I will repeat myself : I would look into Athmosphere.--
This is a wrapper around websockets so you don't have to do the bear bones stuff yourself. And they talk about GWT on their Github page : https://github.com/Atmosphere/atmosphere-extensions/wiki/Atmosphere-GWT
I used SignalR which is also a wrapper around Websockets, and falls automatic back to other stuff if it fails. No GWT support though so I wrote my own wrapper in about a day. Another problem for you probably is that SignalR needs an IIS server.
Whatever you do : don't use timers !
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