event loop: re-implement based on esp_event library

Includes ds2ds unit test fix, iperf example test fix

components/esp_wifi/src/mesh_event.c

@@ -0,0 +1,36 @@
+// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+//
+// 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 <string.h>
+#include "esp_event.h"
+#include "esp_mesh.h"
+
+/* mesh event callback handler */
+mesh_event_cb_t g_mesh_event_cb = NULL;
+
+void esp_event_mesh_hook(system_event_t* event)
+{
+    if (event->event_id == SYSTEM_EVENT_STA_GOT_IP || event->event_id == SYSTEM_EVENT_STA_LOST_IP) {
+        if (g_mesh_event_cb) {
+            mesh_event_t mevent;
+            if (event->event_id == SYSTEM_EVENT_STA_GOT_IP) {
+                mevent.id = MESH_EVENT_ROOT_GOT_IP;
+                memcpy(&mevent.info.got_ip, &event->event_info.got_ip, sizeof(system_event_sta_got_ip_t));
+            } else {
+                mevent.id = MESH_EVENT_ROOT_LOST_IP;
+            }
+            g_mesh_event_cb(mevent);
+        }
+    }
+}