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While my experience around the lack of documentation was similar, once it was working it was solid as a rock. What baud are you running at? Did you look at the android bluetooth chat samples? Thats really the easiest way to go. I spent a month dicking around with amarino, boy was that a waste of time. I was pushing full throttle on whatever baud I had it running at (which now escapes me, I remember it being part of the puzzle).
Did you write your own protocol? I did this, picked some random chars for a header and then packed all the data in behind it.
Why would you put your arduino in the engine compartment? It is far better off in the dash somewhere IMO. How are you going to protect it from the elements?
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