Defines the interface that you should implement to receive information on the result of a command.

For more about commands, see caplin.streamlink.CommandSubscription.

A trivial implementation would be as follows :

streamLink.publishToSubject("/SUBJECT", fieldData, {
        onCommandError: function(subject, commandErrorEvent) {
                console.log("Publish Error : " + commandErrorEvent.getError());
        },
        onCommandOk: function(subject) {
                console.log("Publish to " + subject + " Succesful");
        }
}, null);