Comments (6)
hbldh
commented on August 23, 2024
You have forgotten an await before client.write_gatt_char; that method is still a coroutine. It might be the reason for the FileLoadException, but I am not sure.
I just released verion 0.4.0 of bleak; install that from PyPI and run the service_explorer.py example on your peripheral and show me your output here. It should display all services and characteristics discovered on the peripheral, similar to Bluetooth LE Explorer.
In 0.4.0, the client.services now returns a BleakGATTServiceCollection which should be simpler to handle than the .NET objects returned in v0.3.0.
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skjerns
commented on August 23, 2024
Thanks for the fast reply!
With this output, all services and their characteristics get printed as expected, just like in Bluetooth LE Explorer :) and it doesn't throw the UUID not found Exception anymore when paging the rw_charac.
However, when I request a write operation with response, I get no response:
await client.write_gatt_char(rw_charac, b'~HELLO', response=True)
# nothing happens. also running the script above again, no Value is put outOutput of the service_explorer:
click me
[Service] 00001800-0000-1000-8000-00805f9b34fb: Generic Access Profile
[Characteristic] 00002a00-0000-1000-8000-00805f9b34fb: (read) | Name: , Value: b'DeviceName'
[Characteristic] 00002a01-0000-1000-8000-00805f9b34fb: (read) | Name: , Value: b'\x00\x00'
[Service] 00001801-0000-1000-8000-00805f9b34fb: Generic Attribute Profile
[Characteristic] 00002a05-0000-1000-8000-00805f9b34fb: (indicate) | Name: , Value: None
[Descriptor] 00002902-0000-1000-8000-00805f9b34fb: (Handle: 15) | Value: b'\x00\x00'
[Service] 0000180a-0000-1000-8000-00805f9b34fb: Device Information
[Characteristic] 00002a29-0000-1000-8000-00805f9b34fb: (read) | Name: , Value: b'Microchip'
[Characteristic] 00002a24-0000-1000-8000-00805f9b34fb: (read) | Name: , Value: b'RNXXXX'
[Characteristic] 00002a25-0000-1000-8000-00805f9b34fb: (read) | Name: , Value: b'0000'
[Characteristic] 00002a27-0000-1000-8000-00805f9b34fb: (read) | Name: , Value: b'5505 1XXX3'
[Characteristic] 00002a26-0000-1000-8000-00805f9b34fb: (read) | Name: , Value: b'XXXXX'
[Characteristic] 00002a28-0000-1000-8000-00805f9b34fb: (read) | Name: , Value: b'X.XX'
[Characteristic] 00002a23-0000-1000-8000-00805f9b34fb: (read) | Name: , Value: b'\x00\x00\x00\x00\x00\x00\x00\x00'
[Characteristic] 00002a2a-0000-1000-8000-00805f9b34fb: (read) | Name: , Value: b'\x00\x00\x00\x00\x01\x00\x00\x00'
[Service] 49535343-fe7d-4ae5-8fa9-9fafd205e455: Unknown
[Characteristic] 49535343-1e4d-4bd9-ba61-23c647249616: (write-without-response,write,notify,indicate) | Name: , Value: None
[Descriptor] 00002902-0000-1000-8000-00805f9b34fb: (Handle: 83) | Value: b'\x00\x00'
[Characteristic] 49535343-8841-43f4-a8d4-ecbe34729bb3: (write-without-response,write) | Name: , Value: None
[Characteristic] 49535343-4c8a-39b3-2f49-511cff073b7e: (write,notify) | Name: , Value: None
[Descriptor] 00002902-0000-1000-8000-00805f9b34fb: (Handle: 88) | Value: b'\x00\x00'
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hbldh
commented on August 23, 2024
The response=True mean that the write method is used rather than the write-without-response. The response does not contain anything special though (https://docs.microsoft.com/en-us/uwp/api/windows.devices.bluetooth.genericattributeprofile.gattwriteresult), so nothing is returned by the write_gatt_char method.
You can check the value of your characteristic by a read afterwards to verify that your data has been written:
value = await client.read_gatt_char(rw_charac)
print("Pre-Write Value: {0}".format(value))
await client.write_gatt_char(rw_charac, b'~HELLO', response=True)
value = await client.read_gatt_char(rw_charac)
print("Post-Write Value: {0}".format(value))from bleak.
skjerns
commented on August 23, 2024
Somehow I can't read from this characteristic.
BleakError: Could not read characteristic value for 49535343-1e4d-4bd9-ba61-23c647249616: 2
which makes sense, as permissions for this attribute are
(write-without-response,write,notify,indicate)
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hbldh
commented on August 23, 2024
Ah, i did not see that; of course it fails. The read was not important anyway, it was just meant to visualize what the write achieved.
The issue in general is to be regarded as closed then? There is nothing left to solve of the original request is there?
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skjerns
commented on August 23, 2024
Yes, I'll open another issue for the non-response :) thank's!
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