I want to use Python to connect up to a bluetooth device and utilize that as a speaker. For example, use Python to play .wav and hear on device and validate it is being played etc. I than want to play audio on my linux box and listen to it on the bluetooth device.
I was doing some looking on stackoverflow and it seems I can use pybluez to connect, but then need to use dbus to set up the actual audio connection. I found Linux BlueZ dbus communication a2dp, but it results in:
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.UnknownMethod: Method "DefaultAdapter" with signature "" on interface "org.bluez.Manager" doesn't exist
When it tries to get the default adapter off the interface, so I do not even get to the original posters issue. Thank you for any help! Here is the code:
import dbus as dbus
bus = dbus.SystemBus()
man = bus.get_object('org.bluez', '/')
iface = dbus.Interface(man, 'org.bluez.Manager')
adapterPath = iface.DefaultAdapter()
adapter = dbus.Interface(bus.get_object('org.bluez', adapterPath),dbus_interface='org.bluez.Adapter')
devices = adapter.GetProperties()['Devices']
for d in devices:
dev = dbus.Interface(bus.get_object('org.bluez', d),dbus_interface='org.bluez.Device')
props = dev.GetProperties()
if any(AudioSourceServiceClass_UUID in UUID.upper() for UUID in props["UUIDs"]):
devobj = bus.get_object('org.bluez', d)
devobj.Trusted = True
if props["Connected"] == True:
print props["Name"] + " is connected!"
exit()
for d in devices:
dev = dbus.Interface(bus.get_object('org.bluez', d),dbus_interface='org.bluez.Device')
props = dev.GetProperties()
if any(AudioSourceServiceClass_UUID in UUID.upper() for UUID in props["UUIDs"]):
#This device is an A2DP Audio source
print props["Name"] + " has A2DP audio source"
#dev.connect_to_signal("PropertyChanged", handler_for_device(dev))
#dev.connect_to_signal("PropertyChanged", cb)
devobj = bus.get_object('org.bluez', d)
try:
devobj.Connect(dbus_interface='org.bluez.AudioSource')
devobj.Play()
exit()
except dbus.DBusException, e:
print str(e)
I have two questions.
The reason this code is not working is that the org.bluez.Manager class is no longer supported in bluez 5.0
Vaguely described here: http://www.bluez.org/bluez-5-api-introduction-and-porting-guide/
There are some examples in the bluez source code, ie: test/list-devices here: https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/test/list-devices
Here is a python3 version of that code:
from __future__ import absolute_import, print_function, unicode_literals
import dbus
bus = dbus.SystemBus()
manager = dbus.Interface(bus.get_object("org.bluez", "/"),
"org.freedesktop.DBus.ObjectManager")
def extract_objects(object_list):
list = ""
for object in object_list:
val = str(object)
list = list + val[val.rfind("/") + 1:] + " "
return list
def extract_uuids(uuid_list):
list = ""
for uuid in uuid_list:
if (uuid.endswith("-0000-1000-8000-00805f9b34fb")):
if (uuid.startswith("0000")):
val = "0x" + uuid[4:8]
else:
val = "0x" + uuid[0:8]
else:
val = str(uuid)
list = list + val + " "
return list
objects = manager.GetManagedObjects()
all_devices = (str(path) for path, interfaces in objects.items() if
"org.bluez.Device1" in interfaces.keys())
for path, interfaces in objects.items():
if "org.bluez.Adapter1" not in interfaces.keys():
continue
print("[ " + path + " ]")
properties = interfaces["org.bluez.Adapter1"]
for key in properties.keys():
value = properties[key]
if (key == "UUIDs"):
list = extract_uuids(value)
print(" %s = %s" % (key, list))
else:
print(" %s = %s" % (key, value))
device_list = [d for d in all_devices if d.startswith(path + "/")]
for dev_path in device_list:
print(" [ " + dev_path + " ]")
dev = objects[dev_path]
properties = dev["org.bluez.Device1"]
for key in properties.keys():
value = properties[key]
if (key == "UUIDs"):
list = extract_uuids(value)
print(" %s = %s" % (key, list))
elif (key == "Class"):
print(" %s = 0x%06x" % (key, value))
elif (key == "Vendor"):
print(" %s = 0x%04x" % (key, value))
elif (key == "Product"):
print(" %s = 0x%04x" % (key, value))
elif (key == "Version"):
print(" %s = 0x%04x" % (key, value))
else:
print(" %s = %s" % (key, value))
print("")