Kotlin readBytes() never completes

Question

I am only trying to write and read across a Bluetooth Socket but i my readBytes call is not completing. I think that this is very simple but maybe i am just using the wrong type of stream or something. As of right now my code is just sending a small amount of text as bytes. This is placeholder code that will be replaced with code that writes and reads a file over the stream. Here is my Receive Thread:

class ReceiveThread(val inStream:BufferedInputStream):Thread() {

var bytes:ByteArray? = null


override fun run() {
    BluetoothService.log("Begin ${BTS_Constants.THREAD_RECEIVE}")
    BluetoothService.log("preparing to read data")
    name = BTS_Constants.THREAD_RECEIVE

//here is my new code
    inStream.use {
        do{
            count++
            BluetoothService.log("read loop round $count")
            byteList.add(it.read() as Byte)
        }while (it.available()>0)
     }
    BluetoothService.log("data read: ${byteList.get(0) as Char}")
}
}

and here is my Send Thread:

class SendThread(val outStream:BufferedOutputStream, val file:File? = null):Thread(){

var bytes:ByteArray? = null

override fun run() {
    BluetoothService.log("Begin : ${BTS_Constants.THREAD_SEND}")
    name = BTS_Constants.THREAD_SEND

    bytes = "hello testing".toByteArray()
    try{
        outStream.use {
            it.write(bytes)
            it.flush()
        }
    }catch (ioe:IOException){

    }

    BluetoothService.log("data sent")
}

}

the data is successfully sent, and the BluetoothService.log("data sent") call is reached and displayed in the logcat for the device that is running a Send Thread. For the device running the Receive Thread logs the "Preparing to read data" message, but never logs the data read: "$bytes message".

How can i make this call to inStream.readBytes() complete?

Edit: new Error message that i am receiving:

11-27 23:45:29.298 16253-16413/com.example.zemcd.fileblue E/AndroidRuntime: FATAL EXCEPTION: RECEIVE
                                                                        Process: com.example.zemcd.fileblue, PID: 16253
                                                                        java.io.IOException: bt socket closed, read return: -1
                  at android.bluetooth.BluetoothSocket.read(BluetoothSocket.java:588)
                  at android.bluetooth.BluetoothInputStream.read(BluetoothInputStream.java:96)
                  at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
                  at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
                  at com.example.zemcd.fileblue.ReceiveThread.run(BluetoothService.kt:230)

Answer 1

If you look on source of Kotlin extension function readBytes you see that it starts loop while InputStream.read(buffer) > 0. According to documentation:

This method blocks until input data is available, end of file is detected, or an exception is thrown.

Second iteration of this loop freeze your program. So don't use method readBytes. Just read(buffer). For example - https://developer.android.com/guide/topics/connectivity/bluetooth.html#ManagingAConnection

Update:

Now ReceiveThread can receive one message from stream. But your bluetooth socket is close. So your problem is in setup bluetooth connection and inStream's initialization. Maybe you have wrong send part too.