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end device retransmission problem?

hi

  i found that end device often retransmission data,i don't know what causes this problem.

this distance between the end device and its parent is very close.and i use the sniffer to catch the packet and the rssi of the packet are all larger than -30dbm.

but the the retransmission phenomenon is quite obvious;

the screenshots is shown as follow

  

what can i do to solve or inprove this phenomenon?

hoping your advice whether right or wrong?

regards!

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