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docs(mixnet): drop README-fleet — chat_ui_mix app is self-contained
The published chat_ui_mix app ships with testnet creds and connects to the fleet automatically, so the bundle + CHAT_CREDS_DIR fleet runbook is obsolete. Repoint the sim README at the chat-ui 'Try it' instructions.
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Prem Chaitanya Prathi
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# E2E: logos-chat-ui over the live testnet-0.2 mix fleet
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Run `logos-chat-ui` clients against the **deployed testnet-0.2 mix fleet** (5 remote
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mix nodes) instead of the local sim. The client **discovers** the fleet's mix nodes
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(and their curve25519 pubkeys) via libp2p Kademlia service discovery — no node
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addresses or pubkeys are hardcoded.
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This is the fleet counterpart of [README.md](README.md) (the local 5-node sim). Key
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differences:
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- No local mix nodes to build or run — you dial the live fleet.
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- Credentials come from a **secret bundle** provided by the fleet operator (not
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`build_setup.sh`).
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- The client picks its RLN membership from an **in-app startup popup** (demo user
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1–10), and its libp2p peer-ID is **decoupled** from that membership.
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---
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## 0. Prerequisites
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- **Nix** with flakes enabled — the whole client chain is pulled from GitHub via
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`nix run`; nothing to clone or build by hand.
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- Network access to the fleet (`*.ih-eu-mda1.misc.vaclab.status.im`).
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- macOS or Linux.
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## 1. Get the credentials bundle 🔒
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The fleet uses **static RLN membership**. Obtain the credentials bundle from the
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fleet operator — a tarball containing:
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- `users/user1..user10/` — 10 demo-user RLN keystores,
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- `rln_tree.db` — the shared 15-member tree (5 fleet nodes + 10 demo users),
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- `fleet_bootstrap.txt` — the 5 fleet bootstrap multiaddrs.
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> ⚠️ **The bundle is secret — never commit it.** It holds per-user RLN keystores and
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> the shared tree, which together expose the fleet's entire RLN identity. Keep it
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> outside any git repo.
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Extract it somewhere local:
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```bash
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mkdir -p ~/fleet-creds && tar -xzf chat-app-credentials.tar.gz -C ~/fleet-creds
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export CHAT_CREDS_DIR=~/fleet-creds/chat-app-credentials
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```
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## 2. Run a client
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```bash
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export CHAT_CREDS_DIR=~/fleet-creds/chat-app-credentials # from step 1
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export CHAT_CLUSTER_ID=2
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export CHAT_SHARD_ID=0
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export CHAT_MIN_MIX_POOL=4
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export CHAT_MIX_REQUIRED=1
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export CHAT_PORT=0 # 0 = random (use distinct ports per client)
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# Receive path: filter-subscribe to one fleet node (any line from the bundle).
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export CHAT_STATIC_PEER="$(grep -m1 '^/dns4' "$CHAT_CREDS_DIR/fleet_bootstrap.txt")"
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nix run 'github:logos-co/logos-chat-ui?ref=feat/logos-testnetv02-mix' --accept-flake-config
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```
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The first run builds the whole chat chain from GitHub (slow once, cached after). The
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flake locks already pin the matching `logos-chat-module` / `logos-chat` revs — no
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overrides needed.
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## 3. Pick a membership in the startup popup
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On launch a popup asks which **demo user (1–10)** to use. Each maps to one RLN
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membership in the shared tree. Pick one and hit **Start**:
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- The app stages that user's keystore + the shared tree into its run dir, then
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mounts the mix protocol.
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- It **discovers** the 5 fleet mix nodes via kad (seeded from `fleet_bootstrap.txt`)
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— watch the bottom status bar fill to **`MIX 4/4`** (`mixReady`).
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- The node comes up immediately ("Connected"); mix discovery fills the pool in the
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background — the send button enables once the pool reaches the minimum.
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**Multiple testers / clients:** each picks a demo-user index. The peer-ID is
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**decoupled** from the membership (random nodekey per run), so two clients can pick
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the *same* index without a peer-ID collision. Use distinct `CHAT_PORT`s.
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## 4. Exchange messages
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1. In **Client A**: **My Bundle** → copy the intro bundle.
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2. In **Client B**: **+ new** → paste A's bundle + a first message → create.
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3. Send each way — messages route A↔B through the fleet mixnet.
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> ⚠️ **Known limitation (2026-06): 2-way messaging over the fleet is not delivering
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> yet.** Sends enter the mix but no SURB reply returns (the recipient receives
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> nothing). The client side is verified correct — discovery, RLN proof, and
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> credential handling all check out, and the client uses the bundle's `rln_tree.db`
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> which matches the tree deployed on the fleet. The issue is under investigation on
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> the **fleet routing** side. **Discovery + startup are fully testable today;
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> message delivery is not.**
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## Config reference
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| env | meaning |
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|-----|---------|
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| `CHAT_CREDS_DIR` | path to the extracted secret bundle (keystores + `rln_tree.db` + `fleet_bootstrap.txt`) |
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| `CHAT_STATIC_PEER` | a fleet node multiaddr to filter-subscribe to (receive path) |
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| `CHAT_CLUSTER_ID` / `CHAT_SHARD_ID` | `2` / `0` (must match the fleet) |
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| `CHAT_MIN_MIX_POOL` | min mix peers before send is allowed (default `4`) |
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| `CHAT_MIX_REQUIRED` | `1` = force Required (mix-only) mode |
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| `CHAT_PORT` | libp2p port (`0` = random; use distinct ports per client) |
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The demo-user index, fleet bootstrap list (`CHAT_KAD_BOOTSTRAP`), and the RLN
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keystore are all derived from the bundle + the popup selection at startup — you don't
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set them by hand.
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## How it differs from the sim runbook
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| | local sim ([README.md](README.md)) | live fleet (this doc) |
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|--|--|--|
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| mix nodes | 5 local — you build + run them | 5 remote — already deployed |
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| node addresses / pubkeys | hardcoded in `CHAT_MIX_NODES` | **discovered via kad** (`fleet_bootstrap.txt`) |
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| credentials | generated by `build_setup.sh` | **secret bundle** from the fleet operator |
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| membership selection | fixed `CHAT_NODEKEY` | **in-app popup** (demo user 1–10), peer-ID decoupled |
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@ -5,8 +5,9 @@ Run two `logos-chat-ui` clients that exchange end-to-end messages **through the
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This is a full from-scratch runbook: clone → build → provision → run → message.
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> Running against the **live testnet-0.2 mix fleet** instead of a local sim?
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> See [README-fleet.md](README-fleet.md).
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> Want the **live testnet-0.2 mix fleet** instead of a local sim? The published
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> `chat_ui_mix` app is **self-contained** (no setup) — see its
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> [README → Try it](https://github.com/logos-co/logos-chat-ui/tree/feat/logos-testnetv02-mix#try-it).
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The two clients adopt the **two provisioned chat memberships** the sim generates
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(peer-IDs `…1Qx…` and `…RABscN`), via `CHAT_NODEKEY`. RLN keystores are
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