Super simple round-robin router implemented in a function node

[Steve-Mcl]

If you are using MQTT you can also achieve this for free using shared topics.

Redundant node-red instances plugged on AWS IOT CORE

In pretty sure you can use mqtt shared subscriptions anywhere with v5 mqtt broker. Just give it a go. Node-red 1 Subscribe to $share/group1/test Node-red 2 Subscribe to $share/group1/test Node-red 3 Publish to test You should only get a message to one or the other.

MQTT Shared Subscriptions – MQTT 5 Essentials Part 7