Suddenly received a couple of duplicate data when link quality is poor

Fengting Yang

Other Parts Discussed in Thread: CC2430

I am trying to use CC2430 to send some data in a poor link quality environment . But I found a funny phenomenon.

When I used coordination to send"1234" to router, for example, sometimes router would get 3 or 4 "1234" suddenly.

I don't set AF_ACK_REQUEST in AF_DataRequest function( the function in ZStack 1.4.1) . And there are only these 2 devices in my network.

I wonder why this happened and how to fix it.

thanks!

FT.Young

over 10 years ago

0 YiKai Chen over 10 years ago

Guru 735455 points

This might be MAC retry. I would suggest you using packet sniffer to check. You can modify maxFrameRetries in mac_pib.c to change MAC retry times.

0 Fengting Yang over 10 years ago in reply to YiKai Chen

Prodigy 30 points

Thank you for your reply !

and I have tried to set this variable to 0,which in the Ztack 1. 4.1 is in mac_api.h , but the phenomenon still appear . T_T

what's more, I am not very clear about the mac retry mechanism,is it always enabled ,no matter is AF_ACK_REQUEST set?

How can the sender know whether the message is transmitted successfully without ack form the receiver?

Would you mind tell me more? thanks a lot

0 YiKai Chen over 10 years ago in reply to Fengting Yang

Guru 735455 points

MAK retry is always enabled ,no matter if AF_ACK_REQUEST is set. You need to enable AF_ACK_REQUEST to check if the message is received by AF layer of receiver. You can refer this thread.

0 Fengting Yang over 10 years ago in reply to YiKai Chen

Prodigy 30 points

I see...

I will try today, and thanks again!

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Suddenly received a couple of duplicate data when link quality is poor