For reference, @ChZeman raised an issue here: Populate Vartable from Environment Variables · Issue #36 · st-one-io/node-red-contrib-cip-ethernet-ip · GitHub
In the MQTT nodes, we permit the user to uncheck "Auto Connect" in the config node and permit the user to send a the string "connect" or "disconnect" in msg.action to any regular MQTT node. Additionally, the MQTT node permits dynamic subscriptions by sending "subscribe" or "unsubscribe" in the msg.action - along with the topic to subscribe in msg.topic
I suspect this node requires something similar. Perhaps you could mention something like this as a feature request in the issue. OR fork the node, add the feature and raise a PR back to the original node.
