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History

Djordje Nedic facab8c5a7 tools: Increase the minimal supported CMake version to 3.16 This updates the minimal supported version of CMake to 3.16, which in turn enables us to use more CMake features and have a cleaner build system. This is the version that provides most new features and also the one we use in our latest docker image for CI.		2022-06-01 06:35:02 +00:00
..
main	freertos: Remove legacy data types	2022-02-09 23:05:45 +08:00
blehr_test.py	ble-wifi-example-tests: Add fixes and cleanups to ble and wifi tests	2021-05-28 19:50:28 +05:30
CMakeLists.txt	tools: Increase the minimal supported CMake version to 3.16	2022-06-01 06:35:02 +00:00
README.md	docs: Rebase and typos fixed for the bluetooth README files	2021-11-16 16:56:47 +08:00
sdkconfig.ci	NimBLE: Add support to IRAM allocation strategy	2020-03-19 04:47:39 +00:00
sdkconfig.defaults	examples: fix sdkconfig warnings	2019-11-21 15:36:06 +01:00

README.md

Supported Targets	ESP32

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

Before project configuration and build, be sure to set the correct chip target using:

idf.py set-target <chip_name>

Hardware Required

A development board with ESP32/ESP32-C3 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
A USB cable for Power supply and programming

See Development Boards for more information about it.

Build and Flash

Run idf.py -p PORT flash monitor to build, flash and monitor the project.

(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

Troubleshooting

For any technical queries, please open an issue on GitHub. We will get back to you soon.