How Can I Directly Connect ESP32 BLE with Mobile Bluetooth using Micropython?

Question

I'm trying to Connect directly esp32 BLE with mobile without the help of the Bluetooth serial Terminal app. I used Thonny IDE for coding. When I tried to connect directly with mobile here is the pop-up I got.

https://i.sstatic.net/fISYr.jpg

here is the code i used

from machine import Pin, Timer, SoftI2C
from time import sleep_ms
import ubluetooth
from esp32 import raw_temperature
from hdc1080 import HDC1080

class BLE():
    def __init__(self, name):   
        self.name = name
        self.ble = ubluetooth.BLE()
        self.ble.active(True)

        self.led = Pin(2, Pin.OUT)
        self.timer1 = Timer(0)
        self.timer2 = Timer(1)
        
        self.disconnected()
        self.ble.irq(self.ble_irq)
        self.register()
        self.advertiser()

    def connected(self):        
        self.timer1.deinit()
        self.timer2.deinit()

    def disconnected(self):        
        self.timer1.init(period=1000, mode=Timer.PERIODIC, callback=lambda t: self.led(1))
        sleep_ms(200)
        self.timer2.init(period=1000, mode=Timer.PERIODIC, callback=lambda t: self.led(0))   

    def ble_irq(self, event, data):
        if event == 1:
            '''Central disconnected'''
            self.connected()
            self.led(1)
        
        elif event == 2:
            '''Central disconnected'''
            self.advertiser()
            self.disconnected()
        
        elif event == 3:
            '''New message received'''            
            buffer = self.ble.gatts_read(self.rx)
            message = buffer.decode('UTF-8').strip()
            print(message)            
            if message == 'red_led':
                red_led.value(not red_led.value())
                print('red_led', red_led.value())
                ble.send('red_led' + str(red_led.value()))
            if message == 'read_temp':
                print(sensor.read_temperature(True))
                ble.send(str(sensor.read_temperature(True)))
            if message == 'read_hum':
                print(sensor.read_humidity())
                ble.send(str(sensor.read_humidity()))
           
    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')
        self.ble.gap_advertise(100, bytearray('\x02\x01\x02') + bytearray((len(name) + 1, 0x09)) + name)
        
# test
i2c = SoftI2C(scl=Pin(22), sda=Pin(21))
sensor = HDC1080(i2c)
red_led = Pin(2, Pin.OUT)
ble = BLE("ESP32")

I can connect using the Bluetooth Serial Terminal app But My question is How can I connect directly without using Bluetooth serial terminal app

As your ESP32 device is BLE serial device, then you have no other option but to have application, that knows how to handle Serial communication. — Lixas
– Lixas, Commented Sep 12, 2022 at 14:42

用戶名不能是空白 · Accepted Answer · 2022-12-24 03:58:53Z

1

I believe I saw this piece of code somewhere on the internet as well. Unfortunately this is an outdated code and it won't work with the current version of ubluetooth. This is a quick list of ubluetooth.BLE from MicroPython firmware "esp32-20220618-v1.19.1.bin"

>>> import ubluetooth

>>> dir(ubluetooth.BLE)

['__class__', '__name__', '__bases__', '__dict__', 'active', 'config', 'gap_advertise', 'gap_connect', 'gap_disconnect', 'gap_scan', 'gattc_discover_characteristics', 'gattc_discover_descriptors', 'gattc_discover_services', 'gattc_exchange_mtu', 'gattc_read', 'gattc_write', 'gatts_indicate', 'gatts_notify', 'gatts_read', 'gatts_register_services', 'gatts_set_buffer', 'gatts_write', 'irq']

answered Dec 24, 2022 at 3:58

用戶名不能是空白

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Adrian David Smith Over a year ago

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