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ok so how should I redesign my example? anyway the protocol I was given is like that pack eny user msg into 2, msg, 3, checksum ->server respond in 2 sek send 6 if something goes wrong send 21. all that numbers are from ascii table STX ETX ACK and NAK. so yes is is kind of reinventing the wheel but.... -- pozdrawiam Paweł Kamiński