add new qloud-c-sdk component

components/connectivity/iot-hub-device-c-sdk/services/common/system/test/.clang-format

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+Language: Cpp
+BasedOnStyle: Google
+ColumnLimit: 120
+DerivePointerAlignment: true
+PointerAlignment: Left
+SortIncludes: true
+IncludeBlocks: Preserve
+IndentPPDirectives: AfterHash

components/connectivity/iot-hub-device-c-sdk/services/common/system/test/test_system_mqtt.cc

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+/**
+ * @copyright
+ *
+ * Tencent is pleased to support the open source community by making IoT Hub available.
+ * Copyright(C) 2018 - 2021 THL A29 Limited, a Tencent company.All rights reserved.
+ *
+ * Licensed under the MIT License(the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://opensource.org/licenses/MIT
+ *
+ * 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.
+ *
+ * @file test_broadcast.cc
+ * @brief
+ * @author fancyxu (fancyxu@tencent.com)
+ * @version 1.0
+ * @date 2021-07-18
+ *
+ * @par Change Log:
+ * <table>
+ * <tr><th>Date       <th>Version <th>Author    <th>Description
+ * <tr><td>2021-07-18 <td>1.0     <td>fancyxu   <td>first commit
+ * <tr><td>2022-01-26 <td>1.1     <td>hubert    <td>add serverip  test
+ * </table>
+ */
+
+#include <iostream>
+#include <string>
+
+#include "gtest/gtest.h"
+#include "mqtt_client_test.h"
+#include "qcloud_iot_common.h"
+
+namespace mqtt_client_unittest {
+
+/**
+ * @brief Test system mqtt.
+ *
+ */
+TEST_F(MqttClientTest, system_mqtt) {
+  uint32_t time_stamp = 0;
+  char server_ip[256] = {0};
+  ASSERT_EQ(IOT_Sys_GetTime(client, &time_stamp), 0);
+  ASSERT_EQ(IOT_Sys_SyncNTPTime(client), 0);
+  ASSERT_EQ(IOT_Sys_GetServerIp(client, server_ip), 0);
+}
+
+}  // namespace mqtt_client_unittest