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.c

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2015-2019 Alibaba Group Holding Limited
+ */
+
+#include "infra_config.h"
+
+int at_conn_init(void);
+int at_parser_init(void);
+
+/* See detail struct definition in at_wrapper.h */
+struct at_conn_input;
+struct at_mqtt_input;
+int at_conn_input(struct at_conn_input *param);
+int at_mqtt_input(struct at_mqtt_input *param);
+
+int IOT_ATM_Init(void)
+{
+#ifdef AT_PARSER_ENABLED
+    if (at_parser_init() < 0) {
+    	return -1;
+    }
+#endif
+
+#ifdef AT_TCP_ENABLED
+    if (at_conn_init() < 0) {
+    	return -1;
+    }
+#endif
+
+    return 0;
+}
+
+
+int IOT_ATM_Input(void * param) 
+{ 
+	int ret = -1;
+
+#if defined(AT_TCP_ENABLED)
+    ret = at_conn_input((struct at_conn_input *)param);
+#elif defined(AT_MQTT_ENABLED)
+    ret = at_mqtt_input((struct at_mqtt_input *)param);
+#endif
+
+    return ret;
+}