Kiiroo Onyx+ drops BLE link after ~3 s of silence

[lampanlampe]

Describe the bug
The Kiiroo Onyx+ silently tears down its BLE link when no command has been written for roughly 3 seconds. The device flashes red and only a power-cycle brings it back. Any .funscript-style scripted driver that has a gap of more than ~3 s between actions disconnects the toy mid-scene.

The protocol is missing a keepalive_strategy() override on their ProtocolHandler, so they fall back to the default HardwareRequiredRepeatLastPacketStrategy, which only takes effect on iOS during backgrounding. On every other platform (Android, desktop, headless intiface-engine) the BLE link is therefore left to time out.

Expected behavior
ProtocolHandler::keepalive_strategy() for KiirooV21Initialized should return ProtocolKeepaliveStrategy::RepeatLastPacketStrategyWithTiming(Duration) with an interval comfortably under the device's ~3 s idle timeout, so that scripted playback with arbitrary gaps keeps the link alive without altering the toy's behaviour.

Additional context

• Only tested with Onyx+ (but I assume that implementing a keepalive_strategy wouldn't negatively effect other kiirooV21 devices)
• I found a workaround from 2022 that is post-processing .funscript files with an Python script that interpolates positions to keep gaps < 2s: https://discuss.eroscripts.com/t/a-python-script-to-fix-funscript-for-kiiroo-onyx/49593

[qdot]

Thanks!