Hello,
You can use the Bluetooth SPP.
I have done this with an app on my phone such as:
Bluetooth RGB
And also with an Arduino + HC05, an app written with Ketai library for an Android device (phone and tablet) and across two PCs.
On the W10 PC side find “More Bluetooth Options” and set up a COM port:
You can then use the Processing serial library to communicate over the COM port:
Processing does not know it is serial over Bluetooth, serial over USB or otherwise… it is just serial communication over a COM port.
:)