function WeatherManager:get_state_as_string()
      local lvlstrings = {}
      for lvl_name, st in pairs(self.state) do
            local curs = self:pack_state(st.current_state)
            local nexs = self:pack_state(st.next_state)
            local grn = self:pack_graph_name(st.graph_name)
            table.insert(lvlstrings, grn .. "=" .. curs .. "," .. nexs)
      end

      local result = table.concat(lvlstrings, ";")
      if result == "" then
            result = "indoor = partly, clear"
      end
      return result
end