# Bridge data to MQTT Broker

Setup anther MQTT broker using mosquitto, change the port to 2883. Taking Mac OSX for instance:

$ brew install mosquitto

$ vim /usr/local/etc/mosquitto/mosquitto.conf

port 2883

# start mosquitto
$ brew services start mosquitto
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Create a rule:

Go to EMQ X Dashboard (opens new window), select the "rule" tab on the menu to the left.

Select "message.publish", then type in the following SQL:

SELECT
    *
FROM
    "message.publish"
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Bind an action:

Click on the "+ Add" button under "Action Handler", and then select
"Data bridge to MQTT Broker" in the pop-up dialog window.
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Bind a resource to the action. Since the dropdown list "Resource" is empty for now, we create a new resource by clicking on the "New Resource" to the top right, and then select "MQTT Bridge":

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Configure the resource:

Set "Broker Address" to the address of mosquitto, here is
127.0.0.1:2883, and keep all other configs as default, and click on
the "Testing Connection" button to make sure the connection can be
created successfully, and then click on the "Create" button.
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Back to the "Actions" dialog, and then click on the "Confirm" button.

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Back to the creating rule page, then click on "Create" button. The rule we created will be show in the rule list:

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We have finished, testing the rule by sending an MQTT message to emqx:

Topic: "t/1"

QoS: 0

Retained: false

Payload: "Hello, World\!"
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Then verify a message has been published to mosquitto:

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And from the rule list, verify that the "Matched" column has increased to 1:

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