syryn 0.1.9

Bluetooth identity beacon for headless Linux devices — returns hostname, mDNS, and active network interfaces over RFCOMM.

syryn

Bluetooth identity beacon for headless Linux devices.

The name comes from Сирин — a bird from Slavic mythology known for its voice. Syryn speaks when asked: it listens on a Bluetooth RFCOMM channel and responds with the device's hostname, mDNS address, and active network interfaces.

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What it does

Run syryn on a headless mini-PC. From any nearby Bluetooth device, send STATUS — and get back:

hostname: panteon-john
mdns: panteon-john.local
eth0: 192.168.0.131
wlan0: 192.168.1.44
external_ip: 93.12.34.56

No display needed. No SSH session. No prior knowledge of the IP address.

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Install & quick start

1. System packages (one-time)

syryn uses the BlueZ D-Bus API directly — no PyBluez2 required.

Debian / Ubuntu / Xubuntu:

sudo apt install bluez python3-dbus python3-gi

Fedora / RHEL:

sudo dnf install bluez python3-dbus python3-gobject

2. Enable Bluetooth

sudo systemctl enable bluetooth --now   # start and enable on boot

rfkill list                             # check if adapter is blocked
sudo rfkill unblock bluetooth           # unblock if needed

bluetoothctl discoverable on            # make device visible

To keep the device permanently discoverable, add DiscoverableTimeout = 0 to /etc/bluetooth/main.conf and restart bluetooth.service.

3. Install syryn

syryn uses system D-Bus libraries. Install with --system-site-packages so pipx can find them:

pipx install syryn --system-site-packages

Or without pipx:

pip install syryn

4. Run

syryn               # auto-pairing, no PIN
syryn --pin 1234    # hardcoded PIN for all incoming pairs
syryn -q            # quiet mode, no log output

Syryn registers a Serial Port Profile (SPP) via BlueZ and a pairing agent so connecting devices are accepted automatically (no manual PIN prompt). The device name visible to other devices is the system hostname (set via hostnamectl set-hostname <name>).

5. Connect from another device

From any device with a Bluetooth terminal app (e.g. Serial Bluetooth Terminal on Android):

1. Scan for Bluetooth devices — the headless device appears by hostname
2. Pair (accepted automatically by syryn)
3. Connect to the Syryn service (Serial Port)
4. Send STATUS — receive hostname, mDNS, interfaces, external IP

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Requirements

• Linux with BlueZ (bluetoothd running)
• Python 3.10+
• python3-dbus + python3-gi (system packages) — BlueZ D-Bus interface and pairing agent
• psutil, requests (installed automatically via pip)

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Part of the SIMARGL toolkit

syryn is one of seven tools that together form an intellectual development support system:

Tool	Role
simargl	Task-to-code retrieval — given a task description, finds which files and modules are likely affected, using semantic similarity over git history
svitovyd	Project map — scans any codebase and produces a structural map of definitions and cross-file dependencies; exposes it as an MCP server
1bcoder	AI coding assistant for small local models — surgical context management, agents, parallel inference, proc scripts
yasna	Session memory — indexes conversations from all AI agents so you can find what was discussed, when, and where
radogast	Context drift monitor — measures how far an AI agent's conversation has drifted from the original task
vyrii	Local AI web UI — chat, translate, web research, RAG, and file management via Gradio; powered by Ollama or any OpenAI-compatible backend
syryn	Bluetooth identity beacon — returns hostname, mDNS, and active network interfaces for headless devices

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(c) 2026 Stanislav Zholobetskyi, Oleh Andriichuk Institute for Information Recording, National Academy of Sciences of Ukraine, Kyiv PhD research: «Intelligent Technology for Software Development and Maintenance Support»