All Questions
Tagged with bluetooth-gatt characteristics
10
questions
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votes
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answers
15
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Receive simultaneous notifications for multiple characteristics from a single server
I am trying to reproduce an Android app project without much Android development or Bluetooth experience. In the code, the original author collected data from two characteristics (coming from a single ...
- 1
1
vote
1
answer
403
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Bluetooth GATT: Set value and flag field correct
i have some problems by understanding the flag field in Bluetooth characteristics.
For example the heart rate measurement characteristic:
And its flags:
According to my understanding, the first part ...
- 76
0
votes
1
answer
637
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Write value as (command) to a BLE characteristic via Javascript
I am working on a Project, and I am new to BLE, I have got problem with writing value to BLE characteristic (run command on BLE device).
The characteristic take these values:
0x04 0x01 – Lock mode is ...
- 1
0
votes
1
answer
513
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Conversion of heart rate measurements and characteristics notifications
I'm working on a Bluetooth Low Energy medical device and I used the bleak library to connect to the device and read or set data on it.
So far I've been able to connect to it and read data from ...
1
vote
1
answer
604
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onCharacteristicChanged not being hit. Android BLE
I have an app that is using BLE connectivity with my device. Everything works from connecting to the device, discovering the services, writing the characteristic and descriptor. But for some reason, ...
- 31
2
votes
1
answer
1k
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Receive notifications for multiple characteristics in Android
I have several characteristics (all under one service) that I would like to be notified of in my Android app. When I set the notification descriptor for one of them, it works well. I understand that ...
- 83
1
vote
1
answer
1k
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Writing characteristic property check is always false Android BluetoothGatt class
I want to create an android application in order to connect and retrieve data from an ESP32 board as well as the ability to send values to the board using Bluetooth Low Energy communication.
I have ...
2
votes
2
answers
6k
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[RPi3][Bluez] Managed to connect to a BLE device but can't list GATT attributes
I am doing a project where I need to create communication between two Raspberry Pi 3 on stretch (RPi) wirelessly with callback functionalities using C++ code. The first is supposed to send data to the ...
- 21
0
votes
2
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894
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Android Bluetooth Low energy Gatt Service implementation error
I used android.bluetooth package in my project but i try to implement IBluetoothGatt for read and write characteristics. But i have some problems like below
public final class BluetoothGatt ...
- 74
1
vote
1
answer
775
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Bluetooth Low Energy Notification Characteristics
I just want to figure out. If i have the BLE(cc2541) and android APP. BLE has characteristics for notification, read, write and other. Can i write value to notification characteristics from BLE, read ...
- 13