All Questions
Tagged with android-bluetooth android-ble
110
questions
0
votes
1
answer
46
views
Finding BLE Services
I'm trying to connect a smartphone running Android 13 to a server using BLE. Android 11 connects and finds services, but Android 13 can't find them. I have tried everything with permissions
I'd like ...
0
votes
1
answer
33
views
Does Android have an equivalent of iOS's Core Bluetooth canSendWriteWithoutResponse?
While implementing firmware updates, we've noticed that different Android phones seem to have different levels of reliability regarding GATT characteristic writes without response. Some will block the ...
- 1,798
0
votes
0
answers
45
views
Uncaught exception thrown by finalizer for Bluetooth Reconnection in Android - java.io.IOException: socket not created
I am trying to work with a Serial Bluetooth connection where I am connecting and communicating to the IOT device serially over Bluetooth. So the device has On/Off switch which can basically close the ...
1
vote
1
answer
444
views
Why is onCharacteristicChanged never called when it should be?
I'm working with Bluetooth (BLE) in an Android app.
There is a characteristic that should be triggering callbacks to onCharacteristicChanged, but the callbacks never happen. Other functions of the ...
- 1,639
0
votes
0
answers
61
views
How to check if a BLE device is currently busy?
I need to check if the device is writing a firmware chunk. If yes, then do not start recording the next chunk. I tried to do it with continuations but it didn't work.
Can a reliable write help me in ...
- 24
1
vote
2
answers
2k
views
writeDescriptor(BluetoothGattDescriptor!): Boolean' is deprecated. Deprecated in Java
I am working Bluetooth gatt with
minSdk 21
targetSdk 33
I see the writeDescriptor is deprecated in sdk 33. So I did this to wrap the code in SDK version check
gatt.setCharacteristicNotification(...
- 6,129
1
vote
1
answer
374
views
onPhyUpdate is triggered with status 6 = GATT_REQUEST_NOT_SUPPORTED
I'm developing an Android app which communicates via BLE with an external module, and I am trying to set the BLE connection PHY.
I've tried calling the method gatt.setPreferredPhy(txPhy, rxPhy, ...
- 125
5
votes
2
answers
989
views
Android Bluetooth (BLE) corrupted data on onCharacteristicChanged
My app do the following:
It sends a command with onDescriptorWrite to the BT device.
As soon the BT device gets this command it starts transferring data to the Android phone.
Android's ...
- 10.3k
6
votes
6
answers
2k
views
Android BLE onScanResult is never called in the background on Android 11. Was working on Android 10
I have an app which scans for BLE devices. It was working perfectly on Android 10, but since I updated my phone to Android 11, the onScanResult just never gets called if I put the application to the ...
- 10.3k
0
votes
1
answer
632
views
Handling Notifications on Android with Multiple BLE Peripheral Connections
So, I am new to Android development and I am trying to connect my device to multiple BLE devices (T-Wristband) to receive frequent notifications (IMU sensor data less than 20 bytes at 50Hz).
When ...
0
votes
1
answer
758
views
BLE packet drops when Bluetooth and BLE are simultaneously in use
I am using BLE v4.1 for my application where I am able to transfer 200 packets of length 20 bytes each from peripheral to central side.
I want to transfer data via BLE and play some music while the ...
- 93
2
votes
2
answers
613
views
Companion device pairing: how to filter using UUID?
I am using Companion device pairing and followed this guide.
I want to scan for devices and filter them using UUID. I tried the following
val deviceFilter: BluetoothLeDeviceFilter = ...
- 1,411
2
votes
1
answer
522
views
Companion device pairing: how long does it take the scan to stop?
I am using Companion device pairing and followed this guide.
when I try to associate to a device like that deviceManager.associate(pairingRequest,callbacks) it will start scanning for BLE devices.
1....
- 1,411
0
votes
1
answer
1k
views
How to implement a custom UUID for bluetooth broadcast
I want to change my android device's Bluetooth UUID to a predefined value so that my BLE beacon can recognize it without pairing with it.
From this question I gathered that I'll have to change the ...
- 45
1
vote
1
answer
563
views
Why Android BLE gatt callback method onCharacteristicChanged callback is called in lower rate in Wear OS device than on smartphone?
I develop an application designed for Wear OS devices that received data using BLE as Gatt client. I set the mtu size the maximum possible (517 bytes), and need to transfer some large amount of data - ...
- 445