Changing Lego Remote Handset name ... #1607

vascolp · 2024-06-30T10:34:16Z

vascolp
Jun 30, 2024

bleak version: 0.22.2
Python version: 3.12.3
Operating System: Windows 11

Description

I am trying to change a Lego Remote Handset name (currently named AAA).
By looking at LW3P docs, it is very easy to do.
I tried with nRF Connect and, at the first attempt, I was able to read a write the Remote name.
As much as I try it with windows/bleak, I cannot do it ...
Can you help me? What am I doing wrong?
Thank you very much!!

Notice in the output below that I get proper notifications after connection but I do not get any notifications after sending the command to read the name. In nRF Connect the command to read the name resulted in an immediate reply with current Remote name...

Program:

import asyncio
import logging
from bleak import BleakScanner, BleakClient, backends
from pybricksdev.ble import pybricks
from pybricksdev.ble.lwp3 import LWP3_HUB_SERVICE_UUID, LWP3_HUB_CHARACTERISTIC_UUID

logger = logging.getLogger(__name__)
logging.basicConfig(level = logging.DEBUG)

async def main():
    hub_name='AAA'
     
    def handle_disconnect(_):
        print('Disconnected!')
        
    async def handle_reply(_, data: bytearray):
        print('handle_reply:', len(data), data)
     
    dev = await BleakScanner.find_device_by_name(hub_name)
    if not dev:
        raise ValueError('Device "{}" not found!'.format(hub_name))
     
    print('Connect')
    client= BleakClient(dev, handle_disconnect)
    await client.connect()
     
    svc = client.services.get_service(LWP3_HUB_SERVICE_UUID)
    characteristic = svc.get_characteristic(LWP3_HUB_CHARACTERISTIC_UUID)
     
    print('Start notify')
    await client.start_notify(characteristic, handle_reply)
     
    print('Read name')
    await client.write_gatt_char(characteristic, b'\0x05\0x00\0x01\0x01\0x02', response=True)
     
    print ('Sleep')
    await asyncio.sleep(2)

    print('Change name to abc')
    await client.write_gatt_char(characteristic, b'\0x08\0x00\0x01\0x01\0x01abc', response=True)
     
    print ('Sleep')
    await asyncio.sleep(2)
     
    print('bye')
    await client.stop_notify(characteristic)
    await client.disconnect()

asyncio.run(main())

Output with no DEBUG:

Connect
Start notify
Read name
handle_reply: 15 bytearray(b'\x0f\x00\x04\x00\x017\x00\x00\x00\x00\x10\x00\x00\x00\x10')
handle_reply: 15 bytearray(b'\x0f\x00\x04\x01\x017\x00\x00\x00\x00\x10\x00\x00\x00\x10')
handle_reply: 15 bytearray(b'\x0f\x00\x044\x01\x17\x00\x00\x00\x00\x10\x00\x00\x00\x10')
handle_reply: 15 bytearray(b'\x0f\x00\x04;\x01\x14\x00\x02\x00\x00\x00\x02\x00\x00\x00')
handle_reply: 15 bytearray(b'\x0f\x00\x04<\x018\x00\x00\x00\x00\x10\x00\x00\x00\x10')
Sleep
Change name to abc
Sleep
bye

Output with DEBUG:

DEBUG:asyncio:Using proactor: IocpProactor
DEBUG:bleak.backends.winrt.scanner:Received C4:64:E3:09:67:21: .
DEBUG:bleak.backends.winrt.scanner:Received C4:64:E3:09:67:21: AAA.
DEBUG:bleak.backends.winrt.scanner:Received 59:67:87:B6:5E:0C: .
DEBUG:bleak.backends.winrt.scanner:2 devices found. Watcher status: <BluetoothLEAdvertisementWatcherStatus.STOPPED: 3>.
Connect
DEBUG:bleak.backends.winrt.client:Connecting to BLE device @ C4:64:E3:09:67:21
DEBUG:bleak.backends.winrt.client:getting services (service_cache_mode=None, cache_mode=None)...
DEBUG:bleak.backends.winrt.client:session_status_changed_event_handler: id: BluetoothLE#BluetoothLEe8:48:b8:c8:40:00-c4:64:e3:09:67:21, error: <BluetoothError.SUCCESS: 0>, status: <GattSessionStatus.ACTIVE: 1>
DEBUG:bleak.backends.winrt.client:C4:64:E3:09:67:21: services changed
DEBUG:bleak.backends.winrt.client:C4:64:E3:09:67:21: services changed
Start notify
handle_reply: 15 bytearray(b'\x0f\x00\x04\x00\x017\x00\x00\x00\x00\x10\x00\x00\x00\x10')
handle_reply: 15 bytearray(b'\x0f\x00\x04\x01\x017\x00\x00\x00\x00\x10\x00\x00\x00\x10')
Read name
handle_reply: 15 bytearray(b'\x0f\x00\x044\x01\x17\x00\x00\x00\x00\x10\x00\x00\x00\x10')
handle_reply: 15 bytearray(b'\x0f\x00\x04;\x01\x14\x00\x02\x00\x00\x00\x02\x00\x00\x00')
handle_reply: 15 bytearray(b'\x0f\x00\x04<\x018\x00\x00\x00\x00\x10\x00\x00\x00\x10')
Sleep
Change name to abc
Sleep
bye
DEBUG:bleak.backends.winrt.client:Disconnecting from BLE device...
DEBUG:bleak.backends.winrt.client:session_status_changed_event_handler: id: BluetoothLE#BluetoothLEe8:48:b8:c8:40:00-c4:64:e3:09:67:21, error: <BluetoothError.SUCCESS: 0>, status: <GattSessionStatus.CLOSED: 0>
Disconnected!
DEBUG:bleak.backends.winrt.client:closing requester
DEBUG:bleak.backends.winrt.client:closing session

dlech · 2024-06-30T15:16:28Z

dlech
Jun 30, 2024
Collaborator

FYI, at Pybricks, we have a command line tool for the LWP3 protocol. So you can change the hub name like this:

$ pipx run pybricksdev lwp3 repl
[10:03:15.207] INFO: scanning...
[10:03:19.020] INFO: found device
[10:03:19.892] INFO: connected
Type message and press ENTER to send. Press CTRL+D to exit.
>>> HubPropertyRequestUpdate(HubProperty.NAME)
[10:04:51.276] INFO: sending: HubPropertyRequestUpdate(<HubProperty.NAME: 1>)
[10:04:51.328] INFO: received: HubPropertyUpdate(<HubProperty.NAME: 1>, 'truck2')
>>> HubPropertySet(HubProperty.NAME, "truck")
[10:05:27.854] INFO: sending: HubPropertySet(<HubProperty.NAME: 1>, 'truck')
>>> HubPropertyRequestUpdate(HubProperty.NAME)
[10:05:36.262] INFO: sending: HubPropertyRequestUpdate(<HubProperty.NAME: 1>)
[10:05:36.329] INFO: received: HubPropertyUpdate(<HubProperty.NAME: 1>, 'truck')
>>>

As for your script, I would try putting a sleep right after start_notify() to give it time to receive the hub port config before sending any commands.

And I would check your byte strings. For example the first byte of b'\0x05\0x00\0x01\0x02' is 5, which is supposed to be the length, but there are only 4 bytes.

1 reply

vascolp Jun 30, 2024
Author

You are correct its a bug in my code... it´s the result of the many tries I have done... including some with lots of sleeps.
Does not work anyway. I wish it were so simple :-)
Thank you for your reply.

vascolp · 2024-06-30T18:32:03Z

vascolp
Jun 30, 2024
Author

pybricksdev lwp3 repl crashes with

bleak.exc.BleakError: Thread is configured for Windows GUI but callbacks are not working. Suspect unwanted side effects from importing 'pythoncom'.

pybricksdev --version
pybricksdev v1.0.0a48

I just tried all the hypothesis in here in my program.... but it does not seem to fix.
I am inside a venv with kivy and pybricksdev and bleak.... but I have done a lot of connections to pybricks hubs and had no problems... with LWP3 seems to be the triky part.

5 replies

dlech Jun 30, 2024
Collaborator

bleak.exc.BleakError: Thread is configured for Windows GUI but callbacks are not working. Suspect unwanted side effects from importing 'pythoncom'.

I'm not getting this when running with pipx I'm guessing you installed it in an environment with additional packages?

vascolp Jun 30, 2024
Author

Yes...

 pip list
Package                                                 Version
------------------------------------------------------- --------
aioserial                                               1.3.1
appdirs                                                 1.4.4
argcomplete                                             1.12.3
asyncssh                                                2.14.2
bleak                                                   0.22.2
certifi                                                 2024.2.2
cffi                                                    1.16.0
charset-normalizer                                      3.3.2
colorama                                                0.4.6
cryptography                                            42.0.6
docutils                                                0.21.2
hidapi                                                  0.14.0
idna                                                    3.7
Kivy                                                    2.3.0
kivy-deps.angle                                         0.4.0
kivy-deps.glew                                          0.3.1
kivy-deps.gstreamer                                     0.3.3
kivy-deps.sdl2                                          0.7.0
Kivy-examples                                           2.3.0
Kivy-Garden                                             0.1.5
mpy-cross-v5                                            1.0.2
mpy-cross-v6                                            1.0.2
packaging                                               22.0
pillow                                                  10.3.0
pip                                                     24.1.1
prompt-toolkit                                          3.0.43
pybricksdev                                             1.0.0a48
pycparser                                               2.22
Pygments                                                2.18.0
pypiwin32                                               223
pyserial                                                3.5
pyusb                                                   1.2.1
pywin32                                                 306
reactivex                                               4.0.4
requests                                                2.31.0
semver                                                  2.13.0
setuptools                                              69.5.1
style                                                   1.1.0
tqdm                                                    4.66.4
typing_extensions                                       4.11.0
urllib3                                                 2.2.1
wcwidth                                                 0.2.13
winrt-runtime                                           2.0.1
winrt-Windows.Devices.Bluetooth                         2.0.1
winrt-Windows.Devices.Bluetooth.Advertisement           2.0.1
winrt-Windows.Devices.Bluetooth.GenericAttributeProfile 2.0.1
winrt-Windows.Devices.Enumeration                       2.0.1
winrt-Windows.Foundation                                2.0.1
winrt-Windows.Foundation.Collections                    2.0.1
winrt-Windows.Storage.Streams                           2.0.1

dlech Jun 30, 2024
Collaborator

FYI, I just published pybricksdev==v1.0.0-alpha.49 that should fix this bug.

vascolp Jun 30, 2024
Author

There is something wrong...


--- Logging error ---
Traceback (most recent call last):
  File "D:\Program Files\Python312\Lib\logging\__init__.py", line 1160, in emit
    msg = self.format(record)
          ^^^^^^^^^^^^^^^^^^^
  File "D:\Program Files\Python312\Lib\logging\__init__.py", line 999, in format
    return fmt.format(record)
           ^^^^^^^^^^^^^^^^^^
  File "D:\Program Files\Python312\Lib\logging\__init__.py", line 703, in format
    record.message = record.getMessage()
                     ^^^^^^^^^^^^^^^^^^^
  File "D:\Program Files\Python312\Lib\logging\__init__.py", line 392, in getMessage
    msg = msg % self.args
          ~~~~^~~~~~~~~~~
  File "D:\NB11124\kivy_venv230\Lib\site-packages\pybricksdev\ble\lwp3\messages.py", line 537, in __repr__
    return f"{self.__class__.__name__}({repr(self.port)}, {repr(self.device)}, {repr(self.hw_ver)}, {repr(self.fw_ver)})"
                                             ^^^^^^^^^
  File "D:\NB11124\kivy_venv230\Lib\site-packages\pybricksdev\ble\lwp3\messages.py", line 494, in port
    return PortID(self._data[3])
           ^^^^^^^^^^^^^^^^^^^^^
  File "D:\Program Files\Python312\Lib\enum.py", line 761, in __call__
    raise TypeError(
TypeError: <enum 'PortID'> has no members; specify `names=()` if you meant to create a new, empty, enum
Call stack:
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "D:\NB11124\kivy_venv230\Scripts\pybricksdev.exe\__main__.py", line 7, in <module>
    sys.exit(main())
  File "D:\NB11124\kivy_venv230\Lib\site-packages\pybricksdev\cli\__init__.py", line 389, in main
    asyncio.run(subparsers.choices[args.tool].tool.run(args))
  File "D:\Program Files\Python312\Lib\asyncio\runners.py", line 194, in run
    return runner.run(main)
  File "D:\Program Files\Python312\Lib\asyncio\runners.py", line 118, in run
    return self._loop.run_until_complete(task)
  File "D:\Program Files\Python312\Lib\asyncio\base_events.py", line 674, in run_until_complete
    self.run_forever()
  File "D:\Program Files\Python312\Lib\asyncio\windows_events.py", line 322, in run_forever
    super().run_forever()
  File "D:\Program Files\Python312\Lib\asyncio\base_events.py", line 641, in run_forever
    self._run_once()
  File "D:\Program Files\Python312\Lib\asyncio\base_events.py", line 1987, in _run_once
    handle._run()
  File "D:\Program Files\Python312\Lib\asyncio\events.py", line 88, in _run
    self._context.run(self._callback, *self._args)
  File "D:\NB11124\kivy_venv230\Lib\site-packages\pybricksdev\cli\lwp3\repl.py", line 159, in handle_notify
    logger.info("received: %s", msg)
Unable to print the message and arguments - possible formatting error.
Use the traceback above to help find the error.
Type message and press ENTER to send. Press CTRL+D to exit.

dlech Jun 30, 2024
Collaborator

If you think you found a bug in pybricksdev, better to report it at https://github.com/pybricks/pybricksdev and include the steps to reproduce the problem.

vascolp · 2024-06-30T19:23:31Z

vascolp
Jun 30, 2024
Author

Another thing, I decided to try with a CityHub instead of the Remote and the cityhub replies to me, although it does not change its name. It replies with b'\x05\x00\x050\x05', I think five is generic error ...

0 replies

vascolp · 2024-06-30T19:32:52Z

vascolp
Jun 30, 2024
Author

AAAAAaaaaaaaaaaaaaaaaaaaaaa! Stupid me!!!! Should be b'\x05\x00\x01\x01\x02', instead of b'\0x05\0x00\0x01\0x01\0x02'!!!
Sorry Sorry Sorry! How did I missed it!

0 replies

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Changing Lego Remote Handset name ... #1607

vascolp Jun 30, 2024

Description

Replies: 4 comments · 6 replies

dlech Jun 30, 2024 Collaborator

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