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menu_book Course Curriculum (Raspberry Pi) expand_more

Linux & Setup

Raspberry Pi OS imaging headless SSH setup hostname configuration package updates systemd service basics journalctl logs environment variables Python virtual environment

GPIO Digital I/O

GPIO pin numbering digital output LED digital input button pull-up resistor button debounce PWM LED brightness GPIO cleanup edge detection

Sensors & Buses

I2C device scan I2C sensor read SPI overview SPI transfer UART serial read 1-Wire temperature sensor ADC via external chip sensor calibration

Automation

cron scheduled task systemd autostart app camera capture filesystem data logging MQTT publish MQTT subscribe HTTP sensor endpoint local SQLite logging

Networking & Services

static IP concept mDNS hostname Wi-Fi configuration SSH key authentication SFTP file transfer Nginx reverse proxy firewall with ufw network diagnostics

Hardware Projects

servo control ultrasonic distance sensor relay module safety RGB LED mixing buzzer tone PIR motion sensor rotary encoder safe shutdown button

Raspberry Pi / Automation

MQTT subscribe

Learn MQTT subscribe in Raspberry Pi with a dedicated explanation, a concept-specific example, practical cautions, and a mastery check.

12 min read • Intermediate

raspberry-pi-030.py

python

import paho.mqtt.client as mqtt
def on_message(client,userdata,msg): print(msg.topic,msg.payload.decode())
client=mqtt.Client(mqtt.CallbackAPIVersion.VERSION2); client.on_message=on_message
client.connect('192.168.1.50',1883); client.subscribe('lab/#'); client.loop_forever()

What to watch

Content source & attribution

Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

MQTT subscribe Mastery Check →

HTTP sensor endpoint