What a MeshCore Room Server does, how it differs from a repeater, and what it takes to run one.
A Room Server is an infrastructure node role built around one job: holding onto recent channel messages so anyone who was out of range can catch up when they reconnect. Think of it as an off-grid bulletin board — no internet, no cell towers, no cloud service required.
Room Servers store the most recent messages on a channel — on the order of a few dozen per channel — and hand them over to any device that reconnects after being offline. That’s the core difference from a plain repeater: a repeater only relays what’s actively passing through, while a Room Server keeps a short-term memory of it. Message storage isn’t unlimited — older messages drop once the queue fills — and reliable syncing gets weaker the further out (multi-hop) a device is from the Room Server itself.
Room Servers can also relay traffic like a repeater (set repeater true in the CLI), but turning that on trades away some message capacity and repeater-specific behavior. In practice, pick one primary job for a given node — pure message storage, or pure relay — rather than expecting full performance at both simultaneously.
A Room Server can broadcast its own Wi-Fi access point, letting devices connect directly instead of over LoRa — handy for a fixed location where people gather nearby. It can also bridge stored messages to an MQTT broker once internet connectivity is available, independent of the observer/broker setup described in Connect.
Like any MeshCore device, flashing starts at flasher.meshcore.io — pick the Room Server firmware variant for your board. Configuration (channel keys, Wi-Fi AP, MQTT bridging) happens through config.meshcore.io. Room Server firmware is functional but newer and less battle-tested than the Companion or Repeater roles, so expect some rough edges.
Power, solar sizing, and headless/remote management work the same way as for a repeater — a Room Server is just as often a fixed, unattended, solar-powered install.
Curious how this compares to a plain repeater? See Repeaters. Want the antenna side of a fixed install? See Antennas. Credit to mesh101.com for a genuinely useful deep-dive on Room Servers that this page draws on.