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Hi, we are developing a TCP client application to control Watchout vie ethernet. We are using SocketTest to control that everything is correct. 1. Our TCP client can send only the first message. After that, Watchout doesn't send back anything. 2. SocketTest works perfectly, it sends as many message sa we want. 3. At the same time, if we turn ScoketTest to server, our TCP client sends to it as many message sa we want. We are investigating about message delimiter, it seems that Watchout uses CR in place of LF. We tried CR, LF and EOF, but we still have the same three situations. is there any more advice about TCP protocol? Thanks Paolo