Swift NWConnection - 接收失败，出现错误“流上没有可用消息”

Question

我目前正在开发一个 iOS 应用程序，我需要连接到另一台设备。使用 TCP 成功建立了 NWConnection，我可以从远程设备接收一条（并且只有一条）消息并立即收到错误消息。连接被取消（我猜是由错误引起的）。控制台日志显示：

Hello World.
[connection] nw_flow_add_read_request [C1 <ip and port of remote device> ready channel-flow (satisfied (Path is satisfied), viable, interface: en0, ipv4, ipv6, dns)] already delivered final read, cannot accept read requests
[connection] nw_read_request_report [C1] Receive failed with error "No message available on STREAM"
error

我的代码如下所示：

Hello World.
[connection] nw_flow_add_read_request [C1 <ip and port of remote device> ready channel-flow (satisfied (Path is satisfied), viable, interface: en0, ipv4, ipv6, dns)] already delivered final read, cannot accept read requests
[connection] nw_read_request_report [C1] Receive failed with error "No message available on STREAM"
error

远程设备只发送一个包，为了接收更多包，该方法被再次调用。

编辑：我打印了错误消息并得到

error: Optional(POSIXErrorCode: No message available on STREAM)

这似乎是指 POSIXError ENODATA。