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BleakError: "service already present" with duplicate UUID when enumerating services

See original GitHub issue
  • bleak version: 0.5.1
  • Python version: Python 3.7.3
  • Operating System: Ubuntu 19.04
  • BlueZ version (bluetoothctl -v) in case of Linux: 5.50

Description

First off, thanks for the library! It’s been fun to tinker with so far. As a warning, I am new to Bluetooth generally.

I’m trying to connect to an esoteric BLE device, and so far Bleak has been throwing an exception during characteristics enumeration. It appears to be due to two characteristics having the same UUID. I saw #101, but this appears to be due to a device actually reporting a duplicate UUID rather than a missed initialization.

I can confirm this is the case with this device with gatttool. Notice how the UUID 00002a06-0000-1000-8000-00805f9b34fb is duplicated for handles 0x0024 and 0x0027:

$ gatttool -b f8:30:02:1e:9c:ba --primary
attr handle = 0x0001, end grp handle = 0x000b uuid: 00001800-0000-1000-8000-00805f9b34fb
attr handle = 0x000c, end grp handle = 0x000f uuid: 00001801-0000-1000-8000-00805f9b34fb
attr handle = 0x0010, end grp handle = 0x0022 uuid: 0000180a-0000-1000-8000-00805f9b34fb
attr handle = 0x0023, end grp handle = 0x0025 uuid: 00001803-0000-1000-8000-00805f9b34fb
attr handle = 0x0026, end grp handle = 0x0028 uuid: 00001802-0000-1000-8000-00805f9b34fb
attr handle = 0x0029, end grp handle = 0x002c uuid: 00001804-0000-1000-8000-00805f9b34fb
attr handle = 0x002d, end grp handle = 0x0032 uuid: 0000180f-0000-1000-8000-00805f9b34fb
attr handle = 0x0033, end grp handle = 0x003a uuid: 0000ccc0-0000-1000-8000-00805f9b34fb
attr handle = 0x003b, end grp handle = 0x0045 uuid: 0000aa40-0000-1000-8000-00805f9b34fb
attr handle = 0x0046, end grp handle = 0xffff uuid: f000ffc0-0451-4000-b000-000000000000
$ gatttool -b f8:30:02:1e:9c:ba --characteristics 
handle = 0x0002, char properties = 0x02, char value handle = 0x0003, uuid = 00002a00-0000-1000-8000-00805f9b34fb
handle = 0x0004, char properties = 0x02, char value handle = 0x0005, uuid = 00002a01-0000-1000-8000-00805f9b34fb
handle = 0x0006, char properties = 0x0a, char value handle = 0x0007, uuid = 00002a02-0000-1000-8000-00805f9b34fb
handle = 0x0008, char properties = 0x08, char value handle = 0x0009, uuid = 00002a03-0000-1000-8000-00805f9b34fb
handle = 0x000a, char properties = 0x02, char value handle = 0x000b, uuid = 00002a04-0000-1000-8000-00805f9b34fb
handle = 0x000d, char properties = 0x20, char value handle = 0x000e, uuid = 00002a05-0000-1000-8000-00805f9b34fb
handle = 0x0011, char properties = 0x02, char value handle = 0x0012, uuid = 00002a23-0000-1000-8000-00805f9b34fb
handle = 0x0013, char properties = 0x02, char value handle = 0x0014, uuid = 00002a24-0000-1000-8000-00805f9b34fb
handle = 0x0015, char properties = 0x02, char value handle = 0x0016, uuid = 00002a25-0000-1000-8000-00805f9b34fb
handle = 0x0017, char properties = 0x02, char value handle = 0x0018, uuid = 00002a26-0000-1000-8000-00805f9b34fb
handle = 0x0019, char properties = 0x02, char value handle = 0x001a, uuid = 00002a27-0000-1000-8000-00805f9b34fb
handle = 0x001b, char properties = 0x02, char value handle = 0x001c, uuid = 00002a28-0000-1000-8000-00805f9b34fb
handle = 0x001d, char properties = 0x02, char value handle = 0x001e, uuid = 00002a29-0000-1000-8000-00805f9b34fb
handle = 0x001f, char properties = 0x02, char value handle = 0x0020, uuid = 00002a2a-0000-1000-8000-00805f9b34fb
handle = 0x0021, char properties = 0x02, char value handle = 0x0022, uuid = 00002a50-0000-1000-8000-00805f9b34fb
handle = 0x0024, char properties = 0x0a, char value handle = 0x0025, uuid = 00002a06-0000-1000-8000-00805f9b34fb
handle = 0x0027, char properties = 0x04, char value handle = 0x0028, uuid = 00002a06-0000-1000-8000-00805f9b34fb
handle = 0x002a, char properties = 0x12, char value handle = 0x002b, uuid = 00002a07-0000-1000-8000-00805f9b34fb
handle = 0x002e, char properties = 0x12, char value handle = 0x002f, uuid = 00002a19-0000-1000-8000-00805f9b34fb
handle = 0x0034, char properties = 0x12, char value handle = 0x0035, uuid = 0000ccc1-0000-1000-8000-00805f9b34fb
handle = 0x0037, char properties = 0x08, char value handle = 0x0038, uuid = 0000ccc2-0000-1000-8000-00805f9b34fb
handle = 0x0039, char properties = 0x08, char value handle = 0x003a, uuid = 0000ccc3-0000-1000-8000-00805f9b34fb
handle = 0x003c, char properties = 0x12, char value handle = 0x003d, uuid = 0000aa41-0000-1000-8000-00805f9b34fb
handle = 0x003f, char properties = 0x0a, char value handle = 0x0040, uuid = 0000aa42-0000-1000-8000-00805f9b34fb
handle = 0x0041, char properties = 0x0a, char value handle = 0x0042, uuid = 0000aa44-0000-1000-8000-00805f9b34fb
handle = 0x0043, char properties = 0x02, char value handle = 0x0044, uuid = 0000aa43-0000-1000-8000-00805f9b34fb
handle = 0x0047, char properties = 0x1c, char value handle = 0x0048, uuid = f000ffc1-0451-4000-b000-000000000000
handle = 0x004b, char properties = 0x1c, char value handle = 0x004c, uuid = f000ffc2-0451-4000-b000-000000000000

I expect to still be able to send commands to the device, as gatttool has no problems doing so. However, Bleak can’t handle it.

What I Did

Running a simple Bleak connection script with debug logging provides:

DEBUG:bleak.backends.bluezdbus.client:Connecting to BLE device @ f8:30:02:1e:9c:ba with hci0
DEBUG:bleak.backends.bluezdbus.client:Connection successful.
DEBUG:bleak.backends.bluezdbus.client:Get Services...
DEBUG:bleak.backends.bluezdbus.client:
Primary Service
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0046
	f000ffc0-0451-4000-b000-000000000000
	Unknown
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0046/char004b
	f000ffc2-0451-4000-b000-000000000000
	Unknown
DEBUG:bleak.backends.bluezdbus.client:
Descriptor
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0046/char004b/desc004e
	00002901-0000-1000-8000-00805f9b34fb
	Characteristic User Description
DEBUG:bleak.backends.bluezdbus.client:
Descriptor
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0046/char004b/desc004d
	00002902-0000-1000-8000-00805f9b34fb
	Client Characteristic Configuration
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0046/char0047
	f000ffc1-0451-4000-b000-000000000000
	Unknown
DEBUG:bleak.backends.bluezdbus.client:
Descriptor
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0046/char0047/desc004a
	00002901-0000-1000-8000-00805f9b34fb
	Characteristic User Description
DEBUG:bleak.backends.bluezdbus.client:
Descriptor
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0046/char0047/desc0049
	00002902-0000-1000-8000-00805f9b34fb
	Client Characteristic Configuration
DEBUG:bleak.backends.bluezdbus.client:
Primary Service
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service003b
	0000aa40-0000-1000-8000-00805f9b34fb
	Vendor specific
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service003b/char0043
	0000aa43-0000-1000-8000-00805f9b34fb
	Vendor specific
DEBUG:bleak.backends.bluezdbus.client:
Descriptor
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service003b/char0043/desc0045
	00002902-0000-1000-8000-00805f9b34fb
	Client Characteristic Configuration
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service003b/char0041
	0000aa44-0000-1000-8000-00805f9b34fb
	Vendor specific
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service003b/char003f
	0000aa42-0000-1000-8000-00805f9b34fb
	Vendor specific
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service003b/char003c
	0000aa41-0000-1000-8000-00805f9b34fb
	Vendor specific
DEBUG:bleak.backends.bluezdbus.client:
Descriptor
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service003b/char003c/desc003e
	00002902-0000-1000-8000-00805f9b34fb
	Client Characteristic Configuration
DEBUG:bleak.backends.bluezdbus.client:
Primary Service
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0033
	0000ccc0-0000-1000-8000-00805f9b34fb
	Vendor specific
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0033/char0039
	0000ccc3-0000-1000-8000-00805f9b34fb
	Vendor specific
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0033/char0037
	0000ccc2-0000-1000-8000-00805f9b34fb
	Vendor specific
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0033/char0034
	0000ccc1-0000-1000-8000-00805f9b34fb
	Vendor specific
DEBUG:bleak.backends.bluezdbus.client:
Descriptor
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0033/char0034/desc0036
	00002902-0000-1000-8000-00805f9b34fb
	Client Characteristic Configuration
DEBUG:bleak.backends.bluezdbus.client:
Primary Service
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0029
	00001804-0000-1000-8000-00805f9b34fb
	Tx Power
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0029/char002a
	00002a07-0000-1000-8000-00805f9b34fb
	Tx Power Level
DEBUG:bleak.backends.bluezdbus.client:
Descriptor
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0029/char002a/desc002c
	00002902-0000-1000-8000-00805f9b34fb
	Client Characteristic Configuration
DEBUG:bleak.backends.bluezdbus.client:
Primary Service
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0026
	00001802-0000-1000-8000-00805f9b34fb
	Immediate Alert
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0026/char0027
	00002a06-0000-1000-8000-00805f9b34fb
	Alert Level
DEBUG:bleak.backends.bluezdbus.client:
Primary Service
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0023
	00001803-0000-1000-8000-00805f9b34fb
	Link Loss
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0023/char0024
	00002a06-0000-1000-8000-00805f9b34fb
	Alert Level
DEBUG:bleak.backends.bluezdbus.client:
Primary Service
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0010
	0000180a-0000-1000-8000-00805f9b34fb
	Device Information
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0010/char0021
	00002a50-0000-1000-8000-00805f9b34fb
	PnP ID
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0010/char001f
	00002a2a-0000-1000-8000-00805f9b34fb
	IEEE 11073-20601 Regulatory Cert. Data List
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0010/char001d
	00002a29-0000-1000-8000-00805f9b34fb
	Manufacturer Name String
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0010/char001b
	00002a28-0000-1000-8000-00805f9b34fb
	Software Revision String
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0010/char0019
	00002a27-0000-1000-8000-00805f9b34fb
	Hardware Revision String
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0010/char0017
	00002a26-0000-1000-8000-00805f9b34fb
	Firmware Revision String
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0010/char0015
	00002a25-0000-1000-8000-00805f9b34fb
	Serial Number String
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0010/char0013
	00002a24-0000-1000-8000-00805f9b34fb
	Model Number String
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service0010/char0011
	00002a23-0000-1000-8000-00805f9b34fb
	System ID
DEBUG:bleak.backends.bluezdbus.client:
Primary Service
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service000c
	00001801-0000-1000-8000-00805f9b34fb
	Generic Attribute Profile
DEBUG:bleak.backends.bluezdbus.client:
Characteristic
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service000c/char000d
	00002a05-0000-1000-8000-00805f9b34fb
	Service Changed
DEBUG:bleak.backends.bluezdbus.client:
Descriptor
	/org/bluez/hci0/dev_F8_30_02_1E_9C_BA/service000c/char000d/desc000f
	00002902-0000-1000-8000-00805f9b34fb
	Client Characteristic Configuration
Traceback (most recent call last):
  File "<workspace>/main.py", line 18, in <module>
    loop.run_until_complete(main(loop))
  File "/usr/lib/python3.7/asyncio/base_events.py", line 584, in run_until_complete
    return future.result()
  File "<workspace>/main.py", line 11, in main
    async with BleakClient(address=ADDRESS, loop=loop) as client:
  File "<workspace>/venv/lib/python3.7/site-packages/bleak/backends/client.py", line 43, in __aenter__
    await self.connect()
  File "<workspace>/venv/lib/python3.7/site-packages/bleak/backends/bluezdbus/client.py", line 136, in connect
    await self.get_services()
  File "<workspace>/venv/lib/python3.7/site-packages/bleak/backends/bluezdbus/client.py", line 250, in get_services
    BleakGATTCharacteristicBlueZDBus(char, object_path, _service[0].uuid)
  File "<workspace>/venv/lib/python3.7/site-packages/bleak/backends/service.py", line 120, in add_characteristic
    "This characteristic is already present in this BleakGATTServiceCollection!"
bleak.exc.BleakError: This characteristic is already present in this BleakGATTServiceCollection!

Process finished with exit code 1

Issue Analytics

  • State:closed
  • Created 4 years ago
  • Comments:8 (4 by maintainers)

github_iconTop GitHub Comments

3reactions
hbldhcommented, Jun 2, 2020

This issue needs a resolution. It will not be identical to @pliniofpa’s solution, but somewhere similar.

It might lead to a backwards incompatible solution, but I aim to be as not-interruptive as possible and issue DeprecationWarnings if possible.

My goal is to have this ready to release by the end of June.

1reaction
Ladviencommented, Jun 11, 2020

@hbldh, I do a lot of work with Bluetooth on all three platforms; more than happy to help if wanted and needed. Even if it’s just testing solutions.

And thanks again for bleak! Best “pointless project” ever. 😃

Read more comments on GitHub >

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