edge_write
status = edge_write(tty, port, &stop_char, 1);
status = edge_write(tty, port, &start_char, 1);
.write = edge_write,
.write = edge_write,
.write = edge_write,
.write = edge_write,
status = edge_write(tty, port, &stop_char, 1);
status = edge_write(tty, port, &start_char, 1);
.write = edge_write,
.write = edge_write,