home-assistant.io/source/_components/mqtt_eventstream.markdown
Fabian Affolter 2851b2a606
Update configuration samples (#5041)
* Update configuration samples

* Minor changes
2018-03-29 10:02:47 +02:00

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---
layout: page
title: "MQTT Eventstream"
description: "Instructions on how to setup MQTT eventstream within Home Assistant."
date: 2016-01-13 08:00
sidebar: true
comments: false
sharing: true
footer: true
logo: mqtt.png
ha_category: Other
ha_release: 0.11
ha_iot_class: depends
---
The `mqtt_eventstream` component connects two Home Assistant instances via MQTT.
## {% linkable_title Configuration %}
To integrate MQTT Eventstream into Home Assistant, add the following section to your `configuration.yaml` file:
```yaml
# Example configuration.yaml entry
mqtt_eventstream:
publish_topic: MyServerName
subscribe_topic: OtherHaServerName
```
{% configuration %}
publish_topic:
description: Topic for publishing local events.
required: false
type: string
subscribe_topic:
description: Topic to receive events from the remote server.
required: false
type: string
ignore_event:
description: Ignore sending these [events](/docs/configuration/events/) over mqtt.
required: false
type: list
{% endconfiguration %}
## {% linkable_title Multiple Instances %}
Events from multiple instances can be aggregated to a single master instance by subscribing to a wildcard topic from the master instance.
```yaml
# Example master instance configuration.yaml entry
mqtt_eventstream:
publish_topic: master/topic
subscribe_topic: slaves/#
ignore_event:
- call_service
- state_changed
```
For a multiple instance setup, each slave would publish to their own topic.
```yaml
# Example slave instance configuration.yaml entry
mqtt_eventstream:
publish_topic: slaves/upstairs
subscribe_topic: master/topic
```
```yaml
# Example slave instance configuration.yaml entry
mqtt_eventstream:
publish_topic: slaves/downstairs
subscribe_topic: master/topic
```