Bluetooth Low Energy (BLE) doesn't work with ESP32-WROVER

[Allan196]

I copied some Micropython code from https://forum.micropython.org/viewtopic.php?t=8645 to test BLE.
Code is attached as a txt file because .py files can't be attached!!.
main.txt

I firstly ran the code on a ESP32-WROOM (firmware esp32-20220618-v1.19.1.bin) and I was able to use a mobile phone to connect to the ESP32-WROOM.

I tried the same code on a ESP32-WROVER (firmware esp32spiram-20220618-v1.19.1.bin) and couldn't connect (the code ran with no exceptions or errors). I then changed the firmware on the ESP32-WROVER to esp32-20220618-v1.19.1.bin and that wouldn't connect either when I ran it.

I have used the ESP32-WROVER (firmware esp32spiram-20220618-v1.19.1.bin) successfully with WiFi.

The Espressif ESP32-WROVER datasheet states BLE support.

Any ideas?

Thanks
Allan

[peterhinch]

Here is @Allan196's code:

from machine import Pin, Timer
from time import sleep_ms
import ubluetooth
from esp32 import raw_temperature

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')[:-1]
            print(message)
            
            if message == 'blue_led':
                blue_led.value(not blue_led.value())

            
    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
blue_led = Pin(2, Pin.OUT)
ble = BLE("ESP32")
while True:
  pass

[Allan196]

Following up on my initial post, I thought that the problem was why does the BLE device connect to the ESP32-WROOM and not the ESP32-ROVER.
Since then I have tried another ESP32-WROOM module and it also doesn't connect!
Using esptool.py I obtained the following information which is the same for both ESP32-WROOM modules:
Detecting chip type... ESP32
Chip is ESP32-D0WDQ6 (revision v1.0)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None

So with two seemingly the same ESP32-WROOM modules, why does one connect and the other doesn't? They are running the same MicroPython code and the same firmware (esp32-20220618-v1.19.1.bin).