There are a C, R, E. C is nearby R not C. E is nearby R not C.
Sometimes X-CTU's network side shows E is connected R and E's MP(parent) is C ,even though the RSSI between is about -90 dbm(lowest value)....
E is 10 sec pin sleep device.
I think that E maybe leave the network because of the low RSSI.
But E will rejoin R because R is nearby E.
But it isn't..
In your answer, you recommend that E connect R after R join C and C set NJ0. Then E join R.
I think we should don't be need to do it
In that case the E's MP is C, low RSSI will make E leave the network... And E should rejoin R nearby E automatically...then it's okay..
Then we don't have to set NJ0 for C to set E's parent R.
But I think it doesn't work for sometime....It's a big problem...
In the real situation. it's difficult to for the installation engineers to set NJ0 and NJFF for C ....
I did it.several times...But I forgot to set NJFF for C several times after I set E's parent R. They complains that it is not proper in the real situation.