wifi.setmode(wifi.STATION)
wifi.sta.config("wangganyi","23109601wgy") 
wifi.sta.connect() 

function refreshTime()
    time = rtctime.epoch2cal(rtctime.get())
    print(string.format("%04d/%02d/%02d %02d:%02d:%02d", 
                        time["year"], 
                        time["mon"], 
                        time["day"], 
                        time["hour"] + 8, 
                        time["min"], 
                        time["sec"]))
end

tmr.alarm(1, 1000, 1, function() 
if wifi.sta.getip()== nil then
  print("IP unavaiable, Waiting...")
else
tmr.stop(1)
print("Config done, IP is "..wifi.sta.getip())
sntp.sync("202.120.2.101", 
            function()
                print("sync succeeded")
                tmr.alarm(0, 1000, tmr.ALARM_AUTO, refreshTime)
            end,
            function(index)
                print("failed : "..index)
            end)
end
end)