Fix hangup on no internet

lib/ESP32Ping/ESP32Ping.h

@@ -0,0 +1,72 @@
+/*
+  ESP32Ping - Ping library for ESP32
+  Copyright (c) 2018 Marian Craciunescu. All rights reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef ESP32PING_H
+#define ESP32PING_H
+
+#include <Arduino.h>
+#include <Network.h>
+
+//extern "C" {
+#include <ping.h>
+//}
+
+#ifdef ENABLE_DEBUG_PING
+#define DEBUG_PING(...) Serial.printf(__VA_ARGS__)
+#else
+#define DEBUG_PING(...)
+#endif
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+void esp_schedule(void);
+void esp_yield(void);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+class PingClass {
+public:
+    PingClass();
+
+    bool ping(IPAddress dest, byte count = 5);
+
+    bool ping(const char *host, byte count = 5);
+
+    float averageTime();
+
+protected:
+    static void _ping_sent_cb(void *opt, void *pdata);
+
+    static void _ping_recv_cb(void *opt, void *pdata);
+
+    IPAddress _dest;
+    ping_option _options;
+
+    static byte _expected_count, _errors, _success;
+    static float _avg_time;
+};
+
+
+extern PingClass Ping;
+
+#endif