def get_param(key)
      if @remappings[key]
        return @remappings[key]
      end
      code, message, value = @server.call("getParam", @caller_id, key)
      case code
      when 1
        return value
      else
        return nil
      end
    end
def get_param(key)
      if @remappings[key]
        return @remappings[key]
      end
      code, message, value = @server.call("getParam", @caller_id, key)
      case code
      when 1
        return value
      else
        return nil
      end
    end
@param [String] master_uri URI of ROS Master (parameter server)
 @param [String] caller_id caller_id of this node
 @param [Hash] remappings remapps to use for local remappings

 get parameter named 'key'
 @param [String] key name of parameter
 @return [String] parameter value