node red is a stand alone program independent of openplotter or its version, it runs on the operating sys in our case raspian stretch, debian 9
there are two instances of node red you can use, the one in openplotter is the full or standard version and the one in signalk is an embedded version with special nodes for use with signalk they both work the same
there are links to beginner videos in the node red topic
here is a link to there forum
https://discourse.nodered.org/categories
mqtt is a messaging protocol it can run on windows linux apple arduino esp8266 esp32 android ect.
http://mqtt.org/documentation
its topic, message,.subscribe publish. so any number of device's using it can subscribe to a topic and get the message..or publish a topic with a message payload
there are two instances of node red you can use, the one in openplotter is the full or standard version and the one in signalk is an embedded version with special nodes for use with signalk they both work the same
there are links to beginner videos in the node red topic
here is a link to there forum
https://discourse.nodered.org/categories
mqtt is a messaging protocol it can run on windows linux apple arduino esp8266 esp32 android ect.
http://mqtt.org/documentation
its topic, message,.subscribe publish. so any number of device's using it can subscribe to a topic and get the message..or publish a topic with a message payload