I plan to deploy several raspberries with node red and an MQTT broker to monitor in a "PCVUE" hypervisor.
Each site has a 4-digit number in a text file in /home/pi/Documents/sitenumber.txt .
My node-red has a lot of in or out topics, I would like to be able to modify all the topics by modifying the text file.
example topic: /site n°/bedroom/temp
Thank you for your help