SEMS-on-device-server/server.js

import { createServer } from "node:http";
import next from "next";
import { Server } from "socket.io";
import { fork } from "node:child_process";

const dev = process.env.NODE_ENV !== "production";
const hostname = "0.0.0.0";
const port = 22110;
// when using middleware `hostname` and `port` must be provided below
const app = next({ dev, hostname, port });
const handler = app.getRequestHandler();

app.prepare().then(() => {
  const httpServer = createServer(handler);

  const io = new Server(httpServer);
  const forked = fork("./scanner.js");

  io.on("connection", (socket) => {
    console.log("[server][WebSocket]已连接");
    socket.emit("msg", "connected");

    // io.emit("msg", "io.emit");
    forked.send("start");

    socket.on("disconnect", () => {
      console.log("[server][WebSocket]已断开连接");
      forked.send("stop");
    });
  });

  // socket_global.emit("msg","socket_global")

  httpServer
    .once("error", (err) => {
      console.error(err);
      process.exit(1);
    })
    .listen(port, () => {
      console.log(`[server][服务器]已启用于 http://${hostname}:${port}`);
    });

  forked.on("message", (msg) => {
    console.log("[server][子进程]]收到数据", msg);
    io.emit("msg", msg);
  });

  //
});