MQTT Topic Scope
The MQTT Topic Scope widget subscribes read-only to topic filters on an MQTT broker in your local network and shows their live values.
Publishing is deliberately unavailable. The widget can watch your broker; it cannot change anything on it.
What you’ll need
- The address of an MQTT broker on your LAN
- One or more topic filters
Enter them in the widget’s ⚙ panel.
Settings
| Setting | Notes |
|---|---|
| Broker host | e.g. mqtt.lan |
| Port | Defaults to 1883 |
| Use TLS | Off by default; turn on for a TLS listener (commonly 8883) |
| Username | Optional |
| Password | Optional — stored in Windows Credential Manager |
| Topic filters | One filter per line, up to 16 |
Topic filters
Filters use standard MQTT wildcards:
lab/temp— that exact topiclab/+/temp— single level, solab/attic/tempandlab/garage/templab/#— everything underlab/
The 16-filter cap is intentional: the subscription set stays bounded, so the widget can’t accidentally become a firehose against your broker.
Full step-by-step guide lands with the public beta.