A room server that quietly listens to one group channel — public or private, doesn't matter — and turns its messages into a post feed anyone can browse and catch up on later, with no admin sitting there relaying things by hand.
Whatever gets said on the channel becomes a post, verbatim, attributed to whoever sent it:
No channel-name prefix gets added — an Echo Board only ever mirrors one channel by design, so there's nothing to disambiguate, and the full post-length budget stays available for the message itself.
Needs the ESP‑NOW join configured first (same as any Sidecar — see the Sidecar setup page if you haven't done that yet), then one command:
set room.channel <name> <psk> get room.channel # read back current name + psk, or "(not set)"
psk is the channel's secret key — whatever your app shows on that channel's share/export screen. Either hex (32 or 64 characters) or base64 works, auto-detected, so it doesn't matter which format your app displays.
No. A private, invite-only channel works exactly the same way — the only requirement is that whoever configures the Echo Board knows that channel's PSK, same as joining it from any regular app.
Deliberate. It keeps the setup simple (no channel-name prefix needed, no ambiguity about which channel a post came from) and leaves the full post-length budget available for the actual message. Want to mirror more than one channel? Run more than one Echo Board.
Anyone who can log into the room server (as a guest or admin, however it's configured) can sync and read the post feed — no separate login for the mirrored channel itself.
Attaching this to a repeater for the first time?
Sidecar setup →