My ESP8266 NodeMcu Lua scripts.. I'll just usually only use init.lua, but you can do whatever you want.

doorbell.lua

-- GET request on input, https://gist.github.com/saihtaM/35681a39385fbbd92974
-- I use this on my doorbell, but I have a little mic module that returns 3V on GPIO2 when a high sound is detected. That little mic module is hidden inside the doorbell.
-- This way, if the power is out. My doorbell stil works, and I don't have to think about killing my ESP8266 due to the voltage spikes that my doorbell is so happy to spit out (according to my multimeter).

pin = 4 -- 3 = GPIO0, 4 = GPIO2
firstrun = true
gpio.mode(pin,gpio.INPUT)

function pinsendrequest()
	print("Sending request")
	conn=net.createConnection(net.TCP, false) 
 	conn:on("receive", function(conn, pl) print(pl) end)
 	conn:connect(80,"192.168.1.2")
 	conn:send("GET /esp8266_control.php?what=ESP01Doorbell HTTP/1.1\r\nHost: replace.if.needed\r\n"
		.."Connection: keep-alive\r\nAccept: */*\r\n\r\n")
	conn:send("\r\n")
end
gpio.trig(pin, "up", pinsendrequest)

function checkip()
	if wifi.sta.getip() == nil then
		print "I have no ip..." -- This also makes the little blue LED flash, so you can see when your WiFi is gone.
	else
		if firstrun == true then
			print(wifi.sta.getip())
			pinsendrequest(1)
			firstrun = false
		end
	end
end

tmr.alarm(5, 1000, 1, checkip)