Two way communication using Python (bleak) / Cannot discover services & characteristics

Hi! This sounds like a great project!

With Bleak, did you try the code on https://www.espruino.com/Interfacing#bluetooth-le ? What error messages do you get?

Actually trying to directly make HTTP requests from the Puck via some means is going to be difficult, but I feel like you've got a few different options:

• Use the EspruinoHub project on the Raspberry Pi, which will bridge Bluetooth to MQTT. You can even plug it into 'Home Assistant': https://github.com/espruino/EspruinoHub#home-assistant-integration
  
• Use the code from https://www.espruino.com/BLE+Advertising so you're using Bluetooth Advertising from the Puck. This isn't quite as flexible (it's not two-way to the Puck) but it is super robust and easy (it's what the EspruinoHub stuff used by default too).
  
• Make the Puck a Bluetooth HID keyboard (https://www.espruino.com/BLE+Keyboard) - you can then just pair it with the PC/Raspberry Pi and make it 'fake' different keypresses to do what you want. I've seen Pucks used this way for accessibility a few times.