pi-gpio-mqtt

Application for sending GPIO state updates to MQTT bus and update state according to messages from MQTT bus. Has UI to see state and control pins directly.

Getting Started

Prerequisites

• Raspberry Pi with Java 8 for run
• Any system with Maven and java 8

You can build use the same Raspberry to build and run

Build

• Clone repo
• Run

mvn package

Deployment

• copy target/smarthome-gpio.jar to any folder
• create file application.yaml with in the same folder

spring:
logging:
 level:
   smarthome.service: DEBUG
   org.eclipse.paho: INFO
io:
 input:
   - 0
   - 1
 output:
   - 2
   - 3
mqtt:
 brocker: tcp://192.168.0.4:1883

Update this template with correct pin numbers

Run

execute

java -jar smarthome-gpio.jar

Wait for start (on my Raspberry pi 1 it take ~120 seconds

Using

Any input state change will produce message: **/java-switch/gpio/in/#*, where State change on GPIO 2 pin will produce /java-switch/gpio/in/# java-switch - hostname GPIO 2 - pin number

Any message to /java-switch/gpio/out/# will lead to change pin state

State change on GPIO 2 pin will produce /java-switch/gpio/out/GPIO 2 message.

Message format:

• change (set) state to 0 is LOW,
• change (set) state to 1 is HIGH

Raspberry Pi host has simple UI to see and change pins state. It is available by URL: http://java-switch:8080/io/

It can be run on Windows for test purposes. On Windows app will use mocked service for GPIO instead pi4j library.