GCDAsyncUdpSocket 發送廣播包時，出現Error receiving：error code ＝ 1

使用GCDAsyncUdpSocket，綁定IP，端口號，組播IP後，一切正常運行，真機調試，出現下面的錯誤。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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