Cannot connect BLE in LoPy

[Fikret Avci]

Hi all,

I have a LoPy device and I want to connect a device via Bluetooth. It can read the advertises, but it cannot connect the device. Is there any Bluetooth setting I need to set in LoPy device or the corresponding device, or is there any way to debug it? The adv_type I am receiving is 0. Here is the code I am trying:

from network import Bluetooth
import time
bt = Bluetooth()
bt.start_scan(-1)

while True:
    adv = bt.get_adv()

    if adv and bt.resolve_adv_data(adv.data, Bluetooth.ADV_NAME_CMPL) == 'BBC micro:bit [zaput]':
        print(adv.adv_type)

        try:
            conn = bt.connect(adv.mac)
            print('connected')
            services = conn.services()
            for service in services:
                time.sleep(0.050)
                if type(service.uuid()) == bytes:
                    print('Reading chars from service = {}'.format(service.uuid()))
                else:
                    print('Reading chars from service = %x' % service.uuid())
                chars = service.characteristics()
                for char in chars:
                    if (char.properties() & Bluetooth.PROP_READ):
                        print('char {} value = {}'.format(char.uuid(), char.read()))
            conn.disconnect()
            break
        except:
            print("Error while connecting or reading from the BLE device")
            break
    else:
        time.sleep(0.050)

Also, I am getting these lines as the output and firmware version:

0
Error while connecting or reading from the BLE device
Pycom MicroPython 1.20.2.r6 [v1.11-c5a0a97] on 2021-10-28; LoPy with ESP32
Pybytes Version: 1.7.1

[jcaron]

@Fikret-Avci Are you able to connect to the device using a different device, like a smartphone with nRF Connect for instance (or one of the many other BLE scanners)?

[Fikret Avci]

@jcaron I can connect other device with app on the smart phone. Also, I could connect LoPy when I use it as server.

[Fikret Avci]

This post is deleted!

[Fikret Avci]

It says OSError: connection refused after trying to connect with connect(adv.mac)