Linux BLE: Difference between revisions
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{{PageHeader|Bluetooth Low Energy}} {{DocImage|category1=Yocto|category2=VAR-SOM-MX6 | {{PageHeader|Bluetooth Low Energy}} | ||
{{note| | {{DocImage|category1=Yocto|category2=Debian}}[[Category:VAR-SOM-MX6]][[Category: DART-6UL]][[Category: VAR-SOM-MX7]][[Category:DART-MX8M]][[Category:DART-MX8M-MINI]][[Category:DART-MX8M-PLUS]] __toc__ | ||
<br>{{note| Please make sure your Bluetooth device is powered on and ready for use. Follow the [[IMX Bluetooth#Device_identification|Bluetooth wiki]] page if required. | |||
|info}} | |info}} | ||
= Simulating BLE devices = | |||
The BLE peripheral can be simulated installing and running the following Android App:<br> | |||
https://play.google.com/store/apps/details?id=io.github.webbluetoothcg.bletestperipheral&hl=en_US&gl=US<br> | |||
The BLE Peripheral Simulator is an Android app that allows developers to try out new features<br> | |||
of Web Bluetooth without the need for a BLE Peripheral Device.<br> | |||
You can check the code at: https://github.com/WebBluetoothCG/ble-test-peripheral-android<br> | |||
[[File:BLE_Peripheral_Simulator.jpeg|200px]] | |||
= Finding BLE devices = | = Finding BLE devices = | ||
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<pre> | <pre> | ||
# btmgmt find -l | |||
Discovery started | Discovery started | ||
hci0 type 7 discovering on | hci0 type 7 discovering on | ||
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= Connecting to BLE devices = | = Connecting to BLE devices = | ||
Use '''gatttool''' to connect to BLE devices. Pass "-t random" parameter if scan has reported a random MAC address. | Use '''gatttool''' to connect to BLE devices. Pass "-t random" parameter if scan has reported a random MAC address. | ||
<pre> | <pre> | ||
# gatttool -t random -b 74:B9:AB:CF:13:A9 -I | |||
[74:B9:AB:CF:13:A9][LE]> connect | [74:B9:AB:CF:13:A9][LE]> connect | ||
Attempting to connect to 74:B9:AB:CF:13:A9 | Attempting to connect to 74:B9:AB:CF:13:A9 | ||
[74:B9:AB:CF:13:A9][LE]> | [74:B9:AB:CF:13:A9][LE]> | ||
Connection successful | Connection successful | ||
Indication handle = 0x0003 value: 01 00 ff ff | Indication handle = 0x0003 value: 01 00 ff ff | ||
[74:B9:AB:CF:13:A9][LE]> | [74:B9:AB:CF:13:A9][LE]> | ||
</pre> | </pre> | ||
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= Receiving notifications from BLE devices = | = Receiving notifications from BLE devices = | ||
Notifications sent from connected BLE devices can be seen in '''gatttool'''. The example below shows notification sent by Android "BLE Peripheral Simulator" | Notifications sent from connected BLE devices can be seen in '''gatttool'''. The example below shows heart rate notification sent by Android "BLE Peripheral Simulator"<br> | ||
[[File:BLE_Peripheral_HRS.jpeg|200px]] | |||
<pre> | <pre> | ||
[74:B9:AB:CF:13:A9][LE]> | [74:B9:AB:CF:13:A9][LE]> | ||
Latest revision as of 16:41, 15 March 2023
Bluetooth Low Energy
Please make sure your Bluetooth device is powered on and ready for use. Follow the Bluetooth wiki page if required.
Simulating BLE devices
The BLE peripheral can be simulated installing and running the following Android App:
https://play.google.com/store/apps/details?id=io.github.webbluetoothcg.bletestperipheral&hl=en_US&gl=US
The BLE Peripheral Simulator is an Android app that allows developers to try out new features
of Web Bluetooth without the need for a BLE Peripheral Device.
You can check the code at: https://github.com/WebBluetoothCG/ble-test-peripheral-android
Finding BLE devices
Use btmgmt tool to find BLE devices and detect their MAC address type (random vs public).
# btmgmt find -l Discovery started hci0 type 7 discovering on hci0 dev_found: 74:B9:AB:CF:13:A9 type LE Random rssi -90 flags 0x0000 AD flags 0x1a name Galaxy S5 hci0 type 7 discovering off
In this example a single BLE device was detected, having MAC address 74:B9:AB:CF:13:A9 and random MAC address type
Connecting to BLE devices
Use gatttool to connect to BLE devices. Pass "-t random" parameter if scan has reported a random MAC address.
# gatttool -t random -b 74:B9:AB:CF:13:A9 -I [74:B9:AB:CF:13:A9][LE]> connect Attempting to connect to 74:B9:AB:CF:13:A9 [74:B9:AB:CF:13:A9][LE]> Connection successful Indication handle = 0x0003 value: 01 00 ff ff [74:B9:AB:CF:13:A9][LE]>
Accessing BLE devices
After successful connection BLE device characteristics can be accessed via gatttool. Continuing the example above:
[74:B9:AB:CF:13:A9][LE]> characteristics handle: 0x0002, char properties: 0x20, char value handle: 0x0003, uuid: 00002a05-0000-1000-8000-00805f9b34fb handle: 0x0015, char properties: 0x02, char value handle: 0x0016, uuid: 00002a00-0000-1000-8000-00805f9b34fb handle: 0x0017, char properties: 0x02, char value handle: 0x0018, uuid: 00002a01-0000-1000-8000-00805f9b34fb handle: 0x0019, char properties: 0x02, char value handle: 0x001a, uuid: 00002aa6-0000-1000-8000-00805f9b34fb handle: 0x0029, char properties: 0x12, char value handle: 0x002a, uuid: 00002a19-0000-1000-8000-00805f9b34fb [74:B9:AB:CF:13:A9][LE]> char-read-hnd 0x0002 Characteristic value/descriptor: 20 03 00 05 2a [74:B9:AB:CF:13:A9][LE]> char-read-hnd 0x0015 Characteristic value/descriptor: 02 16 00 00 2a [74:B9:AB:CF:13:A9][LE]> char-read-hnd 0x0017 Characteristic value/descriptor: 02 18 00 01 2a [74:B9:AB:CF:13:A9][LE]> char-read-hnd 0x0019 Characteristic value/descriptor: 02 1a 00 a6 2a [74:B9:AB:CF:13:A9][LE]> char-read-hnd 0x0029 Characteristic value/descriptor: 12 2a 00 19 2a
Receiving notifications from BLE devices
Notifications sent from connected BLE devices can be seen in gatttool. The example below shows heart rate notification sent by Android "BLE Peripheral Simulator"
[74:B9:AB:CF:13:A9][LE]> Notification handle = 0x002a value: 08 3c 00 00 [74:B9:AB:CF:13:A9][LE]>