Hi, I'm using MAC codebase to build a wireless zigbee tree network. I have combine both coordinator and end device as my router. When the router associate with the coordinator, they can talk to each other. However, when I assign an end device to the router, both coordinator and end device can talk to the router. That means, the router only can listen and cannot talk. May be the coordinator cant receive the router message. Why is that? Am I missing somethings?