BLE onConnectedStateChanged not triggered on Instinct 2S Solar with Raspberry Pi 5

I'm developing a Connect IQ app for the Instinct 2S Solar watch, aiming to communicate with a Raspberry Pi 5 over BLE.

Currently, I can successfully scan and detect the Pi using . I'm using the BLE structure based on Jim Miller’s Connect IQ / Raspberry Pi tutorial. However, after calling , the app never triggers the onConnectedStateChanged() callback, even though the Pi receives the connection.Ble.scan()Ble.pairDevice(result)

My questions:

1. Why is onConnectedStateChanged() not being called, even though the Pi reports a connection?

2. Is it possible to exchange information (e.g., battery level, heart rate) directly between the watch and Pi over BLE?

3. Can this communication work without involving a phone (i.e., only between the watch and Pi)?

Any help or guidance would be appreciated!

Thank you!