And about the timestamp it's because I'm capturing packets ending with CRLR. I hope to take each packet putting a timestamp, but if inside the packet I have a CR or LR isolated, the timestamp come too. I got this result in the screen of the terminal using timestamp with idle option of the display tab, but I don't have this option on capture tab to achive the goal on the file too.
Options for timestamp trigger on capture tab and CRLF parameter for second box of send tab