Android Bluetooth Input / Outputstream: ~ 1400 bytes sent, 1008 received

Question

I am trying to send data between two Android 4.0.1 phones, and when I send my data, I do not get the full array on the other hand.

My code is:

byte[] buffer = new byte[4096]; int bytes; bytes = inputStream.read(buffer); // bytes = 1008 // buffer[1008..4095] = 0 // =================== other side ============================= byte[] message = Tools.concatByteArray(response, authorizationMessage); // Debug tells me that the array has 1400 bytes outputStream.write(message); outputStream.flush(); 

Debug messages:

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So, I get the same data for the first bytes 1008, and after that I get nothing more.

Any idea how to fix this?

Answer 1

I had to solve a similar error. And the only related issue was in this topic, which has not yet been resolved. So I had to look for the reason and solution myself :).

The reason is that Android bluetooth seems to send data in bundles of 1008 bytes. Thus, you need to read from the stream in a while loop and concatenate the received bytes.

Here's how your code should be rewritten:

 byte[] buffer = new byte[4096]; ByteArrayOutputStream baos = new ByteArrayOutputStream(); int bytes; while ((bytes = inputStream.read(buffer, 0, buffer.length)) > -1) { baos.write(buffer, 0, bytes); baos.flush(); } byte[] message = baos.toByteArray(); // =================== other side ============================= byte[] message = Tools.concatByteArray(response, authorizationMessage); outputStream.write(message); outputStream.flush(); outputStream.close(); // <-- important! so the receiver knows that it is the end of data 

Answer 2

Please check Connection Management . "As you can see,

You must use a dedicated thread for all reading and writing threads. This is important because the read (byte []) and write (byte []) methods block calls . read (byte []) will block until it reads something from the stream . write (byte []) is usually not used in a block, but can block flow control if the remote device is not reading (byte []) fast enough and the intermediate buffers are full. So, your main loop in the stream should be dedicated to reading from an InputStream.

When I started encoding My Reader Thread, I read (byte []) the InputStream method will block execution until there is no desired number of bytes. But this is not so. I realized that it blocks until there is “something” to read from the stream (the part that I previously skipped).

View your package; 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09, you sent it using the OutputStream and reset it. You can only get part of it (even 1 byte → 0x01) in one read () call and get the rest (0x02 and the rest) in the next read () call. In this case, the return value for read () will be 1, and incomingBytes [0] will be 0x01, and the rest of the elements will be 0

Answer 3

Have you set the buffer size? Usually you read until there is more data.