diff --git a/src/main.cpp b/src/main.cpp
index f942395..b8800d0 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -28,6 +28,7 @@ const char* server = "ingress.opensensemap.org";
 
 constexpr unsigned int postingInterval = 60000; //Uploadintervall in Millisekunden
 constexpr unsigned int powerbankInterval = 10000;
+constexpr unsigned int dhcp_interval = 60*60*1000;
 
 //senseBox ID
 #define SENSEBOX_ID "5a9e9e38f55bff001a494877"
@@ -75,6 +76,10 @@ SDS011 sds;
 volatile unsigned long geiger_counts = 0;
 unsigned long geiger_previousMillis;
 unsigned long last_wifi_activity = 0;
+unsigned long last_dhcp = 0;
+IPAddress ip, dns, gateway, subnet;
+char ssid[64];
+char password[64];
 
 struct __attribute__((packed)) SENSOR_DATA {
   float temperature;
@@ -91,7 +96,7 @@ struct __attribute__((packed)) SENSOR_DATA {
 
 
 void sendESPNOW() {
-  unsigned long espnowmillis = millis();
+//  unsigned long espnowmillis = millis();
   uint8_t remoteMac[] = {0x5C, 0xCF, 0x7F, 0x5, 0xFD, 0xF0};
   #define WIFI_CHANNEL 1
 
@@ -156,7 +161,7 @@ void ICACHE_FLASH_ATTR sendValues() {
   }
 
                   Serial.printf("Temperature  : %6.2f°C    (DHT22)\n", sd.temperature);
-                  Serial.printf("Humidity     : %6.2f%     (DHT22)\n", sd.humidity);
+                  Serial.printf("Humidity     : %6.2f%%     (DHT22)\n", sd.humidity);
                   Serial.printf("Temperature  : %6.2f°C    (BMP180)\n", sd.temp2);
                   Serial.printf("Pressure     : %6.2fhPa   (BMP180)\n", sd.pressure);
   if (!sds_error) Serial.printf("Particles 10 : %6.2fµg/m³ (SDS011)\n", sd.p10);
@@ -214,23 +219,63 @@ void ICACHE_FLASH_ATTR sendValues() {
   wifiMulti.addAP("nether.net", "password1");
   wifiMulti.addAP("LNet", "password2");
   wifiMulti.addAP("Freifunk", "");
-  int tries = 0;
-  constexpr unsigned int retry_delay = 500;
-  while (wifiMulti.run() != WL_CONNECTED) {
-    tries++;
-    Serial.print(".");
-    if (tries*retry_delay >= powerbankInterval) {
-      Serial.println(" [ERROR]");
-      Serial.println("Retrying in 10 seconds..");
-      sendESPNOW();
-      delay(powerbankInterval);
-      ESP.restart();
+
+  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))
+       && strlen(ssid) > 0 && strlen(password) > 0
+       && (millis() - last_dhcp < dhcp_interval)
+     ) {
+
+    Serial.println("static ip");
+    WiFi.config(ip, dns, gateway, subnet);
+    WiFi.begin(ssid, password);
+    int tries = 0;
+    constexpr unsigned int retry_delay = 500;
+    while (WiFi.status() != WL_CONNECTED) {
+      tries++;
+      Serial.print(".");
+      if (tries*retry_delay >= powerbankInterval) {
+        Serial.println(" [ERROR]");
+        Serial.println("Retrying in 10 seconds..");
+        sendESPNOW();
+        delay(powerbankInterval);
+        ESP.restart();
+      }
+      delay(retry_delay);
     }
-    delay(retry_delay);
+    Serial.println(" [CONNECTED, static]");
+    Serial.print("IP address: ");
+    Serial.println(WiFi.localIP());
+
+  } else {
+    Serial.println("dhcp");
+    int tries = 0;
+    constexpr unsigned int retry_delay = 500;
+    while (wifiMulti.run() != WL_CONNECTED) {
+      tries++;
+      Serial.print(".");
+      if (tries*retry_delay >= powerbankInterval) {
+        Serial.println(" [ERROR]");
+        Serial.println("Retrying in 10 seconds..");
+        sendESPNOW();
+        delay(powerbankInterval);
+        ESP.restart();
+      }
+      delay(retry_delay);
+    }
+    Serial.println(" [CONNECTED, dhcp]");
+    Serial.print("IP address: ");
+    Serial.println(WiFi.localIP());
+
+    ip = WiFi.localIP();
+    dns = WiFi.dnsIP();
+    gateway = WiFi.gatewayIP();
+    subnet = WiFi.subnetMask();
+    strncpy(ssid, WiFi.SSID().c_str(), 64);
+    strncpy(password, WiFi.psk().c_str(), 64);
+    last_dhcp = millis();
   }
-  Serial.println(" [CONNECTED]");
-  Serial.print("IP address: ");
-  Serial.println(WiFi.localIP());
+
 
   int httpCode = 0;
   for (int tries=0; tries<3 && httpCode != HTTP_CODE_CREATED; tries++) {
@@ -294,12 +339,14 @@ void setup() {
 }
 
 void loop() {
+  //Serial.println(millis() - last_wifi_activity);
   sendValues();
 
   /* keep powerbank happy */
-  for(int i=0; i<(postingInterval/powerbankInterval)-1; i++) {
+  for(int i=0; i<(postingInterval/powerbankInterval); i++) {
     delay(powerbankInterval);
+    //Serial.println(millis() - last_wifi_activity);
     sendESPNOW();
   }
-  delay(powerbankInterval);
+  //delay(powerbankInterval);
 }