fix memory leak (heap)

src/main.cpp

@@ -260,12 +260,7 @@ void ICACHE_FLASH_ATTR sendValues() {
 
   WiFi.forceSleepWake();
   delay(1);  // yield();
-  WiFi.persistent(false); // don't load and save credentials to flash
   WiFi.mode(WIFI_STA);
-  wifiMulti.addAP("nether.net", PWD_NETHERNET);
-  wifiMulti.addAP("LNet", PWD_LNET);
-  wifiMulti.addAP("hw1_gast", PWD_HW1);
-  wifiMulti.addAP("Freifunk", "");
 
   if ( ip != INADDR_NONE && dns != INADDR_NONE && gateway != INADDR_NONE && subnet != INADDR_NONE
        && ((ip[0] == 192 && ip[1] == 168) || (ip[0] == 172 && ip[1] == 16))
@@ -430,8 +425,14 @@ void setup() {
 
   geigeraverage.clear();
 
-  previousMillis = rtcMillis();
+  //WiFi.persistent(false); // don't load and save credentials to flash
+  WiFi.mode(WIFI_STA);
+  wifiMulti.addAP("nether.net", PWD_NETHERNET);
+  wifiMulti.addAP("LNet", PWD_LNET);
+  wifiMulti.addAP("hw1_gast", PWD_HW1);
+  wifiMulti.addAP("Freifunk", "");
 
+  previousMillis = rtcMillis();
   DEBUG_MSG("ready.\n"); //Serial.flush();
 }
 
@@ -446,6 +447,8 @@ void loop() {
     geiger_counts = 0;
   }
   DEBUG_MSG("sleeping now... (%u)\n", currentMillis);
+  DEBUG_MSG("heap: %d\n", ESP.getFreeHeap());
+
   delay(10);
   lightsleep();
   delay(10); // debounce?