Add a new extension library: connection (#39)

samples/simple/wasm-apps/request_sender.c

@@ -0,0 +1,58 @@
+/*
+ * 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 void my_response_handler(response_t *response, void *user_data)
+{
+    char *tag = (char *) user_data;
+
+    if (response == NULL) {
+        printf("[req] request timeout!\n");
+        return;
+    }
+
+    printf("[req] response handler called mid:%d, status:%d, fmt:%d, payload:%p, len:%d, tag:%s\n",
+           response->mid, response->status, response->fmt, response->payload,
+           response->payload_len, tag);
+
+    if (response->payload != NULL
+        && response->payload_len > 0
+        && response->fmt == FMT_ATTR_CONTAINER) {
+        printf("[req] dump the response payload:\n");
+        attr_container_dump((attr_container_t *) response->payload);
+    }
+}
+
+static void test_send_request(char *url, char *tag)
+{
+    request_t request[1];
+
+    init_request(request, url, COAP_PUT, 0, NULL, 0);
+    api_send_request(request, my_response_handler, tag);
+}
+
+void on_init()
+{
+    test_send_request("/app/request_handler/url1", "a request to target app");
+    test_send_request("url1", "a general request");
+}
+
+void on_destroy()
+{
+    /* real destroy work including killing timer and closing sensor is
+       accomplished in wasm app library version of on_destroy() */
+}