Characteristic with UUID could not be found #1493
Comments
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Bleak is meant to be run as a normal user, not root. If you run the service explorer example, is the 2A24 characteristic listed? |
I can't see it, here is the output : root@einstein:~# python3 service_explorer.py --address 3C:A5:50:81:D7:C6
2024-01-09 17:19:12,083 __main__ INFO: starting scan...
2024-01-09 17:19:13,569 __main__ INFO: connecting to device...
2024-01-09 17:19:14,768 __main__ INFO: connected
2024-01-09 17:19:14,770 __main__ INFO: [Service] 0000ffe0-0000-1000-8000-00805f9b34fb (Handle: 8): Vendor specific
2024-01-09 17:19:14,772 __main__ INFO: [Characteristic] 0000ffe3-0000-1000-8000-00805f9b34fb (Handle: 15): Vendor specific (write-without-response,write)
2024-01-09 17:19:14,806 __main__ INFO: [Descriptor] 00002902-0000-1000-8000-00805f9b34fb (Handle: 17): Client Characteristic Configuration, Value: bytearray(b'\x00\x00')
2024-01-09 17:19:14,807 __main__ INFO: [Characteristic] 0000ffe1-0000-1000-8000-00805f9b34fb (Handle: 9): Vendor specific (write-without-response,write,notify)
2024-01-09 17:19:14,836 __main__ INFO: [Descriptor] 00002902-0000-1000-8000-00805f9b34fb (Handle: 11): Client Characteristic Configuration, Value: bytearray(b'\x00\x00')
2024-01-09 17:19:14,837 __main__ INFO: [Characteristic] 0000ffe2-0000-1000-8000-00805f9b34fb (Handle: 12): Vendor specific (write-without-response,write,notify)
2024-01-09 17:19:14,866 __main__ INFO: [Descriptor] 00002902-0000-1000-8000-00805f9b34fb (Handle: 14): Client Characteristic Configuration, Value: bytearray(b'\x00\x00')
2024-01-09 17:19:14,868 __main__ INFO: disconnecting...
2024-01-09 17:19:17,257 __main__ INFO: disconnected |
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Then either the device doesn't have that characteristic or BlueZ is hiding it. You could log Bluetooth packets to see if the device actually provides this characteristic. |
dlech
added
3rd party issue
This is the VendorString right ? Does it mean that if this device do not have this characteristic prevent from using it in Bleak ? I used btmon, is this log usefull ? Bluetooth monitor ver 5.55
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Hello, |
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@Honusnap if you can proceed with this others would be very thankful! |
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Here some data from the BlueZ (version 5.55) dbus from a JKBMS where "00002a24-0000-1000-8000-00805f9b34fb" is not found. This indicates that the data is already missing in BlueZ right? manuel@raspberrypi2:~# dbus-send --system --dest=org.bluez --print-reply /org/bluez/hci0/dev_20_22_08_25_17_41 org.freedesktop.DBus.Properties.GetAll string:"org.bluez.Device1"
method return time=1708694825.738213 sender=:1.225 -> destination=:1.284 serial=102 reply_serial=2
array [
dict entry(
string "Address"
variant string "20:22:08:25:17:41"
)
dict entry(
string "AddressType"
variant string "public"
)
dict entry(
string "Name"
variant string "JK_BD4A24S04"
)
dict entry(
string "Alias"
variant string "JK_BD4A24S04"
)
dict entry(
string "Paired"
variant boolean false
)
dict entry(
string "Trusted"
variant boolean true
)
dict entry(
string "Blocked"
variant boolean false
)
dict entry(
string "LegacyPairing"
variant boolean false
)
dict entry(
string "Connected"
variant boolean true
)
dict entry(
string "UUIDs"
variant array [
string "0000ffe0-0000-1000-8000-00805f9b34fb"
]
)
dict entry(
string "Adapter"
variant object path "/org/bluez/hci0"
)
dict entry(
string "ManufacturerData"
variant array [
dict entry(
uint16 19274
variant array of bytes [
00 01
]
)
]
)
dict entry(
string "ServicesResolved"
variant boolean true
)
dict entry(
string "AdvertisingFlags"
variant array of bytes [
06
]
)
]
manuel@raspberrypi2:~# bluetoothctl info 20:22:08:25:17:41
Device 20:22:08:25:17:41 (public)
Name: JK_BD4A24S04
Alias: JK_BD4A24S04
Paired: no
Trusted: yes
Blocked: no
Connected: yes
LegacyPairing: no
UUID: Unknown (0000ffe0-0000-1000-8000-00805f9b34fb)
ManufacturerData Key: 0x4b4a
ManufacturerData Value:
00 01 ..
AdvertisingFlags:
06 . |
bluetoothctl -v) in case of Linux: 5.55Description
I'm using an other project called dbus-serialbattery, it use Bleak API to connect to bluetooth devices. I've narrowed the error at this command
client = BleakClient(3C:A5:50:81:D7:C6)
Error => Characteristic with UUID 00002a24-0000-1000-8000-00805f9b34fb could not be found!
Using "bluetoothctl connect 3C:A5:50:81:D7:C6" work and return a "connected" message
There is a PIN code for this device and it has been paired succesfully in bluetoothctl
Logs
I then created 2 test scripts ( BleakTest1.py and BleakTest2.py) with your 2 examples here : https://bleak.readthedocs.io/en/latest/usage.html and have included my own address for the "address" constant.
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