merge new qcloud sdk

1. qcloud has a great revolution, the protocol has been changed to implement data template, so the old TencentCloud_SDK developed by us will not work fine now(mqtt still works, but data template will not works fine for recently created product/devices).

2. I merge the official qlcoud sdk(include both the iot-hub and iot-explorer sdk) into the componet/conectivity to support new protocol of data template

3. iot-hub sdk, supply the fundamental iot protocol(like mqtt coap, etc.)
iot-explorer sdk, supply the high level service like data template based on mqtt

4. To know how it works, see qcloud_iot_explorer_sdk_data_template、qcloud_iot_hub_sdk_mqtt example(keil project in board\TencentOS_tiny_EVB_MX_Plus\KEIL\qcloud_iot_explorer_sdk_data_template and  board\TencentOS_tiny_EVB_MX_Plus\KEIL\qcloud_iot_hub_sdk_mqtt)

components/connectivity/qcloud-iot-hub-sdk-3.1.2/3rdparty/sdk_src/network/tls/network_tls.c

@@ -0,0 +1,117 @@
+/*
+ * Tencent is pleased to support the open source community by making IoT Hub available.
+ * Copyright (C) 2016 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.
+ *
+ */
+
+#include "network_interface.h"
+#include "qcloud_iot_export_error.h"
+#include "qcloud_iot_import.h"
+#include "utils_param_check.h"
+
+/*
+ * TLS/DTLS network API
+ */
+#ifndef AUTH_WITH_NOTLS 
+
+int network_tls_init(Network *pNetwork)
+{
+    return QCLOUD_RET_SUCCESS;
+}
+
+int network_tls_connect(Network *pNetwork)
+{
+    POINTER_SANITY_CHECK(pNetwork, QCLOUD_ERR_INVAL);
+    
+    int ret = QCLOUD_ERR_FAILURE;
+    
+    pNetwork->handle = (uintptr_t)HAL_TLS_Connect(&(pNetwork->ssl_connect_params), pNetwork->host, pNetwork->port);
+    if (pNetwork->handle != 0) {
+        ret = QCLOUD_RET_SUCCESS;
+    }
+    
+    return ret;
+}
+
+int network_tls_read(Network *pNetwork, unsigned char *data, size_t datalen, uint32_t timeout_ms, size_t *read_len)
+{
+    POINTER_SANITY_CHECK(pNetwork, QCLOUD_ERR_INVAL);
+
+    int rc = HAL_TLS_Read(pNetwork->handle, data, datalen, timeout_ms, read_len);
+
+    return rc;
+}
+
+int network_tls_write(Network *pNetwork, unsigned char *data, size_t datalen, uint32_t timeout_ms, size_t *written_len)
+{
+    POINTER_SANITY_CHECK(pNetwork, QCLOUD_ERR_INVAL);
+
+    int rc =  HAL_TLS_Write(pNetwork->handle, data, datalen, timeout_ms, written_len);
+
+    return rc;
+}
+
+void network_tls_disconnect(Network *pNetwork)
+{
+    POINTER_SANITY_CHECK_RTN(pNetwork);
+
+    HAL_TLS_Disconnect(pNetwork->handle);
+    pNetwork->handle = 0;
+}
+
+#ifdef COAP_COMM_ENABLED
+
+int network_dtls_init(Network *pNetwork)
+{
+    return QCLOUD_RET_SUCCESS;
+}
+
+int network_dtls_read(Network *pNetwork, unsigned char *data, size_t datalen, uint32_t timeout_ms, size_t *read_len)
+{
+	POINTER_SANITY_CHECK(pNetwork, QCLOUD_ERR_INVAL);
+
+	return HAL_DTLS_Read(pNetwork->handle, data, datalen, timeout_ms, read_len);
+}
+
+int network_dtls_write(Network *pNetwork, unsigned char *data, size_t datalen, uint32_t timeout_ms, size_t *written_len)
+{
+	POINTER_SANITY_CHECK(pNetwork, QCLOUD_ERR_INVAL);
+
+	return HAL_DTLS_Write(pNetwork->handle, data, datalen, written_len);
+}
+
+void network_dtls_disconnect(Network *pNetwork)
+{
+	POINTER_SANITY_CHECK_RTN(pNetwork);
+
+	HAL_DTLS_Disconnect(pNetwork->handle);
+	pNetwork->handle = 0;
+
+	return ;
+}
+
+int network_dtls_connect(Network *pNetwork)
+{
+	POINTER_SANITY_CHECK(pNetwork, QCLOUD_ERR_INVAL);
+
+	int ret = QCLOUD_ERR_FAILURE;
+
+	pNetwork->handle = (uintptr_t)HAL_DTLS_Connect(&(pNetwork->ssl_connect_params), pNetwork->host, pNetwork->port);
+	if (pNetwork->handle != 0) {
+		ret = QCLOUD_RET_SUCCESS;
+	}
+
+	return ret;
+}
+#endif
+
+#endif