Initial WiFi Setup before v3.0
On first use or if the connected network changes or disappears, WiFi Manager will setup an network named brewpiless. If you have ever the ESP8266 connected to your router by running any sketch, the network setting will be saved in a special region and BPL will connect to that specific original network without creating the brewpiless network.
Using your computer to connect to brewpiless network, and you will be presented a setup page. If the setup page doesn't show automatically, open your browser for any random page, like google.com. (A modified version of) WiFi Manager is used to setup the the network.
You can use the page to select and setup the networking. If static IP is desired, fill the Static IP and Gateway fields. Otherwise, leave them alone, blank.
After three minutes, ESP8266 will proceed to enter soft AP mode. That means you only have three minutes to setup the network. The reason for it is that when BPL recovers from a power shortage and the network is not available, maybe not yet recovering, BPL will not hang there waiting user's input.
After having BPL connect to the network, you can access it by its IP or mDNS domain name. Apple's platforms support mDNS, and if you have iTunes installed in your Windows, mDNS is installed, too. Otherwise, you will have to find out its IP by checking it on your router. The default hostname is brewpiless, so the default mDNS domain name is brewpiless.local. Browse to the url to start using BPL.
If you want to reconnect to another network or run the WiFi setup again, you must erase the WiFi credential which will survive even after refreshing or formatting file system. To erase the WiFi setting, use your browser and enter the following URL(assuming the hostname is brewpiless)
http://brewpiless.local/erasewifisetting
Reference: https://github.com/tzapu/WiFiManager