I’ll be very brief on Part 2:  Since I already wrote extensively on the install and configuration:
sudo apt-get update sudo apt-get install oracle-java8-jdk sudo update-java-alternatives -s jdk-8-oracle-arm-vfp-hflt wget -qO - 'https://bintray.com/user/downloadSubjectPublicKey?username=openhab' | sudo apt-key add - echo "deb http://dl.bintray.com/openhab/apt-repo stable main" | sudo tee /etc/apt/sources.list.d/openhab.list sudo apt-get update sudo apt-get install openhab-runtime sudo service openhab status sudo service openhab start
See https://openhardwarecoza.wordpress.com/2015/03/29/openhab-mqtt-arduino-and-esp8266-part-1-setting-up-your-environment/ for more details on configuring OpenHAB
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