🔹 Mosquitto User Authentication
🔹 Mosquitto Broker Terminal Test
🔹 Results
MQTT is a messaging protocol for TCP/IP networks. It is simple and light. Its basic architecture consists of broker and clients. The message exchange scheme is based on the Publish-Subscribe model.
Version 3.1.1 documentation: http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/mqtt-v3.1.1.html
Raspberry Pi is a series of small computers, which basically connects to a monitor, a keyboard and a mouse. There are several models, varying the available resources and performance. It is developed in the United Kingdom by the Raspberry Pi Foundation. In this application, Raspberry Pi 4 Model B with Raspbian operating system (based on Debian) was used.
Learn more at: https://www.raspberrypi.org/help/
Install the Mosquitto Broker that is available in the Debian archive, following what is described: https://mosquitto.org/blog/2013/01/mosquitto-debian-repository/
After installing the Mosquitto broker, install the Mosquitto Clients:
terminal commands
Install the Mosquitto Clients:
sudo apt install -y mosquitto-clients
Verify the status:
sudo systemctl status mosquitto.service
You will see "active running".
Stop the broker:
sudo stop mosquitto
Create a user configuration file:
sudo mosquitto_passwd -c /etc/mosquitto/pwfile username
Replace "user" with your username. When confirming, you will be asked for a password. Type a password and confirm.
Open the Mosquitto configuration file:
sudo nano /etc/mosquitto/mosquitto.conf
Comment (#) the last line "include_dir /etc/mosquitto/conf.d" And add the following lines:
password_file /etc/mosquitto/pwfile
allow_anonymous false
listener 1883
This will allow only devices with a name and password to access port 1883. Type Ctrl+X to exit and S to save.
Enable the service:
sudo systemctl enable mosquitto.service
Reboot the Raspberry Pi:
reboot
Open two terminals, one will be used for Subscribe and the other for Publish.
Do the following command on the first terminal:
mosquitto_sub -d -u username -P password -t topic/test.
This terminal will listen to the message that will come in the expected topic.
Now, do the command in the second terminal:
mosquitto_pub -d -u username -P password -t topic/test -m "Hello, Mosquitto!"
This terminal will publish the message in the configured topic.
If you got here, the broker is working correctly!!!
Follow the next steps to install and configure MQTT Dashbord on your Android device:
1- Search for mqtt dashboard in the Play Store and install. Version of the app used: 0.6.8 of 09/25/2020.
2- Add the broker.
3- Fill in according to the broker configuration. Important fields: Raspberry IP, broker username and password.
4- Now add the dashboard.
5- "Standard".
6- Add the buttons, configure them and then add "Text".
7- Configure the first button. Important fields: Publish topic and Payload (message).
8- Configure desired color and icon.
9- Now, to make it easier, duplicate the button.
10- Edit the color and name of the button. Do this for all buttons.
11- The time has come to add "Text". Important fields: Publish and subscribe topics. Set the first to "inTopic".
12- Configure the other one for "outTopic".
13- Ready!
Used libraries:
#include <WiFi.h>
#include <PubSubClient.h>GPIO Pins. Configure according to your wiring:
#define YEL 12
#define RED 13
#define GRE 14Fill in the name and password of your local network:
const char* ssid = "your ssid";
const char* password = "your password";Fill in the IP address of that format, separated by commas:
IPAddress server(000, 000, 000, 000); To find the address, type in the terminal:
ip a
The IP will be described in "inet".
Finally, fill with mqtt_user and mqtt_password, as configured in the mosquitto ( here ):
if (client.connect("espClient", "mqtt_user", "mqtt_password"))
If you want to track the message traffic via the terminal, just go back to the broker's test topic ( here ), open a terminal for Subscribe and replace the topic name with the application topic, for example "inTopic":
mosquitto_sub -d -u username -P password -t inTopic
Thank you!
💻 Computer Engeneering | ⚡ Electronic | 🇧🇷 Brazil