How to return complete data while read a message ?

[HarizahSyawal]

Hello, i have do some integration for vending machine using mdb protocol and i'm using this library to communicated with. My issue here is whenever i read response from vending machine, it return line by line and the message not completed read in one line.

it supposed to be like this :

Here is my code :

` private void receivedMessage(ArrayDeque<byte[]> datas) {

    char STX = '\u0002'; // Start of Text
    char ETX = '\u0003'; // End of Text
    SpannableStringBuilder spn = new SpannableStringBuilder();

    for (byte[] data : datas) {
        String msg = new String(data);
        String messageWithoutSTXETX = msg.replace(STX, ' ').replace(ETX, ' ');
        spn.append(messageWithoutSTXETX);
    }
    mTvReceiveText.append(TextUtil.newline_crlf+spn);
    Log.d(TAG,"FINAL MESSAGE "+spn);

    if (String.valueOf(spn).contains("1300") || String.valueOf(spn).startsWith("1300")) {
        handleReceivedMessage(String.valueOf(spn).trim());
    }
    else {
        Log.d(TAG, "not indicate a Vend Request : ");
    }
}`

[kai-morich]

see https://github.com/mik3y/usb-serial-for-android/wiki/FAQ#user-content-When_reading_a_message_why_dont_all_bytes_arrive_at_the_same_time

[HarizahSyawal]

just now i have try your suggestion based on wiki that you share. The issue is whenever i put breakpoint, let say on the loop while read a messages it return completely but when i run without debug or get breakpoint the messages come out separately.

[kai-morich]

with debugging you change timing and therefore buffering behavior. Better use logcat output for analysis