IDF release/v3.3 (#3339)

* IDF release/v3.3 46b12a560

* fix build

* IDF release/v3.3 367c3c09c

tools/sdk/include/mqtt/mqtt_supported_features.h

@@ -0,0 +1,49 @@
+// Copyright 2015-2019 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.
+
+#ifndef _MQTT_SUPPORTED_FEATURES_H_
+#define _MQTT_SUPPORTED_FEATURES_H_
+
+#if __has_include("esp_idf_version.h")
+#include "esp_idf_version.h"
+#endif
+
+/**
+ * @brief This header defines supported features of IDF which mqtt module
+ *        could use depending on specific version of ESP-IDF.
+ *        In case "esp_idf_version.h" were not found, all additional
+ *        features would be disabled
+ */
+
+#ifdef ESP_IDF_VERSION
+
+#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(3, 3, 0)
+// Features supported from 3.3
+#define MQTT_SUPPORTED_FEATURE_EVENT_LOOP
+#endif
+
+#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 0, 0)
+// Features supported in 4.0
+#define MQTT_SUPPORTED_FEATURE_WS_SUBPROTOCOL
+#define MQTT_SUPPORTED_FEATURE_TRANSPORT_ERR_REPORTING
+#endif
+
+#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 1, 0)
+// Features supported in 4.1
+#define MQTT_SUPPORTED_FEATURE_PSK_AUTHENTICATION
+#define MQTT_SUPPORTED_FEATURE_DER_CERTIFICATES
+#endif
+#endif
+
+#endif // _MQTT_SUPPORTED_FEATURES_H_