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85 lines
2.9 KiB
Markdown
85 lines
2.9 KiB
Markdown
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| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-S3 |
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| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- |
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# BLE Heart Rate Measurement Example
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This example creates GATT server demonstrating standard Health Thermometer profile. It simulates temperature measurement and notifies to client when the notifications are enabled.
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It advertises support for the Health Thermometer service (0x1809) as primary service UUID.
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When internmediate temperature characteristic is subscribed, the timer resets and it sends notifications to client every 1 sec.
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It uses ESP32's Bluetooth controller and NimBLE stack based BLE host
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This example aims at understanding notification subscriptions and sending notifications.
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## How to Use Example
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Before project configuration and build, be sure to set the correct chip target using:
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```bash
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idf.py set-target <chip_name>
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```
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### Hardware Required
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* A development board with ESP32/ESP32-C3 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
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* A USB cable for Power supply and programming
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See [Development Boards](https://www.espressif.com/en/products/devkits) for more information about it.
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### Build and Flash
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Run `idf.py -p PORT flash monitor` to build, flash and monitor the project.
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the [Getting Started Guide](https://idf.espressif.com/) for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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This console output can be observed when blehr is connected to client and client enables notifications:
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```
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I (356) BLE_INIT: BT controller compile version [921f253]
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I (356) phy_init: phy_version 950,f732b06,Feb 15 2023,18:57:12
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I (396) BLE_INIT: Bluetooth MAC: 70:04:1d:13:66:fe
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I (396) NimBLE_BLE_Health_Therm: BLE Host Task Started
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I (396) NimBLE: GAP procedure initiated: stop advertising.
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I (406) NimBLE: Failed to restore IRKs from store; status=8
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I (406) NimBLE: Device Address:
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I (416) NimBLE: 70:04:1d:13:66:fe
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I (416) NimBLE:
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I (416) NimBLE: GAP procedure initiated: advertise;
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I (426) NimBLE: disc_mode=2
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I (426) NimBLE: adv_channel_map=0 own_addr_type=0 adv_filter_policy=0 adv_itvl_min=0 adv_itvl_max=0
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I (436) NimBLE:
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I (446) main_task: Returned from app_main()
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I (6116) NimBLE: connection established; status=0
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I (7946) NimBLE: subscribe event; cur_notify=0
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value handle; val_handle=12
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I (7956) BLE_GAP_SUBSCRIBE_EVENT: conn_handle from subscribe=1
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I (8046) NimBLE: subscribe event; cur_notify=1
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value handle; val_handle=17
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I (8056) BLE_GAP_SUBSCRIBE_EVENT: conn_handle from subscribe=1
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I (9056) NimBLE: GATT procedure initiated: notify;
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I (9056) NimBLE: att_handle=17
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```
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## Troubleshooting
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For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.
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