AI-generated summary
To install and configure an MQTT client using Mosquitto, follow these steps:
1. **Install Mosquitto**:
```bash
sudo apt install mosquitto mosquitto-clients
```
2. **Verify Installation**:
```bash
sudo systemctl is-enabled mosquitto
sudo systemctl status mosquitto
```
3. **Test the Setup**:
- In one terminal, subscribe to a topic:
```bash
sudo mosquitto_sub -h localhost -t test
```
- In another terminal, publish a message:
```bash
sudo mosquitto_pub -h localhost -t test -m "Hello from terminal 2"
```
4. **Set Up User Authentication**:
- Create a user with a password:
```bash
sudo mosquitto_passwd -c /etc/mosquitto/.passwd yhkz
```
- Create a configuration file:
```bash
sudo nano /etc/mosquitto/conf.d/auth.conf
```
Add the following:
```
listener 1883
allow_anonymous false
password_file /etc/mosquitto/.passwd
```
- Restart the Mosquitto service:
```bash
sudo systemctl restart mosquitto
```
5. **Test User Authentication**:
- Subscribe:
```bash
sudo mosquitto_sub -h localhost -t test -u "yhkz" -P "p4ssw0rd"
```
- Publish:
```bash
sudo mosquitto_pub -h localhost -t "test" -m "Hello - enabled auth" -u "yhkz" -P "p4ssw0rd"
```
6. **Set Up a Cron Job**:
- Edit the crontab: