Home Assistant MQTT → Slack Bridge

Home Assistant for the home. Nodlyn for edge workflows. This bridge keeps your HA MQTT topics and adds visual alerts, Dry-Run, and (later) industrial or document steps on the same canvas.

What this template does

1. HA / Z2M MQTT — subscribes to zigbee2mqtt/# by default (typical HA + Zigbee2MQTT stack). Switch to homeassistant/# for HA MQTT Statestream/discovery.
2. Notify Slack — posts topic + payload to #ha-bridge (placeholders {{topic}} / {{payload}} are resolved at run time).

Step 1 — Share one broker

1. Confirm HA (or Zigbee2MQTT) publishes to the same broker Nodlyn will use (often localhost:1883 on a Pi or NAS).
2. If the broker requires auth, note username/password for Studio.

Step 2 — Load template #262

1. Open Studio → Templates (or empty-canvas recipe When HA / Zigbee publishes…).
2. Search Home Assistant MQTT and load template #262.

Step 3 — Topic filter

1. Default topic zigbee2mqtt/# — narrow to a device (e.g. zigbee2mqtt/living_room) once traffic looks right. For HA Statestream use homeassistant/#.
2. Set broker host/credentials on the MQTT trigger node.

Step 4 — Slack + Dry-Run

1. Paste a Slack incoming webhook URL; adjust channel/message.
2. Use 🧪 Dry-Run first, then Activate on-prem. Watch the Live strip and Activity tab.

Why not “replace HA”?

Nodlyn is the workflow layer next to HA: approvals, PLC/Modbus, invoices, and exportable runtime agents. Keep HA for Lovelace and home entities; bridge the events you care about into Nodlyn.

Related

• MQTT Device Event → Slack (#132) — generic MQTT notify.
• ESPHome / Zigbee2MQTT in Studio in 15 min.
• Blog: MQTT publish/subscribe & HA topics.