Cannot get a response from BLE scan

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pluviofeel
Posts: 2
Joined: Fri Feb 12, 2021 8:32 am

Cannot get a response from BLE scan

Post by pluviofeel » Mon Feb 15, 2021 2:59 am

Dear Community;

It's my first post and I am new to ESP32&micropython.
I am using ESP32 to build a bluetooth network recently, but I cannot get any response from _IRQ_SCAN_RESULT.
The first method is this:

Code: Select all

from micropython import const
import ubluetooth

ble=ubluetooth.BLE()

if ble.active()== False:
    ble.active(True)
    
print(ble.active())

_IRQ_SCAN_RESULT                     = const(1 << 4)
_IRQ_SCAN_COMPLETE                   = const(1 << 5)

def adv_decode(adv_type, data):
    i = 0
    while i + 1 < len(data):
        if data[i + 1] == adv_type:
            return data[i + 2:i + data[i] + 1]
        i += 1 + data[i]
    return None

def adv_decode_name(data):
    n = adv_decode(0x09, data)
    if n:
        return n.decode('utf-8')
    return data

def bt_irq(event, data):
    if event == _IRQ_SCAN_RESULT:
        # A single scan result.
        addr_type, addr, connectable, rssi, adv_data = data
        print(addr_type, addr, adv_decode_name(adv_data))
    elif event == _IRQ_SCAN_COMPLETE:
        # Scan duration finished or manually stopped.
        print('scan complete')

ble.irq(handler=bt_irq)

# Scan for 10s (at 100% duty cycle)
ble.gap_scan(10000, 30000, 30000)
And I just got a "True"

The second option is the following:

Code: Select all

import ubluetooth
import utime
from micropython import const
_IRQ_CENTRAL_CONNECT                 = const(1 << 0)
_IRQ_CENTRAL_DISCONNECT              = const(1 << 1)
_IRQ_GATTS_WRITE                     = const(1 << 2)
_IRQ_GATTS_READ_REQUEST              = const(1 << 3)
_IRQ_SCAN_RESULT                     = const(1 << 4)
_IRQ_SCAN_COMPLETE                   = const(1 << 5)
_IRQ_PERIPHERAL_CONNECT              = const(1 << 6)
_IRQ_PERIPHERAL_DISCONNECT           = const(1 << 7)
_IRQ_GATTC_SERVICE_RESULT            = const(1 << 8)
_IRQ_GATTC_CHARACTERISTIC_RESULT     = const(1 << 9)
_IRQ_GATTC_DESCRIPTOR_RESULT         = const(1 << 10)
_IRQ_GATTC_READ_RESULT               = const(1 << 11)
_IRQ_GATTC_WRITE_STATUS              = const(1 << 12)
_IRQ_GATTC_NOTIFY                    = const(1 << 13)
_IRQ_GATTC_INDICATE                  = const(1 << 14)

ble=ubluetooth.BLE()

if ble.active()== False:
    ble.active(True)
    
print(ble.active())

def form_mac_address(addr: bytes) -> str:
    return ":".join('{:02x}'.format(b) for b in addr)


print("BLE current mac address: {}".format(form_mac_address(ble.config("mac"))))


def bt_irq(event, data):
    if event == _IRQ_CENTRAL_CONNECT:
        # A central has connected to this peripheral.
        conn_handle, addr_type, addr = data
    elif event == _IRQ_CENTRAL_DISCONNECT:
        # A central has disconnected from this peripheral.
        conn_handle, addr_type, addr = data
    elif event == _IRQ_GATTS_WRITE:
        # A central has written to this characteristic or descriptor.
        conn_handle, attr_handle = data
    elif event == _IRQ_GATTS_READ_REQUEST:
        # A central has issued a read. Note: this is a hard IRQ.
        # Return None to deny the read.
        # Note: This event is not supported on ESP32.
        conn_handle, attr_handle = data
    elif event == _IRQ_SCAN_RESULT:
        # A single scan result.
        addr_type, addr, connectable, rssi, adv_data = data
        print('type:{} addr:{} rssi:{} data:{}'.format(addr_type, ubinascii.hexlify(addr), rssi, ubinascii.hexlify(adv_data)))
    elif event == _IRQ_SCAN_COMPLETE:
        # Scan duration finished or manually stopped.
        pass
    elif event == _IRQ_PERIPHERAL_CONNECT:
        # A successful gap_connect().
        conn_handle, addr_type, addr = data
    elif event == _IRQ_PERIPHERAL_DISCONNECT:
        # Connected peripheral has disconnected.
        conn_handle, addr_type, addr = data
    elif event == _IRQ_GATTC_SERVICE_RESULT:
        # Called for each service found by gattc_discover_services().
        conn_handle, start_handle, end_handle, uuid = data
    elif event == _IRQ_GATTC_CHARACTERISTIC_RESULT:
        # Called for each characteristic found by gattc_discover_services().
        conn_handle, def_handle, value_handle, properties, uuid = data
    elif event == _IRQ_GATTC_DESCRIPTOR_RESULT:
        # Called for each descriptor found by gattc_discover_descriptors().
        conn_handle, dsc_handle, uuid = data
    elif event == _IRQ_GATTC_READ_RESULT:
        # A gattc_read() has completed.
        conn_handle, value_handle, char_data = data
    elif event == _IRQ_GATTC_WRITE_STATUS:
        # A gattc_write() has completed.
        conn_handle, value_handle, status = data
    elif event == _IRQ_GATTC_NOTIFY:
        # A peripheral has sent a notify request.
        conn_handle, value_handle, notify_data = data
    elif event == _IRQ_GATTC_INDICATE:
        # A peripheral has sent an indicate request.
        conn_handle, value_handle, notify_data = data
        
ble.irq(bt_irq)

ble.gap_scan(20000)
With this method I am not getting any error but only the mac address...

Please any help or suggestion is highly appreciated.

Thanks a lot,

Pluvio.

User avatar
jimmo
Posts: 2244
Joined: Tue Aug 08, 2017 1:57 am
Location: Sydney, Australia
Contact:

Re: Cannot get a response from BLE scan

Post by jimmo » Mon Feb 15, 2021 3:29 am

pluviofeel wrote:
Mon Feb 15, 2021 2:59 am
Please any help or suggestion is highly appreciated.
It looks like you might be using sample code from an older version of the bluetooth API (it was marked as experimental for this reason, although it's starting to stabilise now). Assuming you're using MicroPython 1.13 or 1.14, then please see https://docs.micropython.org/en/latest/ ... tooth.html

In particular, the constants for the event types has changed.

Code: Select all

from micropython import const
_IRQ_CENTRAL_CONNECT = const(1)
_IRQ_CENTRAL_DISCONNECT = const(2)
_IRQ_GATTS_WRITE = const(3)
_IRQ_GATTS_READ_REQUEST = const(4)
_IRQ_SCAN_RESULT = const(5)
_IRQ_SCAN_DONE = const(6)
_IRQ_PERIPHERAL_CONNECT = const(7)
_IRQ_PERIPHERAL_DISCONNECT = const(8)
_IRQ_GATTC_SERVICE_RESULT = const(9)
_IRQ_GATTC_SERVICE_DONE = const(10)
_IRQ_GATTC_CHARACTERISTIC_RESULT = const(11)
_IRQ_GATTC_CHARACTERISTIC_DONE = const(12)
_IRQ_GATTC_DESCRIPTOR_RESULT = const(13)
_IRQ_GATTC_DESCRIPTOR_DONE = const(14)
_IRQ_GATTC_READ_RESULT = const(15)
_IRQ_GATTC_READ_DONE = const(16)
_IRQ_GATTC_WRITE_DONE = const(17)
_IRQ_GATTC_NOTIFY = const(18)
_IRQ_GATTC_INDICATE = const(19)
_IRQ_GATTS_INDICATE_DONE = const(20)
_IRQ_MTU_EXCHANGED = const(21)
_IRQ_L2CAP_ACCEPT = const(22)
_IRQ_L2CAP_CONNECT = const(23)
_IRQ_L2CAP_DISCONNECT = const(24)
_IRQ_L2CAP_RECV = const(25)
_IRQ_L2CAP_SEND_READY = const(26)
_IRQ_CONNECTION_UPDATE = const(27)
_IRQ_ENCRYPTION_UPDATE = const(28)
_IRQ_GET_SECRET = const(29)
_IRQ_SET_SECRET = const(30)

pluviofeel
Posts: 2
Joined: Fri Feb 12, 2021 8:32 am

Re: Cannot get a response from BLE scan

Post by pluviofeel » Mon Feb 15, 2021 4:08 am

jimmo wrote:
Mon Feb 15, 2021 3:29 am
pluviofeel wrote:
Mon Feb 15, 2021 2:59 am
Please any help or suggestion is highly appreciated.
It looks like you might be using sample code from an older version of the bluetooth API (it was marked as experimental for this reason, although it's starting to stabilise now). Assuming you're using MicroPython 1.13 or 1.14, then please see https://docs.micropython.org/en/latest/ ... tooth.html

In particular, the constants for the event types has changed.

Code: Select all

from micropython import const
_IRQ_CENTRAL_CONNECT = const(1)
_IRQ_CENTRAL_DISCONNECT = const(2)
_IRQ_GATTS_WRITE = const(3)
_IRQ_GATTS_READ_REQUEST = const(4)
_IRQ_SCAN_RESULT = const(5)
_IRQ_SCAN_DONE = const(6)
_IRQ_PERIPHERAL_CONNECT = const(7)
_IRQ_PERIPHERAL_DISCONNECT = const(8)
_IRQ_GATTC_SERVICE_RESULT = const(9)
_IRQ_GATTC_SERVICE_DONE = const(10)
_IRQ_GATTC_CHARACTERISTIC_RESULT = const(11)
_IRQ_GATTC_CHARACTERISTIC_DONE = const(12)
_IRQ_GATTC_DESCRIPTOR_RESULT = const(13)
_IRQ_GATTC_DESCRIPTOR_DONE = const(14)
_IRQ_GATTC_READ_RESULT = const(15)
_IRQ_GATTC_READ_DONE = const(16)
_IRQ_GATTC_WRITE_DONE = const(17)
_IRQ_GATTC_NOTIFY = const(18)
_IRQ_GATTC_INDICATE = const(19)
_IRQ_GATTS_INDICATE_DONE = const(20)
_IRQ_MTU_EXCHANGED = const(21)
_IRQ_L2CAP_ACCEPT = const(22)
_IRQ_L2CAP_CONNECT = const(23)
_IRQ_L2CAP_DISCONNECT = const(24)
_IRQ_L2CAP_RECV = const(25)
_IRQ_L2CAP_SEND_READY = const(26)
_IRQ_CONNECTION_UPDATE = const(27)
_IRQ_ENCRYPTION_UPDATE = const(28)
_IRQ_GET_SECRET = const(29)
_IRQ_SET_SECRET = const(30)
Thanks a lot!!!
It works right now(even though I don't understand what the concept is..

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