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组播偶尔没响应问题，协议栈3.0.2
有的时候组播可以，用的时候一点反应都没有，抓包如附件，是没发出去还是终端没收到，
两组终端，一组组ID为0xA11A，另一组组ID为0xA22A
组播偶尔没响应.psd
