Add a new extension library: connection (#39)

samples/simple/wasm-apps/sensor.c

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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 "wasm_app.h"
+
+static sensor_t sensor = NULL;
+
+/* Sensor event callback*/
+void sensor_event_handler(sensor_t sensor, attr_container_t *event,
+                          void *user_data)
+{
+    printf("### app get sensor event\n");
+    attr_container_dump(event);
+}
+
+void on_init()
+{
+    char *user_data;
+    attr_container_t *config;
+
+    printf("### app on_init 1\n");
+    /* open a sensor */
+    user_data = malloc(100);
+    printf("### app on_init 2\n");
+    sensor = sensor_open("sensor_test", 0, sensor_event_handler, user_data);
+    printf("### app on_init 3\n");
+
+    /* config the sensor */
+    sensor_config(sensor, 1000, 0, 0);
+    printf("### app on_init 4\n");
+
+    /*
+     config = attr_container_create("sensor config");
+     sensor_config(sensor, config);
+     attr_container_destroy(config);
+     */
+}
+
+void on_destroy()
+{
+    if (NULL != sensor) {
+        sensor_config(sensor, 0, 0, 0);
+    }
+    /* real destroy work including killing timer and closing sensor is
+       accomplished in wasm app library version of on_destroy() */
+}