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Smart Home with MQTT

Many smart home and IoT devices support the communication protocol MQTT and can be configured to connect to an arbitrary MQTT broker on the internet. That broker can be your Portal.

This allows you to monitor and control your IoT devices from anywhere and from any device you have paired. It also provides a privacy-preserving way of consolidating your IoT devices which is important if they manage sensitive data. You can even create automation rules that act on the data.

This guide covers installation and first steps for setting up your Portal.


The MQTT broker that Portal supports is Eclipse Mosquitto. Install it from the app store.

Also install Cedalo Management Center which allows you to create and manage MQTT clients, their credentials and permissions.

If you want to test and monitor the raw data that flows through Mosquitto, you can install MQTTX as well.

Screenshot of installed apps

Creating Clients and Permissions

Open Cedalo Management Center and login with admin:admin. (This is necessary because the app does not yet support the required authentication methods needed for Portal.) You are greeted with a dashboard that shows you the state of your Mosquitto broker.

Navigate to clients and create a new client. Give it a name and a password. You will use this client for a first test. Later, it is advised to create a separate client for each IoT device or service you connect.

Screenshot of Cedalo clients Screenshot of new client

Next, navigate to roles and create a new role and give it a name. A role contains a set of permissions and can be assigned to clients. This allows the clients to do the things that the assigned role permits them. So on the tab ACLs, add some permissions like seen in the screenshot.

Screenshot of Cedalo roles Screenshot of new role Screenshot of a role's ACL

Lastly, go back to clients and assign the newly created role to the client. Now, the client is allowed to do all the things that were configured in the role.

Screenshot of a role's assignment

For more information about configuring access control, see the Cedalo docs and the Mosquitto docs.


You can now test the broker and its settings. One way is by using the MQTTX app. Install it from the app store if you have not already done so and open it.

Screenshot of MQTTX welcome screen

Create a new connection and enter the connection details as shown on the screenshot. Replace the host with the URL of your Mosquitto app which is mosquitto.<id> Then click connect to establish a connection with your broker.

Screenshot of MQTTX connection settings

Why port 443?

We are using port 443 because MQTTX only supports connections using MQTT over websocket. The normal MQTT port is usually 8883. Mosquitto offers both variants.

In order to test the connection, subscribe to the broker using a second client, e.g. the mosquitto_sub cli tool. For this test, you can subscribe using the same client credentials that you used with MQTTX. See the screenshot for an example command.

Screenshot of message reception with mosquitto_sub

Now, send a message from MQTTX to some topic and watch mosquitto_sub receive it.

Screenshot of MQTTX message sending

Automating your Home with Node Red

The Node Red app allows you to easily write workflow automations like switching devices based on sensor data. It can connect to the Mosquitto app and consume messages (e.g. from sensors or switches) and produce messages (e.g. to send commands to lights, power outlets, etc.).

Screenshot of a Node Red flow using MQTT

Node Red offers two kinds MQTT nodes, one for sending, one for receiving. When you use them, they require you to configure a MQTT server. You need to do this only once and can reuse the same server on all MQTT nodes.

But before you begin, you should create a unique client and password for Node Red using Cedalo Management Center. See above on how to do this. Give it the desired permissions, most probably the same as described above.

Then add a MQTT node to your flow and configure it.

Screenshot of the configuration of a MQTT out node

Set up the server. The server name is simply mosquitto, the port is 1883.

Screenshot of the configuration of a MQTT server

Also enter the credentials you created before.

Screenshot of the credential configuration of a MQTT server

Now, you can use this server to receive and send messages to create powerful automations. Search for node-red examples for some inspiration.

Monitoring and Controlling with Home Assistant

Home Assistant is a flexible and powerful tool to manage and automate the devices in your home. It allows you to create dashboards, automations, alerts and much more. You can install it from the Portal app store.

Screenshot of the Home-Assistant app in the store

When first opening Home Assistant, you must create an account. Pick a secure password: other than most Portal apps, the web interface is public. This allows you to create accounts for other members of your household, too.

Screenshot of the Home-Assistant registration view

After registration, follow the setup assistant.

Screenshot of the Home-Assistant setup view Screenshot of the Home-Assistant telemetry selection view

It is normal that no devices are listed here. If you install home assistant on your own hardware inside your home network, you would see all devices that are present. But Portal is not in your home network so this list is empty.

Screenshot of the Home-Assistant device selection view

In order to establish a channel to your MQTT-enabled devices, we need to connect home assistant to your Portals MQTT broker. Navigate to Settings > Devices & Services.

Screenshot of the Home-Assistant settings view

Search for and select the MQTT option.

Screenshot of the Home-Assistant mqtt selection

Like with Node-Red, the broker is simply mosquitto and the port is 1883. It is good security practice to create dedicated client credentials for home assistant. Use Cedalo management center as outlined above to do that.

Screenshot of the Home-Assistant mqtt configuration view

You can test the connection in a similar way as before. Use MQTTX or any other client to send and receive messages to and from home assistant.

Screenshot of the Home-Assistant mqtt testing scenario

Next Steps

The next step is to connect smart home devices and monitor, control, and automate them.

As mentioned earlier, it is recommended to create a separate client for each device using the Cedalo Management Center and give it the minimal permissions it needs. Then, point the devices to mosquitto.<id> using either the MQTT protocol on port 8883 or MQTT over websocket on port 443.

The smart home journey on Portal is just beginning, and we plan on adding more apps and functions in the future. We would love to hear about your experiences, the dashboards and automations you build and the kind of devices you connect. Also, if you have ideas or wishes for further development, let us know at our Discord server or using our feedback platform.