Thank you and I appreciate your effort. yes, my first question was closed in a way that there was not a problem and there is no solution for it. while it was an actual problem I encounter here and I finally could find a solution which may helps many with this situation. in the first one it was an odd problem since I couldn't post more than few bytes (there are many similar problems with large data but no one as little bytes as this) and I explained it well. as it was closed it made me reluctant to write all them again and I asked about retransmission error which I guessed the cause. anyway tx