feat(ble): Added ble examples for multiple connections

components/bt/controller/esp32c6/Kconfig.in

@@ -340,7 +340,7 @@ config BT_LE_LL_SCA
 config BT_LE_MAX_CONNECTIONS
     int "Maximum number of concurrent connections"
     depends on !BT_NIMBLE_ENABLED
-    range 1 9
+    range 1 70
     default 3
     help
         Defines maximum number of concurrent BLE connections. For ESP32, user

components/bt/controller/esp32h2/Kconfig.in

@@ -340,7 +340,7 @@ config BT_LE_LL_SCA
 config BT_LE_MAX_CONNECTIONS
     int "Maximum number of concurrent connections"
     depends on !BT_NIMBLE_ENABLED
-    range 1 9
+    range 1 35
     default 3
     help
         Defines maximum number of concurrent BLE connections. For ESP32, user

components/bt/host/nimble/Kconfig.in

@@ -65,6 +65,8 @@ config BT_NIMBLE_LOG_LEVEL
 config BT_NIMBLE_MAX_CONNECTIONS
     int "Maximum number of concurrent connections"
     range 1 2 if IDF_TARGET_ESP32C2
+    range 1 70 if IDF_TARGET_ESP32C6
+    range 1 35 if IDF_TARGET_ESP32H2
     range 1 9
     default 2 if IDF_TARGET_ESP32C2
     default 3
@@ -825,3 +827,13 @@ config BT_NIMBLE_VS_SUPPORT
     help
         This option is used to enable support for sending Vendor Specific HCI commands and handling
         Vendor Specific HCI Events.
+
+config BT_NIMBLE_OPTIMIZE_MULTI_CONN
+    bool "Enable the optimization of multi-connection"
+    depends on SOC_BLE_MULTI_CONN_OPTIMIZATION
+    select BT_NIMBLE_VS_SUPPORT
+    default n
+    help
+        This option enables the use of vendor-specific APIs for multi-connections, which can
+        greatly enhance the stability of coexistence between numerous central and peripheral
+        devices. It will prohibit the usage of standard APIs.

components/bt/host/nimble/port/include/esp_nimble_cfg.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -1707,4 +1707,12 @@
 #define MYNEWT_VAL_BLE_HCI_VS    (0)
 #endif
 
+#ifndef MYNEWT_VAL_OPTIMIZE_MULTI_CONN
+#ifdef CONFIG_BT_NIMBLE_OPTIMIZE_MULTI_CONN
+#define MYNEWT_VAL_OPTIMIZE_MULTI_CONN  CONFIG_BT_NIMBLE_OPTIMIZE_MULTI_CONN
+#else
+#define MYNEWT_VAL_OPTIMIZE_MULTI_CONN (0)
+#endif
+#endif
+
 #endif

components/soc/esp32c6/include/soc/Kconfig.soc_caps.in

@@ -1311,6 +1311,10 @@ config SOC_BLUFI_SUPPORTED
     bool
     default y
 
+config SOC_BLE_MULTI_CONN_OPTIMIZATION
+    bool
+    default y
+
 config SOC_BLE_USE_WIFI_PWR_CLK_WORKAROUND
     bool
     default y

components/soc/esp32c6/include/soc/soc_caps.h

@@ -532,5 +532,6 @@
 #define SOC_BLE_DEVICE_PRIVACY_SUPPORTED (1)   /*!< Support BLE device privacy mode */
 #define SOC_BLE_POWER_CONTROL_SUPPORTED (1)    /*!< Support Bluetooth Power Control */
 #define SOC_BLUFI_SUPPORTED             (1)    /*!< Support BLUFI */
+#define SOC_BLE_MULTI_CONN_OPTIMIZATION (1)    /*!< Support multiple connections optimization */
 
 #define SOC_BLE_USE_WIFI_PWR_CLK_WORKAROUND (1)

components/soc/esp32h2/include/soc/Kconfig.soc_caps.in

@@ -1214,3 +1214,7 @@ config SOC_BLE_DEVICE_PRIVACY_SUPPORTED
 config SOC_BLE_POWER_CONTROL_SUPPORTED
     bool
     default y
+
+config SOC_BLE_MULTI_CONN_OPTIMIZATION
+    bool
+    default y

components/soc/esp32h2/include/soc/soc_caps.h

@@ -500,3 +500,4 @@
 #define SOC_BLE_50_SUPPORTED            (1)    /*!< Support Bluetooth 5.0 */
 #define SOC_BLE_DEVICE_PRIVACY_SUPPORTED (1)   /*!< Support BLE device privacy mode */
 #define SOC_BLE_POWER_CONTROL_SUPPORTED (1)    /*!< Support Bluetooth Power Control */
+#define SOC_BLE_MULTI_CONN_OPTIMIZATION (1)    /*!< Support multiple connections optimization */

examples/bluetooth/.build-test-rules.yml

@@ -168,6 +168,16 @@ examples/bluetooth/nimble/ble_multi_adv:
       temporary: true
       reason: The runner doesn't support yet
 
+examples/bluetooth/nimble/ble_multi_conn:
+  enable:
+    - if: IDF_TARGET in ["esp32c6", "esp32h2"]
+      temporary: true
+      reason: the other targets are not tested yet
+  disable_test:
+    - if: IDF_TARGET in ["esp32c6", "esp32h2"]
+      temporary: true
+      reason: The runner doesn't support yet
+
 examples/bluetooth/nimble/ble_periodic_adv:
   enable:
     - if: IDF_TARGET in ["esp32c2", "esp32c3", "esp32c6" , "esp32s3", "esp32h2" ]

examples/bluetooth/nimble/ble_multi_conn/ble_multi_conn_cent/CMakeLists.txt

@@ -0,0 +1,8 @@
+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+
+set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/bluetooth/nimble/common/nimble_central_utils)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(blecent)

examples/bluetooth/nimble/ble_multi_conn/ble_multi_conn_cent/README.md

@@ -0,0 +1,76 @@
+| Supported Targets | ESP32-C6 | ESP32-H2 |
+| ----------------- | -------- | -------- |
+
+# BLE Multiple Connection Central Example
+
+(See the README.md file in the upper level 'examples' directory for more information about examples.)
+
+Please check the [tutorial](tutorial/Ble_Multiple_Connections_Central_Example_Walkthrough.md) for more information about this example.
+
+## How to Use Example
+
+Before project configuration and build, be sure to set the correct chip target using:
+
+```bash
+idf.py set-target <chip_name>
+```
+
+### Hardware Required
+
+* At least two development board with ESP32-C6/ESP32-H2 SoC (e.g., ESP32-C6-DevKitC, ESP32-H2-DevKitC, etc.)
+* USB cable for Power supply and programming
+
+See [Development Boards](https://www.espressif.com/en/products/devkits) 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](https://idf.espressif.com/) for full steps to configure and use ESP-IDF to build projects.
+
+## Example Output
+
+This is the console output on successful connection:
+
+```
+controller lib commit: [5cacafa]
+I (564) ESP_MULTI_CONN_EXT: BLE Host Task Started
+I (564) main_task: Returned from app_main()
+I (604) ESP_MULTI_CONN_EXT: Create connection. -> peer addr e0:e1:f5:6f:ec:9d
+I (1234) ESP_MULTI_CONN_EXT: Connection established. Handle:1, Total:1
+I (2754) ESP_MULTI_CONN_EXT: Create connection. -> peer addr ee:16:69:80:72:d5
+I (3394) ESP_MULTI_CONN_EXT: Connection established. Handle:2, Total:2
+I (4454) ESP_MULTI_CONN_EXT: Create connection. -> peer addr ef:1a:6e:d6:64:44
+I (5094) ESP_MULTI_CONN_EXT: Connection established. Handle:3, Total:3
+I (6144) ESP_MULTI_CONN_EXT: Create connection. -> peer addr cb:f4:5d:b2:c8:1d
+I (6244) ESP_MULTI_CONN_EXT: Connection established. Handle:4, Total:4
+I (6444) ESP_MULTI_CONN_EXT: Create connection. -> peer addr e8:08:e5:ad:61:f6
+I (7394) ESP_MULTI_CONN_EXT: Connection established. Handle:5, Total:5
+I (8504) ESP_MULTI_CONN_EXT: Create connection. -> peer addr c1:53:a8:6f:2a:b4
+I (9124) ESP_MULTI_CONN_EXT: Connection established. Handle:6, Total:6
+I (9274) ESP_MULTI_CONN_EXT: Create connection. -> peer addr dd:fb:5b:13:6a:20
+I (9904) ESP_MULTI_CONN_EXT: Connection established. Handle:7, Total:7
+I (10934) ESP_MULTI_CONN_EXT: Create connection. -> peer addr d5:71:9c:fe:4f:6e
+I (11574) ESP_MULTI_CONN_EXT: Connection established. Handle:8, Total:8
+I (12264) ESP_MULTI_CONN_EXT: Create connection. -> peer addr d9:56:91:21:d4:25
+I (12884) ESP_MULTI_CONN_EXT: Connection established. Handle:9, Total:9
+I (13084) ESP_MULTI_CONN_EXT: Create connection. -> peer addr f7:f9:b1:73:38:13
+I (13704) ESP_MULTI_CONN_EXT: Connection established. Handle:10, Total:10
+I (14724) ESP_MULTI_CONN_EXT: Create connection. -> peer addr e7:e5:94:d0:32:78
+I (15354) ESP_MULTI_CONN_EXT: Connection established. Handle:11, Total:11
+I (16404) ESP_MULTI_CONN_EXT: Create connection. -> peer addr fb:c6:f9:46:11:dc
+I (17344) ESP_MULTI_CONN_EXT: Connection established. Handle:12, Total:12
+I (18434) ESP_MULTI_CONN_EXT: Create connection. -> peer addr c0:e3:ef:80:e6:fd
+I (19374) ESP_MULTI_CONN_EXT: Connection established. Handle:13, Total:13
+I (20484) ESP_MULTI_CONN_EXT: Create connection. -> peer addr d8:9d:6d:b8:c9:40
+I (21104) ESP_MULTI_CONN_EXT: Connection established. Handle:14, Total:14
+I (30814) ESP_MULTI_CONN_EXT: Connected to central. Handle:15
+I (39624) BLE_CENT_SVC: Characteristic write; conn_handle=15
+I (39624) BLE_CENT_SVC: 12
+```
+
+## Troubleshooting
+
+For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.

examples/bluetooth/nimble/ble_multi_conn/ble_multi_conn_cent/main/CMakeLists.txt

@@ -0,0 +1,5 @@
+set(srcs "main.c"
+         "gatt_svr.c")
+
+idf_component_register(SRCS "${srcs}"
+                       INCLUDE_DIRS ".")

examples/bluetooth/nimble/ble_multi_conn/ble_multi_conn_cent/main/Kconfig.projbuild

@@ -0,0 +1,4 @@
+menu "Example Configuration"
+
+
+endmenu

examples/bluetooth/nimble/ble_multi_conn/ble_multi_conn_cent/main/ble_multi_conn_cent.h

@@ -0,0 +1,20 @@
+/*
+ * SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef H_BLECENT_
+#define H_BLECENT_
+
+#include "esp_central.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int gatt_svr_init(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif