feat(openthread): support multipan feature for RCP

components/openthread/private_include/esp_openthread_common_macro.h

@@ -42,3 +42,9 @@
 #else
 #define ESP_OPENTHREAD_ASSERT(a) assert(a)
 #endif
+
+#if CONFIG_OPENTHREAD_MULTIPAN_RCP_ENABLE
+#define OT_INSTANCE_COUNT CONFIG_OPENTHREAD_MULTIPLE_INTERFACES_COUNT
+#else
+#define OT_INSTANCE_COUNT 1
+#endif

components/openthread/private_include/esp_openthread_ncp.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2024-2026 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -10,8 +10,21 @@
 extern "C" {
 #endif
 
+/**
+ * @brief This function initializes the NCP for a single instance
+ *
+ * @param[in]    aInstance   The OpenThread instance.
+ */
 void otAppNcpInit(otInstance *aInstance);
 
+/**
+ * @brief This function initializes the NCP for multiple instances
+ *
+ * @param[in]    aInstances   The array of OpenThread instances.
+ * @param[in]    aCount       The number of instances.
+ */
+void otAppNcpInitMulti(otInstance **aInstances, uint8_t aCount);
+
 #if CONFIG_OPENTHREAD_RCP_SPINEL_CONSOLE
 esp_err_t esp_console_redirect_to_otlog(void);
 #endif // CONFIG_OPENTHREAD_RCP_SPINEL_CONSOLE

components/openthread/private_include/esp_openthread_platform.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021-2025 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2026 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -155,6 +155,37 @@ void esp_openthread_set_storage_name(const char *name);
  */
 uint32_t esp_openthread_get_alloc_caps(void);
 
+/**
+ * @brief This function gets the index of the instance
+ *
+ * @param[in]    instance   The OpenThread instance.
+ *
+ * @note Invalid input is logged and asserted.
+ *
+ * @return
+ *      - The index of the instance
+ */
+int8_t esp_openthread_get_idx_from_instance(otInstance *instance);
+
+/**
+ * @brief This function gets the instance from the index
+ *
+ * @param[in]    idx   The index of the instance.
+ *
+ * @note Invalid index is logged and asserted. A valid index always has an instance.
+ *
+ * @return
+ *      - The instance
+ */
+otInstance *esp_openthread_get_instance_from_idx(int8_t idx);
+
+/**
+ * @brief This function sets the active instance
+ *
+ * @param[in]    instance   The OpenThread instance.
+ */
+void esp_openthread_set_active_instance(otInstance *instance);
+
 #ifdef __cplusplus
 } // end of extern "C"
 #endif

components/openthread/private_include/openthread-core-esp32x-radio-config.h

@@ -165,6 +165,62 @@
 #define OPENTHREAD_CONFIG_TIME_SYNC_ENABLE 0
 #endif
 
+/**
+ * @def OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+ *
+ * Define to 1 to enable multiple instance support.
+ */
+#ifdef OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+#error `OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE` is redefined.
+#endif
+#if CONFIG_OPENTHREAD_MULTIPAN_RCP_ENABLE
+#define OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE 1
+#else
+#define OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE 0
+#endif
+
+/**
+ * @def OPENTHREAD_CONFIG_MULTIPAN_RCP_ENABLE
+ *
+ * Define to 1 to enable multipan RCP support.
+ */
+#ifdef OPENTHREAD_CONFIG_MULTIPAN_RCP_ENABLE
+#error `OPENTHREAD_CONFIG_MULTIPAN_RCP_ENABLE` is redefined.
+#endif
+#if CONFIG_OPENTHREAD_MULTIPAN_RCP_ENABLE
+#define OPENTHREAD_CONFIG_MULTIPAN_RCP_ENABLE 1
+#else
+#define OPENTHREAD_CONFIG_MULTIPAN_RCP_ENABLE 0
+#endif
+
+/**
+ * @def OPENTHREAD_CONFIG_MULTIPLE_STATIC_INSTANCE_ENABLE
+ *
+ * Define to 1 to enable multiple static instance support.
+ */
+#ifdef OPENTHREAD_CONFIG_MULTIPLE_STATIC_INSTANCE_ENABLE
+#error `OPENTHREAD_CONFIG_MULTIPLE_STATIC_INSTANCE_ENABLE` is redefined.
+#endif
+#if CONFIG_OPENTHREAD_MULTIPAN_RCP_ENABLE
+#define OPENTHREAD_CONFIG_MULTIPLE_STATIC_INSTANCE_ENABLE 1
+#else
+#define OPENTHREAD_CONFIG_MULTIPLE_STATIC_INSTANCE_ENABLE 0
+#endif
+
+/**
+ * @def OPENTHREAD_SPINEL_CONFIG_BROADCAST_IID
+ *
+ * Define broadcast IID for spinel frames dedicated to all hosts in multipan configuration.
+ * Host interfaces use IID 0 .. COUNT-1; broadcast takes the next slot.
+ *
+ */
+#ifdef OPENTHREAD_SPINEL_CONFIG_BROADCAST_IID
+#error `OPENTHREAD_SPINEL_CONFIG_BROADCAST_IID` is redefined.
+#endif
+#if CONFIG_OPENTHREAD_MULTIPAN_RCP_ENABLE
+#define OPENTHREAD_SPINEL_CONFIG_BROADCAST_IID SPINEL_HEADER_IID(CONFIG_OPENTHREAD_MULTIPLE_INTERFACES_COUNT)
+#endif
+
 /*----The following options set fixed default values but can be overridden by the user header file.----*/
 
 #if CONFIG_OPENTHREAD_LINK_METRICS