[PyQt] Strange error with QtBluetooth.QLowEnergyService

[Florian Bruhin]

On Thu, Nov 07, 2019 at 02:43:00PM +0100, s.achterop at rug.nl wrote:
>   Hello list,
> 
> I am working on a BLE app on PyQt5 and am getting an error I don't understand.
> 
> With the following snippet:
> 
>    from PyQt5 import QtBluetooth as QtBt
> 
>    QtBt.QLowEnergyService.writeCharacteristic(QtBt.QLowEnergyCharacteristic.Unknown, 'asdf')
> 
> I get the following error:
> 
>   TypeError: writeCharacteristic(self, QLowEnergyCharacteristic, Union[QByteArray, bytes, bytearray], ...
>       ... mode: QLowEnergyService.WriteMode = QLowEnergyService.WriteWithResponse): first argument of unbound method must have type 'QLowEnergyService'
> 
> But from what I see, the type is correct.
> What am doing wrong here?

You're calling a method which is intended to be called on an instance on a
class instead.

You should get a QLowEnergyService instance from somewhere, and call
writeCharacteristic on that.

Florian

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