How to download and setup MQTTKit
Open terminal and run command
                                            git clone https://github.com/arnecs/MQTTKit.git
                                        
                                        git clone is used to create a copy or clone of MQTTKit 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 MQTTKit https://github.com/arnecs/MQTTKit/archive/master.zip
Or simply clone MQTTKit with SSH
                                            [email protected]:arnecs/MQTTKit.git                                    
                                    If you have some problems with MQTTKit
You may open issue on MQTTKit support forum (system) here: https://github.com/arnecs/MQTTKit/issuesSimilar to MQTTKit repositories
Here you may see MQTTKit alternatives and analogs
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