node-mqtt-blinky.lua

wifi.setmode(wifi.STATION)
wifi.sta.config("YOUR SSID", "PASSWORD")

gpio.mode(4, gpio.OUTPUT)

tmr.alarm(0, 5000, 0, function()
	m = mqtt.Client("ESP8266"..node.chipid() , 120)
	m:connect("YOUR IP ADDRESS", 1883, 0, function(conn) 
		print("Connected to MQTT broker")
		m:subscribe("esp_led", 0)
	end)
	m:on("message", function(conn, topic, data)
		if data ~= nil then
			print("Received message on topic: " .. topic .. " with message: " .. data)
			if data == "1" then
				gpio.write(4, gpio.HIGH)
			elseif data == "0" then
				gpio.write(4, gpio.LOW)
			else
				print("The message must be 1 or 0")
			end
		end
		
	end)

end)