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CONCENTRATOR_DISCOVERY_TIME does not work

Other Parts Discussed in Thread: Z-STACK, CC2530

I enabled concentrator in ZC and set CONCENTRATOR_DISCOVERY_TIME=120 according to application note 

SWRA427C.

However, I notice that the MTO route request is sent every 55 seconds rather than 120 seconds.

In fact, I changed CONCENTRATOR_DISCOVERY_TIME to 250 and it turns out the route request is still sent every 55s. It seems setting CONCENTRATOR_DISCOVERY_TIME is not working at all.

Is that a bug in z-stack or am I doing something wrong?