ruby-mqtt
                                Pure Ruby gem that implements the MQTT protocol, a lightweight protocol for publish/subscribe messaging.
                            
                        How to download and setup ruby-mqtt
Open terminal and run command
                                            git clone https://github.com/njh/ruby-mqtt.git
                                        
                                        git clone is used to create a copy or clone of ruby-mqtt repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with ruby-mqtt https://github.com/njh/ruby-mqtt/archive/master.zip
Or simply clone ruby-mqtt with SSH
                                            [email protected]:njh/ruby-mqtt.git                                    
                                    If you have some problems with ruby-mqtt
You may open issue on ruby-mqtt support forum (system) here: https://github.com/njh/ruby-mqtt/issuesSimilar to ruby-mqtt repositories
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