docs: add parrot documentation and reference in README

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+!docs/PARROT.md
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 # -----------------------------------------------------------------------------

README.md

@@ -28,3 +28,14 @@ Options:
 python adn-server.py -c /path/to/adn-server.yaml
 python adn-server.py --logging DEBUG
 ```
+
+## Parrot (Playback)
+
+A separate entrypoint records incoming group voice and plays it back (echo/parrot).
+
+```bash
+cp adn-parrot.example.yaml adn-parrot.yaml
+python adn-parrot.py
+```
+
+See [docs/PARROT.md](docs/PARROT.md) for architecture, configuration and systemd setup.

docs/PARROT.md

@@ -0,0 +1,135 @@
+# ADN Parrot (Playback)
+
+Exact port of the legacy `playback.py` to clean architecture.
+Records incoming group voice calls and plays them back to the sender.
+
+## Architecture
+
+```
+Hotspot ──► adn-server (MASTER :56400)
+                │
+                ├── bridge routes TG 9990 to ECHO
+                │
+                └── ECHO (PEER :54917) ──► adn-parrot (MASTER :54915)
+                                                  │
+                                                  ├── records DMRD packets
+                                                  ├── waits 2 s
+                                                  └── plays back with new stream ID
+```
+
+The parrot runs a **MASTER** system. The `ECHO` **PEER** (defined in `adn-server.yaml`)
+connects to it. When a user transmits to TG 9990, the bridge forwards the call to
+the ECHO peer, which relays it to the parrot master. The parrot records all packets,
+then replays them back through the same path.
+
+## Files
+
+| File | Description |
+|---|---|
+| `adn-parrot.py` | Launcher script (like `adn-server.py`) |
+| `adn-parrot.example.yaml` | Example config (copy to `adn-parrot.yaml`) |
+| `src/adn_server/parrot_main.py` | Entrypoint: config loading, protocol setup, reactor |
+| `src/adn_server/application/playback_use_cases.py` | Recording/playback logic (port of `playback.py`) |
+
+## Configuration
+
+Copy the example and set your passphrase:
+
+```bash
+cp adn-parrot.example.yaml adn-parrot.yaml
+```
+
+The config defines a single MASTER system (`PARROT`) that listens on `127.0.0.1:54915`.
+The passphrase must match the one used by the ECHO peer in `adn-server.yaml`.
+
+Key settings:
+
+```yaml
+SYSTEMS:
+  PARROT:
+    MODE: MASTER
+    PORT: 54915            # must match ECHO.MASTER_PORT in adn-server.yaml
+    PASSPHRASE: passw0rd   # must match ECHO.PASSPHRASE in adn-server.yaml
+    MAX_PEERS: 1
+    ALLOW_UNREG_ID: true
+```
+
+## Running
+
+```bash
+# Direct
+python adn-parrot.py
+python adn-parrot.py -c /path/to/adn-parrot.yaml
+python adn-parrot.py --logging DEBUG
+
+# systemd
+sudo systemctl start adn-parrot
+sudo systemctl enable adn-parrot
+```
+
+### systemd service
+
+Create `/etc/systemd/system/adn-parrot.service`:
+
+```ini
+[Unit]
+Description=ADN DMR Parrot (playback)
+After=multi-user.target adn-server.service
+
+[Service]
+User=root
+Type=simple
+Restart=always
+RestartSec=3
+SyslogIdentifier=adn-parrot
+WorkingDirectory=/opt/new-adn-server
+ExecStart=/usr/bin/python3 /opt/adn-server/adn-parrot.py -c /opt/adn-server/adn-parrot.yaml
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Then:
+
+```bash
+sudo systemctl daemon-reload
+sudo systemctl enable --now adn-parrot
+```
+
+## Playback flow
+
+1. ECHO peer receives DMRD from master, forwards to parrot
+2. Parrot detects new `stream_id` → starts recording
+3. Parrot receives voice terminator → stops recording
+4. Waits 2 seconds
+5. Generates new `stream_id`, replays all packets with `sleep(0.06)` between each
+6. ECHO peer receives playback, master repeats to hotspot
+
+## Compatibility
+
+The parrot uses the standard HBP protocol. Any legacy `playback.py` instance running
+on another server can connect to our MASTER systems, and our ECHO peer can connect to
+any legacy parrot master. The protocol is identical.
+
+## Logs
+
+Default log file: `/var/log/adn-server/parrot.log`
+
+Successful startup looks like:
+
+```
+INFO  ADN Parrot -- SYSTEM STARTING...
+DEBUG MASTER instance created: PARROT, <HBPProtocol ...>
+INFO  (PARROT) Repeater Logging in with Radio ID: 9990, 127.0.0.1:54917
+INFO  (PARROT) Peer 9990 has completed the login exchange successfully
+INFO  (PARROT) Peer b'ECHO    ' (9990) has sent repeater configuration
+```
+
+Recording/playback:
+
+```
+INFO  (PARROT) *START RECORDING* STREAM ID: 12345 SUB: 7301001 TGID 9990, TS 2
+INFO  (PARROT) *END   RECORDING* STREAM ID: 12345
+INFO  (PARROT) *START  PLAYBACK* STREAM ID: 67890 Duration: 3.2
+INFO  (PARROT) *END    PLAYBACK* STREAM ID: 67890
+```