identify: Resturcturing identify to simplify application

Removed the separate identify component, and made it a part of esp_matter itself.
Added a common callback for the application.

components/esp_matter/esp_matter_identify.cpp

@@ -0,0 +1,72 @@
+// Copyright 2022 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <esp_log.h>
+#include <esp_matter_identify.h>
+
+#include <app/clusters/identify-server/identify-server.h>
+
+static const char *TAG = "esp_matter_identify";
+
+namespace esp_matter {
+namespace identify {
+
+static callback_t identify_callback = NULL;
+static void *identify_callback_priv_data = NULL;
+
+esp_err_t set_callback(callback_t callback, void *priv_data)
+{
+    identify_callback = callback;
+    identify_callback_priv_data = priv_data;
+    return ESP_OK;
+}
+
+static esp_err_t execute_callback(callback_type_t type, uint16_t endpoint_id, uint8_t effect_id)
+{
+    if (identify_callback) {
+        return identify_callback(type, endpoint_id, effect_id, identify_callback_priv_data);
+    }
+    return ESP_OK;
+}
+
+static void start_cb(Identify *identify)
+{
+    ESP_LOGI(TAG, "Start callback");
+    execute_callback(START, identify->mEndpoint, identify->mCurrentEffectIdentifier);
+}
+
+static void stop_cb(Identify *identify)
+{
+    ESP_LOGI(TAG, "Stop callback");
+    execute_callback(STOP, identify->mEndpoint, identify->mCurrentEffectIdentifier);
+}
+
+static void effect_cb(Identify *identify)
+{
+    ESP_LOGI(TAG, "Effect callback");
+    execute_callback(EFFECT, identify->mEndpoint, identify->mCurrentEffectIdentifier);
+}
+
+esp_err_t init(uint16_t endpoint_id, uint8_t identify_type)
+{
+    Identify *identify = new Identify(endpoint_id, start_cb, stop_cb, (EmberAfIdentifyIdentifyType)identify_type, effect_cb);
+    if (!identify) {
+        ESP_LOGE(TAG, "Fail to create identify object");
+        return ESP_FAIL;
+    }
+    return ESP_OK;
+}
+
+} /* identify */
+} /* esp_matter */