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_api.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2015-2019 Alibaba Group Holding Limited
+ */
+
+#ifndef _AT_API_H_
+#define _AT_API_H_
+
+/**
+ * AT module initialization. 
+ * Call this function before example starts.
+ * at_parser or at_tcp will be initialized if enabled.
+ * @param[in] none
+ * 
+ * @return 0 - success, -1 - failure
+ */
+int IOT_ATM_Init(void);
+
+
+/**
+ * Hand received data to ATM layer.
+ * Call this function in low-layer HAL.
+ * @param[in] param pointer to input struct.
+ *            See struct at_conn_input and struct at_mqtt_input
+ *            in at_wrapper.h
+ *
+ * @return  0 - success, -1 - failure
+ */
+int IOT_ATM_Input(void * param);
+
+#endif