Node.js 在 NodeJSESP32 中通过 WebSocket 发送二进制数据 如何识别二进制和文本消息

I'm working on a CCTV camera with ESP32-Cam and NodeJS server. The way I want to do it is to use WebSocket client on the ESP and send binary data with captured frames to NodeJS server, which then will forward it to connected users. I can't use socket.io, so I'm using plain websockets (on node 'ws' module).
What I'm struggling about is that while sending binary data I can't tell what kind of message it is, meaning if it is stream, thumbnail, or a plain json message.

我的ESP32 Cam客户端代码(C++):

void liveCam(uint8_t num){
    //capture a frame
    camera_fb_t * fb = esp_camera_fb_get();
    if (!fb) {
        Serial.println("Frame buffer could not be acquired");
        return;
    }

    webSocket.sendBIN(num, fb->buf, fb->len);

    //return the frame buffer back to be reused
    esp_camera_fb_return(fb);
}

以及我在Node中的工作:

this.socket.on("connection", (ws) => {
            ws.on("message", (msg) => {
                // recognize channel of msg and process it (ArrayBuffer / JSON String)
            })
        })

要发送JSON，我将使用webSocket.ESP上的sendTXT(使用WebSocketsServer库)方法，只是我不知道how to handle both binary and text messages on the server，以及如何让服务器识别它们(类似于message tag，因此二进制流将是"stream"，而json将是"blink"或"fetch\u temp"，取决于使用情况).如果没有二进制流，我将只使用json，因此每个消息都有"tag"和"message"属性，但图像流会使事情复杂化.

I had an idea to send a json text message before binary message，这将为发送的下一条消息设置通道.只是不知道它是否可以工作，如果消息不同步，它是否会中断(这可能吗？).此外，我需要一个解决方案as fast as possible(为了保持视频的良好帧速率，现在清晰的二进制流真的很整洁！)

谢谢你的(好) idea 和解决方案！