MQTT Publish Activity
The MQTT Publish activity publishes a message to a broker, which supports and exposes the MQTT protocol.
Settings
The Settings tab has the following fields:
| Field | Description |
|---|---|
| Connection | Name of the connection |
| Topic | The topic where the message is published |
| Retain | You must enable this field to retain the last message for new subscribers |
| QoS | The quality of service is set to 0, 1, or 2 |
| Value Deserializer | Establish the way the message body is treated |
| Value Deserializer:String | The activity input accepts a simple string. The string is sent as an array of bytes to the server. |
| Value Deserializer:JSON | An Input Settings field is enabled where the application designer can enter a JSON object. That object is presented on the input schema for mapping and at run time the object is deserialized and sent as bytes. A subscriber can use the same JSON object definition to deserialize the message. |
| Value Deserializer:Base64 | The activity accepts string data which is base64 decoded into a byte array before being sent to the broker. If a previous activity presents a byte array on its output, it is safe to map that value here. |
Input Settings
The Input Settings tab is visible if the deserializer is set to JSON on the Settings tab. An example of a JSON object is entered in this field which can be used to compose the input schema.
The Input Settings tab has the following field:
Loop
If you want this activity to iterate multiple times within the flow, enter an expression that evaluates to the iteration details. Select a type of iteration from the Type menu. The default type is None, which means the activity does not iterate. For more information, refer to the "Using the Loop Feature in an Activity" topic in the TIBCO Flogo® Enterprise documentation.