---
title: Listen to MQTT
description: You can reach the listener using an instance of a Client.TopicSubscriber object that is returned from the Client.subscriber() function.
image: /img/logo/iota_mark_light.png
keywords:
- how to
- message
- message queuing telemetry
- queues
- asynchronous events listener
- list topics
- nodejs
- java
- nodejs
- python
- wasm
- rust
---
import Tabs from "@theme/Tabs";
import TabItem from "@theme/TabItem";

import KeyConceptOutputs from '../_admonitions/_explanation_outputs.md';
import Javamqtt from "../libraries/java/examples/_10_mqtt.mdx";
import Nodejsmqtt from "../libraries/nodejs/examples/_10_mqtt.mdx";
import Pythonmqtt from "../libraries/python/examples/_10_mqtt.mdx";
import Rustmqtt from "../libraries/rust/examples/_10_mqtt.mdx";
// import Wasmmqtt from "../libraries/wasm/examples/_10_mqtt.mdx";


<KeyConceptOutputs />

IOTA node(s) provide a [Message Queuing Telemetry Transport](https://en.wikipedia.org/wiki/MQTT) (MQTT) layer, if
enabled, which is a lightweight publish-subscribe network protocol that provides information about events that are
being triggered by the IOTA network.

The `iota.rs` client library supports asynchronous event listeners that can be listened to, and continuously receive
MQTT events based on a `topic`, which can be:

* milestones/latest
* milestones/confirmed
* messages
* messages/referenced
* messages/indexation/{index}
* messages/{messageId}/metadata
* transactions/{transactionId}/included-message
* outputs/{outputId}
* addresses/{address}/outputs
* addresses/ed25519/{address}/outputs


<Tabs groupId="language">
  <TabItem value="java" label="Java">
    <Javamqtt />
  </TabItem>
  <TabItem value="nodejs" label="Nodejs">
    <Nodejsmqtt />
  </TabItem>
  <TabItem value="python" label="Python">
    <Pythonmqtt />
  </TabItem>
  <TabItem value="rust" label="Rust">
    <Rustmqtt />
  </TabItem>
</Tabs>