So I've observed an interesting quirk of bluez that only populates certain extra infor

How best to get extra information like RSSI and tx_power during scan about python-bluezero HOT 2 CLOSED

chadrockey commented on June 16, 2024

How best to get extra information like RSSI and tx_power during scan

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Comments (2)

chadrockey commented on June 16, 2024 1

Thanks! Hopefully this is searchable in the future for those having issues.

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ukBaz commented on June 16, 2024

Thanks for posting this here.

The dongle.nearby_discovery functionality was added to allow the discovery of nearby devices without the user having to create an eventloop and handle events asynchronously.

The scanner/observer functionality within Bluezero better demonstrates how to scan and get the RSSI values as the devices are discovered:

python-bluezero/bluezero/observer.py

Line 232 in 7cb8e8f

cls.dongle.on_device_found = cls.on_device_found

This uses the signals within the API PropertiesChanged , InterfacesAdded , and InterfacesRemoved

python-bluezero/bluezero/adapter.py

Lines 270 to 328 in 7cb8e8f

 def _properties_changed(self, interface, changed, invalidated, path): 

 """ 

  Handle DBus PropertiesChanged signal and 

  call appropriate user callback 

  """ 

 device_address = dbus_tools.get_device_address_from_dbus_path(path) 

 adapter_addr = dbus_tools.get_adapter_address_from_dbus_path(path) 

 if 'Connected' in changed: 

 if all((changed['Connected'], 

 self.address == adapter_addr, 

 self.on_connect)): 

 if tools.get_fn_parameters(self.on_connect) == 0: 

 self.on_connect() 

 elif tools.get_fn_parameters(self.on_connect) == 1: 

 new_dev = device.Device( 

 adapter_addr=self.address, 

 device_addr=device_address) 

 self.on_connect(new_dev) 

 elif tools.get_fn_parameters(self.on_connect) == 2: 

 self.on_connect(adapter_addr, device_address) 

 elif not changed['Connected'] and self.on_disconnect: 

 if tools.get_fn_parameters(self.on_disconnect) == 0: 

 logger.warning("using deprecated version of disconnect " 

 "callback, move to on_disconnect(dev) " 

 "with device parameter") 

 self.on_disconnect() 

 elif tools.get_fn_parameters(self.on_disconnect) == 1: 

 new_dev = device.Device( 

 adapter_addr=self.address, 

 device_addr=device_address) 

 self.on_disconnect(new_dev) 

 elif tools.get_fn_parameters(self.on_disconnect) == 2: 

 self.on_disconnect(self.address, device_address) 

 def _interfaces_added(self, path, device_info): 

 """ 

  Handle DBus InterfacesAdded signal and 

  call appropriate user callback 

  """ 

 dev_iface = constants.DEVICE_INTERFACE 

 if constants.DEVICE_INTERFACE in device_info: 

 dev_addr = device_info[dev_iface].get('Address') 

 dev_connected = device_info[dev_iface].get('Connected') 

 if self.on_device_found and dev_addr: 

 new_dev = device.Device( 

 adapter_addr=self.address, 

 device_addr=dev_addr) 

 self.on_device_found(new_dev) 

 if all((self.on_connect, dev_connected, dev_addr)): 

 new_dev = device.Device( 

 adapter_addr=self.address, 

 device_addr=dev_addr) 

 self.on_connect(new_dev) 

 def _interfaces_removed(self, path, device_info): 

 """ 

  Handle DBus InterfacesRemoved signal and 

  call appropriate user callback 

  """

from python-bluezero.

How best to get extra information like RSSI and tx_power during scan about python-bluezero HOT 2 CLOSED

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	def _properties_changed(self, interface, changed, invalidated, path):
	"""
	Handle DBus PropertiesChanged signal and
	call appropriate user callback
	"""
	device_address = dbus_tools.get_device_address_from_dbus_path(path)
	adapter_addr = dbus_tools.get_adapter_address_from_dbus_path(path)
	if 'Connected' in changed:
	if all((changed['Connected'],
	self.address == adapter_addr,
	self.on_connect)):
	if tools.get_fn_parameters(self.on_connect) == 0:
	self.on_connect()
	elif tools.get_fn_parameters(self.on_connect) == 1:
	new_dev = device.Device(
	adapter_addr=self.address,
	device_addr=device_address)
	self.on_connect(new_dev)
	elif tools.get_fn_parameters(self.on_connect) == 2:
	self.on_connect(adapter_addr, device_address)
	elif not changed['Connected'] and self.on_disconnect:
	if tools.get_fn_parameters(self.on_disconnect) == 0:
	logger.warning("using deprecated version of disconnect "
	"callback, move to on_disconnect(dev) "
	"with device parameter")
	self.on_disconnect()
	elif tools.get_fn_parameters(self.on_disconnect) == 1:
	new_dev = device.Device(
	adapter_addr=self.address,
	device_addr=device_address)
	self.on_disconnect(new_dev)
	elif tools.get_fn_parameters(self.on_disconnect) == 2:
	self.on_disconnect(self.address, device_address)

	def _interfaces_added(self, path, device_info):
	"""
	Handle DBus InterfacesAdded signal and
	call appropriate user callback
	"""
	dev_iface = constants.DEVICE_INTERFACE
	if constants.DEVICE_INTERFACE in device_info:
	dev_addr = device_info[dev_iface].get('Address')
	dev_connected = device_info[dev_iface].get('Connected')
	if self.on_device_found and dev_addr:
	new_dev = device.Device(
	adapter_addr=self.address,
	device_addr=dev_addr)
	self.on_device_found(new_dev)
	if all((self.on_connect, dev_connected, dev_addr)):
	new_dev = device.Device(
	adapter_addr=self.address,
	device_addr=dev_addr)
	self.on_connect(new_dev)

	def _interfaces_removed(self, path, device_info):
	"""
	Handle DBus InterfacesRemoved signal and
	call appropriate user callback
	"""