Hi Colin,
Just to give you some precisions.
I don't really have problems to store MQTT credentials. I can store them in flows_cred.json and after restarting nodered my credentials exist.
I just try to find another way to persist my credentials whithout using flows_cred.json.
I will have several customers and I don't want to share some informations in flows_cred.json. Even if this file can be crypted. And I don't want to manage a file per customer.
The idea is (but I don't know if it's possible):
I start nodered.
I load the flow.
I set up user and password for mqtt broker in the node.
I deploy.
And that's all.
The problem: if nodered restarts, I will lost the setup.
Do you always need that I proceed with your recommandations to trace ?
