https://stackoverflow.com/q/46556167

arch0.dot

digraph {
    bgcolor=transparent;
    splines=polyline;
    phone0[label="Smartphone 0"];
    phone1[label="Smartphone 1"];
    phone2[label="Smartphone 2"];
    laptop0[label="Laptop 0"];
    laptop0[label="Laptop 1"];
    laptop0[label="Laptop 2"];
    server0[label="Server (DB, API, nginx, static files)", shape=cylinder]
    router[label="WiFI router & switch", shape=rectangle];

    laptop0->router [dir=none];
    laptop1->router [dir=none];
    laptop2->router [dir=none];
    laptop3->router [dir=none];
    phone0->router [dir=none];
    phone1->router [dir=none];
    phone2->router [dir=none];
    server0->router [dir=none];
}