How to create a Matrix Room (former Mattermost Channel)

Helmholtz Matrix Documentation is WIP!

We plan to offer Helmholtz Matrix from April 2026. This first documentation is yet work in progress. Do not rely on it yet! Feel free to provide feedback if you encounter any errors.

Create a New Room

• to make sure you are in the right space click on the selected space on the left side. (If you need to create a space, see How-to create spaces.)
• click pencil symbol at the top
• choose # New room
• Enter Name, Topic
• choose who can see the room: Visible to spaces | Ask to join | Private Room | Public Room
  • You can find the description of the selected option below the field.
  • Ask to join option is only available via browser version or if you added app configuration, see How-to configure Element client
• Select whether the room should be encrypted (recommended, even required for confidential or data-protected chats).
• Show advanced:
  • If you select this option, you will not be able to chat with external partners (outside Helmholtz).
• Create room

Invite People

If you know the correct Matrix ID or the person is already part of the space

• open room
• click i on the header
• click invite
• enter name or matrix id in search
  • for matrix id, don’t forget the @ at the beginning, e.g. @name-ab3cd:helmholtz.cloud
• click invite
• the person is invited and can enter the room

If you do NOT know the Matrix ID of your channel members

• Make sure the room setting is Ask to join as described
• Copy Room Link
  • click i on the header
  • select Copy link
• Send the link to invite your room members
• Manage requests of people who shall join the room
  • click i on the header
  • click Settings
  • click People

Modify Default Settings

• click i on the header
• click Settings
• General:
  • modify Logo, Room Name, Topic
  • Room Addresses *and all following topics??
• People: Here, you manage requests of people who would like to join your room
• Security & Privacy:
  • Who can read history? Choose your prefered option.
• Roles & Permissions: You can manage authorisation level of the space users.
• Notifications:
• Polls: Overview of all polls in this Room.
• Advanced:

Move a Room to Another Space

You can move a room to another space:

• choose the destination space on the left side. This is the space where the room has to be later.
• click Add on the left side
• click # Add existing room
• select the room that you want to move
• click Add

Dictionary

Matrix	Mattermost
Space	Team
Room	Channel
People	Member