[wpan-tools issue]wpan-ping: recv() function for receiving wpan-ping packets

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Hi,

Recently I find a wpan-ping problem: wpan-ping process is always
running, when there is another process runing on wpan interface, which
will also transmit packets via wpan, the non-wpanping packets will also
be received by recv() of wpan-ping, leading to the "Sequence number did
not match" problem. It seems that the recv() function can not filter out
non-wpanping packets.

To avoid the influences of packets transmitted by another process, I add
some codes to do the filtering for wpan-ping client and wpan-ping
server.

Do you consider this as a bug for wpan-ping? If yes, I'll submit the
modification as a new patch for discussion, thank you all!

Best Regards,
Xue Wenqian


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