Merge pull request wled#941 from gegu/master

Usermod: fix unreachable network services

usermods/Fix_unreachable_webserver/readme.md

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+# Fix unreachable Webserver
+
+This modification performs a ping request to the local IP address every 60 seconds. By this procedure the web server remains accessible in some problematic WLAN environments.
+
+The modification works with static or DHCP IP address configuration 
+
+_Story:_
+
+Unfortunately, with all ESP projects where a web server or other network services are running, I have the problem that after some time the web server is no longer accessible.  Now I found out that the connection is at least reestablished when a ping request is executed by the device.
+
+With this modification, in the worst case, the network functions are not available for 60 seconds until the next ping request.
+
+## Installation 
+
+Copy and replace the file `usermod.cpp` in wled00 directory.
+
+

usermods/Fix_unreachable_webserver/usermod.cpp

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+#include "wled.h"
+/*
+ * This file allows you to add own functionality to WLED more easily
+ * See: https://github.com/Aircoookie/WLED/wiki/Add-own-functionality
+ * EEPROM bytes 2750+ are reserved for your custom use case. (if you extend #define EEPSIZE in const.h)
+ * bytes 2400+ are currently ununsed, but might be used for future wled features
+ */
+
+#include <ping.h>
+
+const int PingDelayMs = 60000;
+long lastCheckTime = 0;
+bool connectedWiFi = false;
+ping_option pingOpt;
+
+//Use userVar0 and userVar1 (API calls &U0=,&U1=, uint16_t)
+
+//gets called once at boot. Do all initialization that doesn't depend on network here
+void userSetup()
+{
+
+}
+
+
+//gets called every time WiFi is (re-)connected. Initialize own network interfaces here
+void userConnected()
+{
+  connectedWiFi = true;
+  // initialize ping_options structure
+  memset(&pingOpt, 0, sizeof(struct ping_option));
+  pingOpt.count = 1;
+  pingOpt.ip = WiFi.localIP();
+}
+
+//loop. You can use "if (WLED_CONNECTED)" to check for successful connection
+void userLoop()
+{
+  if (connectedWiFi && millis()-lastCheckTime > PingDelayMs)
+  {
+    ping_start(&pingOpt);
+    lastCheckTime = millis();
+  }
+}