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If the concentrator is memory constraint, it is very important to note the source route expiry timeout (SRC_RTG_EXPIRY_TIME) value should be such that no more than (MAX_RTC_SRC_ENTRIES) devices reporting within this interval. In this case concentrator should be able to store the paths back to all the nodes as they report data (even if the concentrator does not have memory to store path to all devices) as expired routes will be replaced with new routes and the network should not see broadcast route request storms originating from the concentrator which can cause the network throughput and reliability to go down significantly.
