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---
title: Receive Message
hide_title: true
---
<##head##>
# Receive Message
**Receive Message** nodes are used to receive messages sent over MQTT, by a [**Send Message**](/library/modules/mqtt/send-message) node for example. Messages can be sent across devices and
be used for inter-device communication and IoT. The **Receive Message** node subscribes to an MQTT topic and receives any message and payload published to that topic.
![](/library/modules/mqtt/receive-message.png)
<##head##>
<div class = "node-inputs">
## Inputs
### Other
**Topic**
The topic name can be any identifier and is used by the **Receive Message** nodes to connect sender and receiver nodes, or publishers and subscribers in MQTT. Most commonly the topics are specified as a hierarchy with **/** as delimiters, e.g. _/Foo/Bar/1_. Sometimes the topics need to be dynamic, this can be achieved by encapsulating a topic component with curly brackets, e.g. _/Foo/{Bar}/1_. In this case a port called _Bar_ will show up.
Topics on _Receive Message_ can also be specified with wildcards, so for instance _/Foo/+/Bar_ will subscribe to both _/Foo/Hello/Bar_ and _/Foo/Goodbye/Bar_.
The exact topic component used when sending the message can be retrieved in a similar way to dynamic topics, by specifying _/Foo/+X+/Bar_ an output port called _X_ will
be created that will hold the value of the topic component when the message is received.
**Enabled**
Enable and disable the **Receive Message** node.
</div>
<div class = "node-outputs">
## Outputs
### PAYLOAD
**Receive Message** nodes can have arbitrary output ports, payloads, that will assume the value of any incoming messages, for example a [Send Message](/library/modules/mqtt/send-message) node. These ports are referred to as payload ports.
These ports can be added by inspecting the node and clicking the _Add port_ button in the _Payload_ section.
**Received**
A signal triggered when a message is received.
</div>
[0]: ./send-message