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CC2538: The zigbee group is connected to multiple units

Part Number: CC2538

Hi team

Please consult the following two questions.

1. Currently, two 2538 one is responsible for coodinate and one router is responsible for the end device network.
Google also seems to need two different roles. However, I want to confirm why you can't just use a 2538 coodinate pair
Multiple end devices for teamed transport? ?

2, 2538 can use zstack 3, if the end device is an older version of zstack 1.2.2a or 2.x,
May I know if backward compatible online transfer is possible? (Standard profile)

Best regards

Alex