code: function (channelIdentifier, dataIdentifier, params) {
        var path;
        if (channelIdentifier) {
          path = this.constructPath(constants.CHANNELS, channelIdentifier, constants.DATA, dataIdentifier);
          return this.Core.GET(path, params);
        } else {
          return this.rejectRequest('Bad Request: A channel identifier is required.');
        }
      }
docs: Get all the data from a channel or a particular channel data point identified by `dataIdentifier`
  @param  {String|Integer}           channelIdentifier A Robin channel identifier
  @param  {String|Integer|undefined} dataIdentifier    A Robin channel data point identifier
  @param  {Object|undefined}         params            A querystring object
  @return {Function}                                   A Promise