Method _handleUdpResponse

src/network.js:138–155

* Handle UDP response from main thread * @private

(msg)

     * @private
     */
    _handleUdpResponse(msg) {
        const { data, srcIP, srcPort, dstIP, dstPort } = msg;
        
        // Build UDP response packet
        const udpHeader = Buffer.alloc(8);
        udpHeader.writeUInt16BE(dstPort, 0); // src port (from external server)
        udpHeader.writeUInt16BE(srcPort, 2); // dst port (back to VM)
        udpHeader.writeUInt16BE(8 + data.length, 4); // length
        udpHeader.writeUInt16BE(0, 6); // checksum (optional)
        
        const payload = Buffer.concat([udpHeader, Buffer.from(data)]);
        
        // Send IP packet back to VM
        const dstIPBuf = Buffer.from(dstIP.split('.').map(Number));
        const srcIPBuf = Buffer.from(srcIP.split('.').map(Number));
        
        this.sendIP(payload, IP_PROTO_UDP, dstIPBuf, srcIPBuf);
    }
    
    /**
     * Handle TCP connected event from main thread