串口通讯

Question

I'm developing a software that lets you manage the serial-port communication in an easier way, through a C++ wrapper class. But I've run into some doubts; for example, I wanna show a simple message on the other screen:

1)There is the need of a "listening server" (and then set it up)? Or it gets written directly, like this example:

#include <fcntl.h>
#include <unistd.h>
int main()
{
  int fd = open("/dev/tty2", O_RDWR);
  write(fd, "Hello World", sizeof("Hello World"));
  return 0;
}

(just to show the behavior)
2) I run the program on the sender computer. On the second one, what I've to do? The two machines run Linux both. Please give me as much information as you can, I've never treated this (old) communication style.

Edit: In every program I've found so far, both the read and write are in the same program. I'd know why.

Answer 1

Personally tested, yes, you've to set a listener and a writer program. Kind of client-server, I'd say.

Answer 2

Often sending and receiving are implemented in one program. So you have the same program on both machines even if you send always from the same machine and receive on the other. If you want to communicate both ways you need sending and receiving in the same application. But then you need a synchronization mechanism.