Send data through Tulip, by sending the data from Edge to Tulip β using Tulip to send to your device, ie through a connector (caveat, this is very inefficient)
As you suspected, you could use Node-RED, this article should be able to help How to: Use Serial with Node-RED. A note here: hot-plugging isnβt supported (device must be plugged in when node-red starts for it to show up)