# Verify GATT functions GATT is a service framework that uses ATT to discover services, and to read and write characteristic values on a peer device. To perform Bluetooth Low Energy GATT server or client functions, you must first complete the steps in the following procedure. ## Prerequisites - Enable SSH to access your host device. For instructions, see [Sign in using SSH](https://docs.qualcomm.com/bundle/publicresource/topics/80-80022-254/how_to.html#use-ssh). - Place the DUT and the remote device in the Bluetooth vicinity. ## Set up the device for Bluetooth Low Energy GATT functions 1. Run the SSH in command prompt using the following command: ssh root@ Copy to clipboard **Example** If the IP address of the device is `10.92.160.222`, run the following command: ssh root@10.92.160.222 Copy to clipboard 2. Connect to the SSH by entering the following password: oelinux123 Copy to clipboard 3. Open the Bluetooth test application by running the following command: bluetoothctl Copy to clipboard You can perform a few GATT functions like connecting and scanning through the main menu options of bluetoothctl. **Sample output** sh-5.1# bluetoothctl Agent registered uetoothd... [CHG] Controller 22:22:F1:C1:99:C0 Pairable: yes Copy to clipboard 4. Enable Bluetooth by running the following command: power on Copy to clipboard **Sample output** [bluetooth]# power on [CHG] Controller 22:22:F1:C1:99:C0 Class: 0x007c0000 Changing power on succeeded [CHG] Controller 22:22:F1:C1:99:C0 Powered: yes Copy to clipboard 5. Go to the **GATT submenu** by running the following command: menu gatt Copy to clipboard **Sample output** [bluetooth]# menu gatt Menu gatt: Available commands: ------------------- list-attributes [dev/local] List attributes select-attribute [attribute/UUID] Select attribute attribute-info [attribute/UUID] Select attribute read [offset] Read attribute value write [offset] [type] Write attribute value acquire-write Acquire Write file descriptor release-write Release Write file descriptor acquire-notify Acquire Notify file descriptor release-notify Release Notify file descriptor notify Notify attribute value clone [dev/attribute/UUID] Clone a device or attribute register-application [UUID ...] Register profile to connect unregister-application Unregister profile register-service [handle] Register application service. unregister-service Unregister application service register-includes [handle] Register as Included service in. unregister-includes Unregister Included service. register-characteristic [handle] Register application characteristic unregister-characteristic Unregister application characteristic register-descriptor [handle] Register application descriptor unregister-descriptor Unregister application descriptor back Return to main menu version Display version quit Quit program exit Quit program help Display help about this program export Print environment variables Copy to clipboard - For GATT server functions, see [Perform Bluetooth Low Energy GATT server functions](https://docs.qualcomm.com/doc/80-80022-13/topic/bluez-perform-bluetooth-low-energy-gatt-server-functions.html#bluez-perform-bluetooth-low-energy-gatt-server-functions). - For GATT client functions, see [Perform Bluetooth Low Energy GATT client functions](https://docs.qualcomm.com/doc/80-80022-13/topic/bluez-perform-bluetooth-low-energy-gatt-client-functions.html#bluez-perform-bluetooth-low-energy-gatt-client-functions). ## Next steps - [Perform Bluetooth Low Energy GATT server functions](https://docs.qualcomm.com/doc/80-80022-13/topic/bluez-perform-bluetooth-low-energy-gatt-server-functions.html) You can perform Bluetooth Low Energy GATT server functions using the **GATT submenu** options and `bluetoothctl` commands. Bluetooth Low Energy GATT server functions include connecting to and disconnecting from remote devices, adding a primary service, and defining characteristics and descriptors. GATT functions also support adding included services, registering an application, and starting advertisements to make the device discoverable. - [Perform Bluetooth Low Energy GATT client functions](https://docs.qualcomm.com/doc/80-80022-13/topic/bluez-perform-bluetooth-low-energy-gatt-client-functions.html) You can perform Bluetooth Low Energy GATT client functions using the **GATT submenu** options and `bluetoothctl` commands. Bluetooth Low Energy GATT client functions include connecting to a remote device and starting or stopping Bluetooth Low Energy GATT scans. You can retrieve the list of attributes, get attribute information, and select specific attributes. GATT functions also support reading and writing characteristic values, including encrypted characteristics, and reading and writing descriptor values. Additionally, they allow turning notifications on or off for selected attributes. Last Published: May 10, 2026 [Previous Topic Perform Bluetooth GAP functions](https://docs.qualcomm.com/bundle/publicresource/80-80022-13/topics/bluez-perform-bluetooth-gap-functions.md) [Next Topic Perform Bluetooth Low Energy GATT server functions](https://docs.qualcomm.com/bundle/publicresource/80-80022-13/topics/bluez-perform-bluetooth-low-energy-gatt-server-functions.md)