GCDAsyncUdpSocket 发送广播包时，出现Error receiving：error code ＝ 1

使用GCDAsyncUdpSocket，绑定IP，端口号，组播IP后，一切正常运行，真机调试，出现下面的错误。socket Error receiving: Error Domain=GCDAsyncUdpSocketErrorDomain Code=1 "Must bind socket before you can receive data. You can do this explicitl

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