Implement progressive backoff and improve error reporting #126
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We needed to wait a little bit longer for the OSError's to come back so we now backoff progressively up to 3s between sends and increases the timeout to 13s since it can take a few more seconds for error to arrive. This means we now get a much better error when the bulb is offline, and we aren't making a situation where the problem is wifi congestion even worse.
Also since we are using a future, it doesn't matter which udp message the bulb gets and respond to, since as soon as it does, the send task will be canceled and we will declare success.