def get_next(object_list)
      varbind_list = @mib.varbind_list(object_list, :NullValue)
      request = GetNextRequest.new(@@request_id.next, varbind_list)
      try_request(request)
    end
def get_next(object_list)
      varbind_list = @mib.varbind_list(object_list, :NullValue)
      request = GetNextRequest.new(@@request_id.next, varbind_list)
      try_request(request)
    end
Sends a get-next request for the supplied list of ObjectId or VarBind
 objects.

 Returns a Response PDU with the results of the request.