from machine import Pin
from machine import Timer
from time import sleep_ms
import ubluetooth

message = ""

class ESP32_BLE():
    def __init__(self, name):
    # Create internal objects for the onboard LED
    # blinking when no BLE device is connected
    # stable ON when connected
        self.led = Pin(2, Pin.OUT)
        self.timer1 = Timer(0)

self.name = name
self.ble = ubluetooth.BLE()
self.ble.active(True)
self.disconnected()
self.ble.irq(self.ble_irq)
self.register()
self.advertiser()

def connected(self):
    self.led.value(1)
    self.timer1.deinit()

def disconnected(self):
    self.timer1.init(period=100, mode=Timer.PERIODIC, callback=lambda t: self.led.value(not self.led.value()))

def ble_irq(self, event, data):
    global message

if event == 1: #_IRQ_CENTRAL_CONNECT:
# A central has connected to this peripheral
    self.connected()

elif event == 2: #_IRQ_CENTRAL_DISCONNECT:
# A central has disconnected from this peripheral.
    self.advertiser()
    self.disconnected()

elif event == 3: #_IRQ_GATTS_WRITE:
# A client has written to this characteristic or descriptor.
    buffer = self.ble.gatts_read(self.rx)
    message = buffer.decode('UTF-8').strip()
    print(message)

def register(self):
# Nordic UART Service (NUS)
    NUS_UUID = '6E400001-B5A3-F393-E0A9-E50E24DCCA9E'
    RX_UUID = '6E400002-B5A3-F393-E0A9-E50E24DCCA9E'
    TX_UUID = '6E400003-B5A3-F393-E0A9-E50E24DCCA9E'

BLE_NUS = ubluetooth.UUID(NUS_UUID)
BLE_RX = (ubluetooth.UUID(RX_UUID), ubluetooth.FLAG_WRITE)
BLE_TX = (ubluetooth.UUID(TX_UUID), ubluetooth.FLAG_NOTIFY)

BLE_UART = (BLE_NUS, (BLE_TX, BLE_RX,))
SERVICES = (BLE_UART, )
((self.tx, self.rx,), ) = self.ble.gatts_register_services(SERVICES)

def send(self, data):
    self.ble.gatts_notify(0, self.tx, data + '\n')

def advertiser(self):
    name = bytes(self.name, 'UTF-8')
    adv_data = bytearray(b'\x02\x01\x02') + bytearray((len(name) + 1, 0x09)) + name
    self.ble.gap_advertise(100, adv_data)
    print(adv_data)
    print("\r\n")
# adv_data
# raw: 0x02010209094553503332424C45
# b'\x02\x01\x02\t\tESP32BLE'
#
# 0x02 - General discoverable mode
# 0x01 - AD Type = 0x01
# 0x02 - value = 0x02

    led = Pin(2, Pin.OUT)
    but = Pin(0, Pin.IN)
    ble = ESP32_BLE("ESP32RAVI") #"ESP32RAVI"->Will be the BLE name, to discover in mobile App

def buttons_irq(pin):
    led.value(not led.value())
    ble.send('LED state is toggled.')
    print('LED state is toggled.')

but.irq(trigger=Pin.IRQ_FALLING, handler=buttons_irq)

while True:

    if message == "status":
    message = ""
    print('LED is ON.' if led.value() else 'LED is OFF')
    ble.send('LED is ON.' if led.value() else 'LED is OFF')
    sleep_ms(100)