I’ve recently needed to change the IP address of my Docker HA install, along with my Matter Server. After performing the change I noticed that the Matter (BETA) integration was unable to start. After some less than fruitful digging around, I discovered that the IP address of the Matter Server is not exposed in the HA browser GUI or from any high-level config files. It is only set once when the integration is added, with no way to subsequently change it.
I eventually found the config line, deep inside config/.storage/core.config_entries and updated the Matter Server integration IP address manually inside this file. Everything began working again after that.
This is primarily an informational post to help others on this same quest line. But my question to the development team is whether this was the intended resolution? If so, could it be specifically added to the documentation, and if not, could the approved method be documented?