Dart M3O clinets is located in lib/src folder including the generic client, currently there are three clients helloworld, weather and MQ beside the generic one.
you can find examples in the example folder.
after cloning the repo and Dart being installed, run this command in root
dart pub get
M3O_API_TOKEN=<enter-helloworld-token-here> dart test
M3O_API_TOKEN=<token-here> dart example/helloworld_sample.dart