How do I reconnect end-device routing with Zigbee 3.0?

[Gz]

Hello All;

I use an example code "Zigbee_OnOff_Client_Router" for Nucleo-STM32WB and "Zigbee_OnOff_Server_Coord" for Dongle-STM32WB when my coordinator lose then come back. My rounter can't send any message to coordinator. Could you please advice me?

Thank you,

Best regards.