OUTPUT);
  Serial.begin(115200);
  while (!Serial) {
  }
  BLEDevice::init("ESP32_LED_STATUS");
  pServer = BLEDevice::createServer();
  pServer->setCallbacks(new MyServerCallbacks());
  pService = pServer->createService(SERVICE_UUID);
  pCharacteristic = pService->createCharacteristic(
                                         CHARACTERISTIC_UUID,
                                         BLECharacteristic::PROPERTY_READ);
  pCharacteristic->setValue((uint8_t*)&char_value, 1);
  pService->start();
  BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
  pAdvertising->addServiceUUID(SERVICE_UUID);
  pAdvertising->setScanResponse(false);
  pAdvertising->setMinPreferred(0x0);
  BLEDevice::startAdvertising();
}
void loop() {
  console_routine();
  ble_connection_routine();
}

pip3 install robotframework robotframework-seriallibrary pygatt

sudo apt install wiringpi

*** Settings ***
Suite Setup    Log    Suite setup           # Запускается перед тест-сьютом
Suite Teardown    Log    Suite teardown     # Запускается после тест-сьюта
Test Setup    Log    Test setup             # Запускается перед тест-кейсом
Test Teardown    Log    Test teardown       # Запускается после тест-кейса
*** Test Cases ***
Test Case Pass Example    # Пример успешного тест-кейса
    ${hello_world}=    Set Variable    Hello    # Встроенное ключевое слово Set Variable для создания переменной
    ${hello_world}=    Add Word To String  ${hello_world}  world    # Кастомное ключевое слово для добавления слова к строке
    Should Be Equal As Strings  ${hello_world}    Hello world    # Сравнение строк, в данном случае возвращает Pass
Test Case Fail Example    # Пример зафейленного тест-кейса
    ${hello_world}=    Set Variable    Goodbye
    ${hello_world}=    Add Word To String  ${hello_world}  world
    Should Be Equal As Strings  ${hello_world}    Hello world    # Сравнение строк, в данном случае возвращает Fail
*** Keywords ***
Add Word To String    # Новое ключевое слово
    [Arguments]    ${string}    ${word}    # Принимает на входе два аргумента
    ${string}=  Catenate    ${string}   ${word}    # Встроенное ключевое слово для соединения строк
    [Return]    ${string}    # Возвращает строку с добавленным словом

robot simple_test.robot

*** Settings ***
Library    Process    #built-in library
Library    SerialLibrary    #external 3rd-party library
Test Setup    Run Keywords
...           Open Serial Port
Test Teardown    Delete All Ports
*** Variables ***
${esp32_dev_path}    /dev/ttyUSB0    #dev path for serial communication
*** Test Cases ***
Test LED Switch Off
    Turn LED Off
    ${led_state_gpio}=    Get LED State
    Should Be Equal As Integers    ${led_state_gpio}    0
Test LED Switch On
    Turn LED On
    ${led_state_gpio}=    Get LED State
    Should Be Equal As Integers    ${led_state_gpio}    1
*** Keywords ***
Turn LED On
    Write Data    0x31    #0x31 is ascii '1'
Turn LED Off
    Write Data    0x30    #0x31 is ascii '0'
Get LED State
    ${result}=    Run Process    gpio    read    0
    Log    all output: ${result.stdout}
    [Return]    ${result.stdout}
Open Serial Port
    Add Port   ${esp32_dev_path}
    ...        baudrate=115200
    ...        bytesize=8
    ...        parity=N
    ...        stopbits=1
    ...        timeout=999

import pygatt.backends
class BluetoothTesting:
    def read_char_value(self, mac, char_uuid):
        adapter = pygatt.backends.GATTToolBackend()
        try:
            adapter.start()    #open adapter
            device = adapter.connect(mac)    #connect to device via gatt
            value = device.char_read(char_uuid)    #read characteristic with the given uuid
            return value    #return characteristic
        finally:
            adapter.stop()

*** Settings ***
Library    Process    #built-in library
Library    SerialLibrary    #external 3rd-party library
Library    BluetoothTesting.py    #custom library
Test Setup    Run Keywords
...           Open Serial Port
Test Teardown    Delete All Ports
*** Variables ***
${char_uuid}    ece27bad-3d4b-4072-8494-76a551f0b6cc        #BLE characteristic UUID
${ble_mac}    f0:08:d1:d5:0c:ae      #BLE device access address
${esp32_dev_path}    /dev/ttyUSB0    #dev path for serial communication
*** Test Cases ***
Test LED Switch Off
    Turn LED Off
    ${led_state_gpio}=    Get LED State
    Should Be Equal As Integers    ${led_state_gpio}    0
    ${led_state_ble}=    Read Char Value    ${ble_mac}    ${char_uuid}
    Should Be Equal As Integers    ${led_state_ble}    0
Test LED Switch On
    Turn LED On
    ${led_state_gpio}=    Get LED State
    Should Be Equal As Integers    ${led_state_gpio}    1
    ${led_state_ble}=    Read Char Value    ${ble_mac}    ${char_uuid}
    Should Be Equal As Integers    ${led_state_ble}    1
*** Keywords ***
Turn LED On
    Write Data    0x31    #0x31 is ascii '1'
Turn LED Off
    Write Data    0x30    #0x31 is ascii '0'
Get LED State
    ${result}=    Run Process    gpio    read    0
    Log    all output: ${result.stdout}
    [Return]    ${result.stdout}
Open Serial Port
    Add Port   ${esp32_dev_path}
    ...        baudrate=115200
    ...        bytesize=8
    ...        parity=N
    ...        stopbits=1
    ...        timeout=999