Relay Binary

LetUsMsg relays are single static binaries — no external dependencies, minimal RAM, and designed to be ephemeral so you can recreate or rotate them quickly. Supported builds: Linux AMD64, Linux ARM64, macOS Intel, and macOS Apple Silicon.

Simple static binary (lum-relay)
Non‑root, zero data retention, zero disk writes
No database, No cloud services, No websockets, No API
Client -> relay protocol is HTTP/2 with mutual auth TLS (gRPC)

Download Relay

Download the file for you architecture, rename to ’lum-relay’, chmod 775, and execute

Download Linux AMD64 Download Linux ARM64 Download macOS Intel (AMD64) Download macOS Apple Silicon

Run relay service

lum-relay

Run in a self-documenting script with env variable (better security)

run-lum-relay.sh

#!/bin/bash
# local service IP:Port
export HOST=10.0.5.50
export PORT=19760
# Token to authenticate you are admin
# use this token to add a relay
export ADMIN_TOKEN=iv0zgm3ec291bd5odz0y5iw8
# IP:Port for the notification relay service
# The below IP:Port is a service provided by LetUsMsg Corp
# Note: notification relay service is optional, depending on your security requirements
export NOTIFY_HOST=dev.malloc.io
export NOTIFY_PORT=19769
# Auth token for notify relay service
# this value is for beta / demo purposes
export JWT_SECRET=test-secret-key-at-least-32-chars-long-for-security

./lum-relay start -v "$@"

lum-relay start

Command line example:

 
./lum-relay start  -s 10.0.5.50 -p 19760 -t iv0zgm3ec291bd5odz0y5iw8 -v

Previous Releases

Linux AMD64

Linux ARM64

macOS Intel

macOS Apple Silicon

Default Rotation and Lifetimes

Parameter	Default	Description
Relay TTL	7 days	Automatic rotation
Grace period	48 h	Overlap window for message pulls
Message TTL	72 h	Cache expiry
Cipher rounds	100 (default)	Configurable per channel

Own your infrastructure. Control your encryption. Leave nothing behind.