feat(openthread): handle MeshCoP mDNS service in state change callback

components/openthread/include/esp_openthread_border_router.h

@@ -76,6 +76,14 @@ esp_netif_t *esp_openthread_get_backbone_netif(void);
  */
 esp_err_t esp_openthread_set_meshcop_instance_name(const char *instance_name);
 
+/**
+ * @brief   Gets the meshcop(e) instance name.
+ *
+ * @return      The instance name.
+ *
+ */
+const char* esp_openthread_get_meshcop_instance_name(void);
+
 #ifdef __cplusplus
 }
 #endif

components/openthread/include/esp_openthread_meshcop_mdns.h

@@ -0,0 +1,41 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include "esp_openthread.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   Publishes the OpenThread meshcop service in mDNS
+ *
+ * @param[in] instance_name Instance name of meshcop mDNS service
+ *
+ * @return
+ *      - ESP_OK success
+ *      - ESP_ERR_NO_MEM memory error
+ *      - ESP_FAIL failed to add service
+ *
+ */
+esp_err_t esp_openthread_publish_meshcop_mdns(const char *instance_name);
+
+/**
+ * @brief   Removes the OpenThread meshcop service in mDNS
+ *
+ * @return
+ *      - ESP_OK success
+ *      - ESP_ERR_NO_MEM memory error
+ *      - ESP_FAIL failed to remove service
+ *
+ */
+esp_err_t esp_openthread_remove_meshcop_mdns(void);
+
+#ifdef __cplusplus
+}
+#endif

components/openthread/private_include/esp_openthread_state.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2023-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -10,6 +10,11 @@
 #include <esp_openthread.h>
 #include <esp_openthread_types.h>
 
+#define ESP_OPENTHREAD_BORDER_ROUTER_FLAG_OF_INTEREST                                                       \
+    (OT_CHANGED_THREAD_ROLE | OT_CHANGED_THREAD_EXT_PANID | OT_CHANGED_THREAD_NETWORK_NAME |                \
+     OT_CHANGED_ACTIVE_DATASET | OT_CHANGED_THREAD_PARTITION_ID | OT_CHANGED_THREAD_BACKBONE_ROUTER_STATE | \
+     OT_CHANGED_PSKC)
+
 #ifdef __cplusplus
 extern "C" {
 #endif

components/openthread/src/port/esp_openthread_state.c

@@ -10,7 +10,9 @@
 #include <esp_check.h>
 #include <esp_event.h>
 #include <esp_log.h>
+#include <esp_openthread_border_router.h>
 #include <esp_openthread_dns64.h>
+#include <esp_openthread_meshcop_mdns.h>
 #include <esp_openthread_netif_glue_priv.h>
 #include <esp_openthread_radio.h>
 #include <esp_openthread_state.h>
@@ -19,6 +21,19 @@
 
 #define TAG "OT_STATE"
 
+#if CONFIG_OPENTHREAD_BORDER_ROUTER
+static void handle_ot_border_router_state_changed(otInstance* instance)
+{
+    otDeviceRole role = otThreadGetDeviceRole(esp_openthread_get_instance());
+
+    if (role == OT_DEVICE_ROLE_CHILD || role == OT_DEVICE_ROLE_ROUTER || role == OT_DEVICE_ROLE_LEADER) {
+        esp_openthread_publish_meshcop_mdns(esp_openthread_get_meshcop_instance_name());
+    } else {
+        esp_openthread_remove_meshcop_mdns();
+    }
+}
+#endif
+
 static void handle_ot_netif_state_change(otInstance* instance)
 {
     if (otIp6IsEnabled(instance)) {
@@ -123,6 +138,12 @@ static void ot_state_change_callback(otChangedFlags changed_flags, void* ctx)
         return;
     }
 
+#if CONFIG_OPENTHREAD_BORDER_ROUTER
+    if (changed_flags & ESP_OPENTHREAD_BORDER_ROUTER_FLAG_OF_INTEREST) {
+        handle_ot_border_router_state_changed(instance);
+    }
+#endif
+
     if (changed_flags & OT_CHANGED_THREAD_ROLE) {
         handle_ot_role_change(instance);
     }