The Generic Attribute Profile (GATT) defines the way that two Bluetooth Low Energy (BTLE) devices transfer data back and forth using concepts called Services and Characteristics.
Questions tagged [bluetooth-gatt]
459 questions
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How to increase data rate via bluetooth low energy communication?
I have a bike trainer (Tacx Neo 2T) that supports bluetooth communication and I am reading some information such as speed of the bike via the bluetooth.
To read the information, I am using a python library (Bleak) and there is a GATT server with…
Meysam
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react-native-ble-manager, not getting any indications in connected device
Am using this library for connecting and communicating with a Bluetooth device such as bulb, headset.
Am able to connect to a headset and play audio on certain event like a specific socket event. Till this all is good.
But when I try to connect to a…
Vishal M
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java.lang.SecurityException: Need android.permission.BLUETOOTH_SCAN permission for android.content.AttributionSource
I have been trying to build an Android App with the capability of connecting to
a bluetooth device called ESP32 on BLE mode. I have found some posts helping me in these
regards but I also have to debug lots of stuff. I ask runtime permissions on…
SeikoFPS
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1 answer
Web bluetooth DOMException: GATT Error: Not supported
I am trying to receive data from my ESP32 via the Web Bluetooth API.
The device can connect to the webpage but after starting to listen to notifications I get the following error:
DOMException: GATT Error: Not supported
There is another thread…
BLB
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1 answer
Send Battery Level notifications to nRF Connect app when battery level reaches certain level
I am new to BLE and I need help with Battery Service notifications. I am using nrf52840dk, nrf sdk 17.1.0 and I am using ble_app_proximity example which already uses Battery Service.
I need to send a pop up notification from device to nRF Connect…
Kanthi Deep
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1 answer
How to Connect GATT Server in Xamarin iOS
In Xamarin Forms,
I want to know how the GATT server works with BLE for iOS.
Anyone can help how to connect GATT server with iOS.
Charmy
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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 of the value must contain the flags.
For example…
Nicooost
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Fatal Exception: java.lang.SecurityException Need android.permission.BLUETOOTH_CONNECT permission for android 12
fun connect(address: String?): Boolean {
if (mBluetoothAdapter == null || address == null) {
return false
}
try {
if(BluetoothAdapter.checkBluetoothAddress(address)) {
device = mBluetoothAdapter?.getRemoteDevice(address)
} else…
lakshmi
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How to only allow paired devices to connect?
I'm having a hard time understanding why a Bluetooth connection is able to be made without either pairing or trusting a device. I'm using bluetoothctl and and can connect two devices without pairing them first by using "Scan on" on the central side…
ascode
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Send first message from peripherals to centrals in android
I have successfully establish a connection and normally I can able to communicate between each other but in my case I need to send a message to the centrals when in onConnectionStateChange callback newState is…
Amit Kar
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Bluetooth notify gatt characteristic losing data
I am receiving a large amount of real-time data from a BTLE device using a notify GATT Characteristic. We're definitely reaching the bandwidth limits of the protocol, the device is capable of sending approx 1.2Mbps.
The problem: I am seeing a lot of…
Ryan_S
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1 answer
Bluetooth gatt server accept connection with some validations
I am working on a Bluetooth-based application.
GATT Server and Gatt Client, The above communication is working fine, I am not having an issue with it.
The problem is I am getting a connection from an unknown device, I want to allow connection from…
Ashvin solanki
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Bluetooth Low Energy (BLE) Bluetooth Address Randomisation
I am planning to code an application that has the capability of scanning advertising beacons around me and complete a BLE handshake with these beacons. (Basically central and peripheral functions). However, I need the device's bdaddress (Bluetooth…
im narwhal
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1 answer
ESP32 Bluetooth Pairing To Phone
I am trying to make it so that my ESP32 board can detect my phone when I approach it based on RSSI. However, the ESP32 cannot see the phone unless the phone is in discovery mode, which is not super useful. To solve this, I was hoping to pair my…
Sith Siri
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Can I sniff a BLE communication between my multimeter and my smartphone?
I am currently trying to manipulate a multimeter (Zoyi ZT-5BQ) using an Arduino board, but I don't know the protocol that uses my multimeter to change the reading mode (in example, from ohmeter to termometer).
I have tried to pair my AT-09 module to…
Alejandro Cordero
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