113 lines
4 KiB
Markdown
113 lines
4 KiB
Markdown
# BLE Heart Rate Measurement example
|
|
|
|
(See the README.md file in the upper level 'examples' directory for more information about examples.)
|
|
|
|
This example creates GATT server demonstrating standard Heart Rate measurement service. It simulates Hear rate measurement and notifies to client when the notifications are enabled.
|
|
|
|
It uses ESP32's Bluetooth controller and NimBLE stack based BLE host
|
|
|
|
This example aims at understanding notification subscriptions and sending notifications.
|
|
|
|
To test this demo, any BLE scanner app can be used.
|
|
|
|
A Python based utility `blehr_test.py` is also provided (which will run as a BLE GATT Client) and can be used to test this example.
|
|
|
|
Note :
|
|
|
|
* Make sure to run `python -m pip install --user -r $IDF_PATH/requirements.txt -r $IDF_PATH/tools/ble/requirements.txt` to install the dependency packages needed.
|
|
* Currently this Python utility is only supported on Linux (BLE communication is via BLuez + DBus).
|
|
|
|
|
|
## How to use example
|
|
|
|
### Configure the project
|
|
|
|
```
|
|
idf.py menuconfig
|
|
```
|
|
|
|
### Build and Flash
|
|
|
|
Build the project and flash it to the board, then run monitor tool to view serial output:
|
|
|
|
```
|
|
idf.py -p PORT flash monitor
|
|
```
|
|
|
|
(To exit the serial monitor, type ``Ctrl-]``.)
|
|
|
|
See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
|
|
|
|
## Example Output
|
|
|
|
This console output can be observed when blehr is connected to client and client enables notifications:
|
|
|
|
```
|
|
I (91) BTDM_INIT: BT controller compile version [fe7ced0]
|
|
I (91) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
|
|
I (181) phy: phy_version: 4100, 6fa5e27, Jan 25 2019, 17:02:06, 0, 0
|
|
I (421) NimBLE_BLE_HeartRate: BLE Host Task Started
|
|
GAP procedure initiated: stop advertising.
|
|
Device Address: xx:xx:xx:xx:xx:xx
|
|
GAP procedure initiated: advertise; disc_mode=2 adv_channel_map=0 own_addr_type=0 adv_filter_policy=0 adv_itvl_min=0 adv_itvl_max=0
|
|
connection established; status=0
|
|
subscribe event; cur_notify=1
|
|
value handle; val_handle=3
|
|
I (21611) BLE_GAP_SUBSCRIBE_EVENT: conn_handle from subscribe=0
|
|
GATT procedure initiated: notify; att_handle=3
|
|
GATT procedure initiated: notify; att_handle=3
|
|
GATT procedure initiated: notify; att_handle=3
|
|
GATT procedure initiated: notify; att_handle=3
|
|
GATT procedure initiated: notify; att_handle=3
|
|
GATT procedure initiated: notify; att_handle=3
|
|
GATT procedure initiated: notify; att_handle=3
|
|
|
|
```
|
|
|
|
## Running Python Utility
|
|
|
|
```
|
|
python blehr_test.py
|
|
```
|
|
|
|
## Python Utility Output
|
|
|
|
This is this output seen on the python side on successful connection:
|
|
|
|
```
|
|
discovering adapter...
|
|
bluetooth adapter discovered
|
|
powering on adapter...
|
|
bluetooth adapter powered on
|
|
|
|
Started Discovery
|
|
|
|
Connecting to device...
|
|
|
|
Connected to device
|
|
|
|
Services
|
|
|
|
[dbus.String(u'00001801-0000-1000-8000-00805f9b34fb', variant_level=1), dbus.String(u'0000180d-0000-1000-8000-00805f9b34fb', variant_level=1), dbus.String(u'0000180a-0000-1000-8000-00805f9b34fb', variant_level=1)]
|
|
|
|
Subscribe to notifications: On
|
|
dbus.Array([dbus.Byte(6), dbus.Byte(90)], signature=dbus.Signature('y'), variant_level=1)
|
|
dbus.Array([dbus.Byte(6), dbus.Byte(91)], signature=dbus.Signature('y'), variant_level=1)
|
|
dbus.Array([dbus.Byte(6), dbus.Byte(92)], signature=dbus.Signature('y'), variant_level=1)
|
|
dbus.Array([dbus.Byte(6), dbus.Byte(93)], signature=dbus.Signature('y'), variant_level=1)
|
|
dbus.Array([dbus.Byte(6), dbus.Byte(94)], signature=dbus.Signature('y'), variant_level=1)
|
|
dbus.Array([dbus.Byte(6), dbus.Byte(95)], signature=dbus.Signature('y'), variant_level=1)
|
|
dbus.Array([dbus.Byte(6), dbus.Byte(96)], signature=dbus.Signature('y'), variant_level=1)
|
|
dbus.Array([dbus.Byte(6), dbus.Byte(97)], signature=dbus.Signature('y'), variant_level=1)
|
|
dbus.Array([dbus.Byte(6), dbus.Byte(98)], signature=dbus.Signature('y'), variant_level=1)
|
|
dbus.Array([dbus.Byte(6), dbus.Byte(99)], signature=dbus.Signature('y'), variant_level=1)
|
|
|
|
Subscribe to notifications: Off
|
|
Success: blehr example test passed
|
|
|
|
exiting from test...
|
|
disconnecting device...
|
|
device disconnected
|
|
powering off adapter...
|
|
bluetooth adapter powered off
|
|
```
|