#https://www.youtube.com/watch?v=2mePPqiocUE
#https://play.google.com/store/apps/details?id=de.kai_morich.serial_bluetooth_terminal
from machine import Pin
from machine import Timer
from time import sleep_ms
import ubluetooth

ble_msg = ""
tipka = Pin(0, Pin.IN, Pin.PULL_DOWN)#ESP32-0 ESP32c3-9
class ESP32_BLE():
    def __init__(self, name):
        self.modra = Pin(2, Pin.OUT) #ESP32-2 ESP32c3-5
        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.modra.value(1)
        self.timer1.deinit()
    def disconnected(self):        
        self.timer1.init(period=100, mode=Timer.PERIODIC, callback=lambda t: self.modra.value(not self.modra.value()))
    def ble_irq(self, event, data):
        global ble_msg
        if event == 1:
            self.connected()
        elif event == 2:
            self.advertiser()
            self.disconnected()
        elif event == 3:         
            buffer = self.ble.gatts_read(self.rx)
            ble_msg = buffer.decode('UTF-8').strip()
    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('\x02\x01\x02') + bytearray((len(name) + 1, 0x09)) + name
        self.ble.gap_advertise(100, adv_data)
        print(adv_data)
        print("\r\n")
ble = ESP32_BLE("ESP32BLE")
def tipke_irq(pin):
    ble.modra.value(not ble.modra.value())
    ble.send('LED stanje bo spremenjeno.')
    print('LED stanje je spremenjeno.')
tipka.irq(trigger=Pin.IRQ_FALLING, handler=tipke_irq)

while True:
    if ble_msg == 'beri_LED':
        print(ble_msg)
        ble_msg = ""
        print('LED gori.' if ble.modra.value() else 'LED je ugasnjena')
        ble.send('LED gori.' if ble.modra.value() else 'LED je ugasnjena')
    sleep_ms(100)