Serialfd Com Top !!install!! -

int open_serial_top(const char *device) int fd = open(device, O_RDWR

Factories running 30-year-old PLCs (Programmable Logic Controllers) use Serialfd to convert those RS-485 signals into REST APIs. The "top" configuration ensures the old PLC isn't starved of requests, maintaining cycle times. serialfd com top

struct timeval timeout = 1, 0; // 1 sec timeout int ret = select(serial_fd + 1, &read_fds, NULL, NULL, &timeout); if (ret > 0 && FD_ISSET(serial_fd, &read_fds)) char buf[4096]; int n = read(serial_fd, buf, sizeof(buf)); // process data if (ret &gt