Number of bytes receives not the same after each cycle

[AUDI_ENG]

Between lines 8 and 9 of my code should be :

if( (dataBuffer.size() - indexOfFrame) < frameLen )
    return; // frame is not complete

if( (dataBuffer.size() - indexOfFrame) < frameLen )
    return; // frame is not complete

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Line 10 sholud be :

dataBuffer = dataBuffer.right(indexOfFrame+frameLen);//remove processed data from the buffer

dataBuffer = dataBuffer.right(indexOfFrame+frameLen);//remove processed data from the buffer

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I have not tested my code. This is just an example of how something should look.

I have always 11 bytes and the beginning AAAA (working perfectly)
but I have still the problem about losing data, its normal to losing data (because somtimes the nombre of bytes availables is more then 22 for exemple --> so I lost one frame) ??