support aliyun sdk on TencentOS tiny

sample: examples\aliyun_iotkit_csdk_mqtt
project: board\TencentOS_tiny_EVB_MX_Plus\KEIL\aliyun_iotkit_csdk_mqtt

components/connectivity/iotkit-embedded-3.0.1/3rdparty/src/atm/at_conn_mgmt.h

@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2015-2019 Alibaba Group Holding Limited
+ */
+
+#ifndef _AT_CONN_MGMT_H_
+#define _AT_CONN_MGMT_H_
+
+typedef enum netconn_type {
+    NETCONN_INVALID  = 0,
+    /** TCP IPv4 */
+    NETCONN_TCP,
+    NETCONN_TYPE_NUM
+} netconn_type_t;
+
+/**
+ * at connection module initialization
+ *
+ * @param null
+ *
+ * @return  0 : on success, -1: error
+ */
+int at_conn_init(void);
+
+/**
+ * receive data from an at connection 
+ *
+ * @param[in]: connection id; 
+ * @param[out]: pointer to output buffer
+ * @param[in]: expect length
+ *
+ * @return  0 : on success, -1: error
+ */
+int at_conn_recv(int connid, void *mem, uint32_t len);
+
+/**
+ * query ip from domain address
+ *
+ * @param[in]: domain address
+ * @param[out]: query result
+ *
+ * @return  0 : on success, -1: error
+ */
+int at_conn_getaddrinfo(const char *nodename, char resultip[16]);
+
+
+/**
+ * setup an new at connection
+ *
+ * @param[in]: connection type only tcp support 
+ *
+ * @return  0 : on success, -1: error
+ */
+int at_conn_setup(netconn_type_t type);
+
+/**
+ * start an at connection
+ *
+ * @param[in]: connection id
+ * @param[in]: remote ip address
+ * @param[in]: remote port
+ *
+ * @return  0 : on success, -1: error
+ */
+int at_conn_start(int connid, char* remoteipaddr, uint16_t remoteport);
+
+/**
+ * close an at connection
+ *
+ * @param[in] connection id
+ *
+ * @return  0 : on success, -1: error
+ */
+int at_conn_close(int connid);
+
+/**
+ * check whether recvbuf empty
+ *
+ * @param[in] connection id
+ *
+ * @return  0 : on success, -1: error
+ */
+int at_conn_recvbufempty(int connid);
+
+/**
+ * send data through an at connection
+ *
+ * @param[in] connection id
+ * @param[in] send buf pointer
+ *
+ * @return  0 : on success, -1: error
+ */
+int at_conn_send(int connid, const void *data, uint32_t size);
+
+#endif