Is it possible the network ZigBee without coordinator?

In my network in advance unknown what the module will be coordinator (the user identified it is a physical button on the device). Can I use network without coordinator?
How I can identified coordinator programmable method or another?

No, in a zigbee mesh network, the coordinator is what establishes the network.

You would need to query the CE command from the local UART to know if it is a coordinator or not.

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