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docs(ble): add flow diagrams to bluedroid BLE examples

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(cherry picked from commit 051077835c)

Co-authored-by: zhanghaipeng <zhanghaipeng@espressif.com>
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Zhang Hai Peng
2026-01-05 00:03:36 +08:00
committed by BLE BOT
parent 1741046791
commit f279115113
18 changed files with 949 additions and 13 deletions
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examples/bluetooth/bluedroid/ble/gatt_security_client/README.md
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@@ -5,6 +5,59 @@
This example shows how to use the ESP BLE security APIs to secure connect to and encrypt with peer devices.
## Flow Diagram
```
┌──────────────┐ ┌──────────────┐
│ Security │ │ Security │
│ Client │ │ Server │
└──────┬───────┘ └──────┬───────┘
│ │
│ ─────────── Security Parameters Setup ───────── │
│ │
│ 1. Set IO Capability │
│ 2. Set Auth Mode (Bonding, MITM, SC) │
│ 3. Set Key Distribution │
│ │
│ ─────────── Connection Phase ─────────── │
│ │
│ 4. Scan for Server │ Advertising
│ ───────────────────────────────────────────────> │
│ │
│ 5. Connect │
│ ───────────────────────────────────────────────> │
│ │
│ Connection Established │
│ <─────────────────────────────────────────────────│
│ │
│ ─────────── Pairing & Encryption ─────────── │
│ │
│ 6. Start Encryption (esp_ble_set_encryption) │
│ ───────────────────────────────────────────────> │
│ │
│ 7. Exchange Pairing Features │
│ <────────────────────────────────────────────────>│
│ │
│ 8. Generate Keys (LTK, IRK, CSRK) │
│ <────────────────────────────────────────────────>│
│ │
│ 9. Encrypt Link │
│ <────────────────────────────────────────────────>│
│ │
│ 10. ESP_GAP_BLE_AUTH_CMPL_EVT │
│ <─────────────────────────────────────────────── │
│ │
│ ─────────── Secure Data Exchange ─────────── │
│ │
│ Encrypted GATT Operations │
│ <────────────────────────────────────────────────>│
│ │
┌──────┴───────┐ ┌──────┴───────┐
│ Security │ │ Security │
│ Client │ │ Server │
└──────────────┘ └──────────────┘
```
## How to Use Example
Before project configuration and build, be sure to set the correct chip target using: