Node.js-Unity游戏Socket重连后反复断开问题求助

Hey, I’ve dealt with similar Socket connection loop issues between Unity and Node.js before, so let’s walk through the most likely fixes based on your setup:

1. Address Node.js v6.11.0’s Socket Compatibility Quirks #

Node.js v6.x is pretty outdated, and it has some differences in Socket behavior compared to newer versions that could trigger unexpected disconnections:

• Enable keep-alive on the server: When creating your Socket server, add the keepAlive and keepAliveInitialDelay options to prevent idle connections from being dropped prematurely:

  const server = net.createServer({
    keepAlive: true,
    keepAliveInitialDelay: 30000 // Send keep-alive probe after 30s of idle
  }, (socket) => {
    // Your connection handling logic
  });
  

• Adjust server timeout settings: Check if server.timeout is set too low (the default might be aggressive in v6.x). Try increasing it to 60 seconds or more:

  server.timeout = 60000; // 60 seconds
  

2. Debug Unity’s Reconnection Logic #

Since your web client works fine, the issue is likely tied to how Unity handles connections and disconnections:

• Add a delay between reconnection attempts: If Unity immediately tries to reconnect right after disconnecting, the server might not have finished cleaning up the previous connection, leading to a loop. Use a coroutine or Invoke to add a 1-2 second delay:

  IEnumerator ReconnectAfterDelay()
  {
      yield return new WaitForSeconds(2f);
      // Your reconnection code here
  }
  

• Log detailed error messages: In Unity’s OnDisconnected or OnError callbacks, print the exact error reason (if available). This will tell you if the disconnect is triggered by a data parsing error, server-side rejection, or network issue.

3. Rule Out Port-Related System Configs #

Even if you’ve checked the port itself, hidden system rules might be interfering with 3012:

• Verify firewall settings: Some firewalls treat new ports differently and might throttle or block connections. Temporarily disable your firewall (for testing only) or add a specific allow rule for port 3012.
• Double-check server binding IP: Ensure your Node.js server is binding to 0.0.0.0 (allowing all incoming connections) instead of 127.0.0.1 (local-only). A wrong binding could cause Unity (if running on a different device/network) to drop connections, while the web client (local) works fine.

4. Fix Data Format Mismatches Between Unity and Server #

Web clients and Unity often handle data encoding differently, which can cause the server to crash or disconnect Unity:

• Match encoding standards: Confirm both Unity and the Node.js server use the same encoding (e.g., UTF-8) for sending/receiving data. In Unity, use Encoding.UTF8 when converting strings to bytes, and on the server use socket.setEncoding('utf8').
• Ensure proper packet framing: If you’re sending multiple data chunks, use a clear delimiter (like a newline \n) or fixed-length headers to mark packet boundaries. A missing delimiter can cause the server to wait for incomplete data, eventually timing out and disconnecting Unity.

内容的提问来源于stack exchange，提问作者paradox