My app uses a UDP network protocol involving very little data. But the round-trip latency is important. I have heard that 3G latency is more variable than wi-fi, especially after a long period of inactivity. My app will use the network data after several hours of inactivity, and I want that very first access to have the shortest possible latency. (It is querying a network time server). I thought about sending out some nonsense UDP packets to some other host just to "wake up the channel", since I am told that the 3G network switches to faster response only after a few hits. But then I thought it might be simpler just to insist that wi-fi be available to provide this particular function. So is there anything in the API that allows me to either query if wi-fi is available, or to force the network access to use only wi-fi?
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