jssc writebytes在linux上停止工作一段时间后

I'm programming in Java to talk with a device connected to a com-port (connected to the PC through USB, but by an RS232 to USB cable in between). I've written a program that talks with jssc and that functioned correctly under Windows, it kept working for a longer time even when nothing happens, like it should. Under Linux the program stops responding after a minute of 2 or 3 and I wonder why.I'm programming in Java to talk with a device c