Port 4840
In live entertainment systems, port 4840 is used by OPC UA.
tcp/4840
OPC UA — OPC UA TCP binary protocol (opc.tcp://) default endpoint/discovery port
The OPC Foundation's platform-independent, service-oriented standard for structured, secured data exchange between industrial and building systems, from simple tag reads to full information models over TCP, UDP, WebSockets or MQTT/AMQP. In venues it is the practical bridge where show control needs to read or write into building management, HVAC or facility-automation systems.
Check it from the command line
npx showstack port 4840
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