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Install mosquitto with websockets

This is a guide how to install mosquitto on Ubuntu with websockets enabled.

It is more or less the same as explained in the article "Six Steps to install mosquitto 1.4.2 with websockets on debian whezy" http://www.xappsoftware.com/wordpress/2015/05/18/six-steps-to-install-mosquitto-1-4-2-with-websockets-on-debian-wheezy/comment-page-1/

Exceptions:

1. mosquitto version 1.4.10 is used.

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#!/bin/bash
# Source: https://kobl.one/blog/create-full-ethereum-keypair-and-address/

# Install dependencies
sudo apt-get install openssl curl

# Download prebuilt sha3 keccak
if [ $(uname -m) == 'x86_64' ]; then
  curl -L -O https://github.com/vkobel/ethereum-generate-wallet/raw/master/lib/x86-64/keccak-256sum
else