esp8266 MQTT button

init.lua

wifi.setmode(wifi.STATION)
wifi.sta.config("SSID","PASSWORD")
wifi.sta.connect()
tmr.alarm(1, 100, 1, function() 
    if wifi.sta.getip() ~= nil then 
        tmr.stop(1)
        m = mqtt.Client( "ESP8266-" ..  node.chipid(), 120)
        m:connect( "192.168.1.13" , 1883, 0, function(conn)
            m:publish("button/1/pressed", "", 0, 0, function(conn)
                node.dsleep(0)
            end)
        end)
    end 
end)