Need Help for communication [4 End Devices - 1 Coordinator] XBee S2

Hello everyone, I’m new here.

I have a question because i’m in front of a problem since a week and I really can’t resolve it alone.

So:
I have 5 Arduino, one is setted in Coordinator API and others in End Device API mode.

What I want is that every end devices could communicate with the coordinator, and the coordinator could send them an answer.

I tried a lot of code samples which I’ve found on internet but it doesn’t work at all.

I really need your help and hope that someone will be able to answer me.

(ps: Sorry for my english level, it’s not my mother tongue)

Thank’s in advance!

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