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不知道为什么 组播就是不成功
网上分享的成功案例不少，你可以参考下：http://blog.csdn.net/u013243314/article/details/37755383
现在已经能发给协调器了，但是奇怪的是，节点收不到，节点在很长的时间内总共能收到一次，这是怎么啦呢
