text: module.exports = [
      function (context, config, actions, feedbacks) {
          if (config) {
              // just an example
              if (config.host !== undefined) {
                  config.old_host = config.host;
              }
          }
      },
      function (context, config, actions, feedbacks) {
          let changed = false;
  
          if (config) {
              if (config.polling == undefined) {
                  config.polling = false; //Default polling off for existing users
                  changed = true;
              }
  
              if (config.pollingRate == undefined){
                  config.pollingRate = 100; //Default polling rate to 100mS
                  changed = true;
              }
  
              if (config.password == undefined){
                  config.password = ""; //Default password to be empty
                  changed = true;
              }
          }
  
          return changed;
      }
  ]