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copied!<p>Please check <a href="http://developer.android.com/guide/topics/connectivity/bluetooth.html#ManagingAConnection" rel="nofollow">Managing a Connection</a> part. As you can see;</p> <blockquote> <p>You should use a <em>dedicated thread</em> for all stream reading and writing. This is important because both <em>read(byte[])</em> and <em>write(byte[])</em> methods are <strong>blocking calls</strong>. <em>read(byte[])</em> will block <strong>until there is <em>something</em> to read from the stream</strong>. <em>write(byte[])</em> does not usually block, but can block for flow control if the remote device is not calling <em>read(byte[])</em> quickly enough and the intermediate buffers are full. So, your main loop in the thread should be dedicated to reading from the InputStream.</p> </blockquote> <p>When i started coding my <em>Reader Thread</em>, I tho <em>read(byte[])</em> method of InputStream will block execution until there are desired number of bytes. But it doesn't. I figured out that it does block until there is "something" to read from the stream (the part which i previously missed).</p> <p>Consider your package is; 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09, you sent it via OutputStream write and flushed. You might still get <strong>only a part of it</strong> (even 1 byte -> 0x01) in one read() call, and get the rest of it (0x02 and the rest) in the next read() call. In this case return value for read() will be equal to 1 and incomingBytes[0] will be 0x01 and the other elements will be 0</p>

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