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This fixes two issues that caused BLE connections to hang on macOS
when not using the --debug flag:
1. Race condition in BLEClient event loop initialization
- The event loop thread was started but asyncio operations were
submitted before the loop was actually running
- Added threading.Event synchronization to ensure the event loop
is running before any operations are submitted
- The ready signal is sent from within the loop via call_soon()
to guarantee the loop is truly active
2. CoreBluetooth callback delivery on macOS
- On macOS, CoreBluetooth requires occasional I/O operations for
callbacks to be properly delivered to the main thread
- Without --debug, no I/O was happening, causing callbacks to
never be processed and operations to hang indefinitely
- Added sys.stdout.flush() call before waiting for async results
to trigger the necessary I/O
The --debug flag masked these issues because:
- Debug logging introduces timing delays that let the event loop start
- Logger I/O triggers the necessary callback delivery mechanism
Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>