node-red-node-serialport message duplication

[mima232]

Which node are you reporting an issue on?

node-red-node-serialport serial control node

What are the steps to reproduce?

Just send enable two or more times to control node

What happens?

All serial nodes that have output and are configured for the same port will emit multiple same messages according to number of issued enables

What do you expect to happen?

I expect to emit the unique message only one time

I've tried it with usb serial and with native rs232, both same behaviour.

• Node-RED version: 3.1.9
• node.js version: 20.13.1
• npm version: 10.5.2
• Platform/OS: Ubuntu 24.04 LTS
• Browser: Chrome