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fix: Correct D-Bus signal subscription for properties changed

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Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>
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Tanner Collin
2025-12-31 00:08:24 +00:00
parent b0b5905169
commit b5ee0b5df2
1 changed files with 15 additions and 8 deletions
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23
scan.py
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@@ -7,7 +7,7 @@ logging.basicConfig(stream=sys.stdout,
import asyncio import asyncio
from dbus_next.aio import MessageBus from dbus_next.aio import MessageBus
from dbus_next.constants import BusType from dbus_next.constants import BusType, MessageType
from dbus_next import Message from dbus_next import Message
BLUEZ_SERVICE = 'org.bluez' BLUEZ_SERVICE = 'org.bluez'
@@ -55,6 +55,14 @@ def on_interfaces_added(path, interfaces):
# Log repeat discoveries only if they have a name # Log repeat discoveries only if they have a name
logging.info(f"Found: {alias} ({addr_str})") logging.info(f"Found: {alias} ({addr_str})")
def properties_changed_handler(message: Message):
"""Sync handler to dispatch async task for property changes."""
if message.message_type == MessageType.SIGNAL and \
message.member == 'PropertiesChanged' and \
message.interface == 'org.freedesktop.DBus.Properties':
# Further filtering is done in the async handler
asyncio.create_task(on_properties_changed(message))
async def on_properties_changed(message: Message): async def on_properties_changed(message: Message):
"""Callback for when a device's properties change (e.g., Alias appears).""" """Callback for when a device's properties change (e.g., Alias appears)."""
if not message.body or message.body[0] != DEVICE_IFACE: if not message.body or message.body[0] != DEVICE_IFACE:
@@ -103,13 +111,12 @@ async def main():
obj_manager_iface.on_interfaces_added(on_interfaces_added) obj_manager_iface.on_interfaces_added(on_interfaces_added)
# Subscribe to PropertiesChanged signal to catch late-arriving device names # Subscribe to PropertiesChanged signal to catch late-arriving device names
await bus.add_match( rule = "type='signal',interface='org.freedesktop.DBus.Properties',member='PropertiesChanged',path_namespace='/org/bluez'"
on_properties_changed, introspection = await bus.introspect('org.freedesktop.DBus', '/org/freedesktop/DBus')
mtype='signal', proxy_obj = bus.get_proxy_object('org.freedesktop.DBus', '/org/freedesktop/DBus', introspection)
iface='org.freedesktop.DBus.Properties', dbus_interface = proxy_obj.get_interface('org.freedesktop.DBus')
member='PropertiesChanged', await dbus_interface.call_add_match(rule)
path_namespace='/org/bluez' bus.add_message_handler(properties_changed_handler)
)
logging.info("Starting Bluetooth scan... Press Ctrl+C to stop.") logging.info("Starting Bluetooth scan... Press Ctrl+C to stop.")
try: try: