Can't connect nor send packet via TCP socket in iOS

TCP Socket messaging in iOS seems not working. 

1) Crate a new project, c++ type

2) Add code to create a socket to designated server with TCP method

Here's sample project. [Link Removed]

(*Set ip, port into remote site. Run python file that will receive TCP connection and data packet. Press connect button then send message button to see it working.)

3) Run TCP receiver in remote site

4) Try to connect then send packet.

Expected: Windows, Android, iOS all can connect and send packet with TCP protocol.

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Result: only iOS is not responding.

The reporter said that they get SE_ETIMEDOUT error code.