ESP8266_assign_static_IP_addresses

/*
It always is a hassle if the router assigns a different IP address through DHCP because you have to open the serial monitor to see what's going on. I was already about to install in my lamps a little display, but the I found the solution.
So it is much easier if you can set a static IP:
I wasn't able to put it so neatly into the code like you, so I just commented in and out;  but here is the recipe:
*/
AccessPoint:
ESP8266WebServer server(80);
IPAddress apIP(192, 168, 5, 1);  // if you want to configure another IP address comment it out for WebServer

[in setup()]
  WiFi.mode(WIFI_AP);
  WiFi.softAPConfig(apIP, apIP, IPAddress(255, 255, 255, 0));
  WiFi.softAP(ssid, password);
  server.begin();


Webserver:
WiFi.mode(WIFI_STA);
// WiFi.config(IPAddress (your_new_IP), IPAddress (StandardGateway IP), IPAddress (255, 255, 255, 0));  // works only when I explicitely enter values
WiFi.config(IPAddress (192,168,1,160), IPAddress (192,168,1,1), IPAddress (255, 255, 255, 0));  // works only when I explicitely enter values
WiFiStart();