(pybricks-dev): ImportError: cannot import name 'BLEPUPConnection' from 'pybricksdev.connections'

[tiagozip]

When using the pybricks-dev library, on the examples' code, I get the following error:

1. Jupyter-notebook

2. Visual Studio Code

[dlech]

The connection code should look more like this:

from pybricksdev.connections import PybricksHub
from pybricksdev.ble import find_device

hub = PybricksHub()
device = await find_device('Pybricks Hub')
await hub.connect(device)

[tiagozip]

Yes, of course! 😄

[dlech]

Assuming this is not in a Jupyter notebook, the program should look more like this (everything is done inside the event loop):

import asyncio

from pybricksdev.connections.pybricks import PybricksHub
from pybricksdev.ble import find_device

async def main():
    hub = PybricksHub()

    device = await find_device('Pybricks Hub')
    await hub.connect(device)

    # do stuff with connected hub
    ...

asyncio.run(main())

[tiagozip]

Hi! Thanks for the response. I used this code:

import asyncio

from pybricksdev.connections.pybricks import PybricksHub
from pybricksdev.ble import find_device
from pybricks.pupdevices import DCMotor
from pybricks.parameters import Port
from time import sleep

async def main():
    hub = PybricksHub()
    motor_left = DCMotor(Port.A)
    motor_right = DCMotor(Port.B)

    device = await find_device('Pybricks Hub')
    await hub.connect(device)

    motor_left.dc(50)
    motor_right.dc(-50)
    sleep(1000)
    motor_left.stop()
    motor_right.stop()

asyncio.run(main())

The hub is on and connected, near the PC, the PC has Bluetooth enabled, but I receive this timeout:

Traceback (most recent call last):
  File "c:\Users\<USER>\Desktop\<PATH>.py", line 23, in <module>
    asyncio.run(main())
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\lib\asyncio\runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\lib\asyncio\base_events.py", line 647, in run_until_complete       
    return future.result()
  File "c:\Users\<USER>\Desktop\<PATH>.py", line 14, in main
    device = await find_device('Pybricks Hub')
  File "C:\Users\<USER>\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\pybricksdev\ble\__init__.py", line 62, in find_device
    raise asyncio.TimeoutError
asyncio.exceptions.TimeoutError

[laurensvalk]

Before we get into the details, can you describe what you would like to achieve?

It seems that you are currently mixing code that would run on the hub and code that should run on the PC.

Could it be done with code.pybricks.com or is the PC/Python interface required in your application?

[tiagozip]

I need the python interface, because with it I can install libraries such as BlueDot