Data transfer issues on Raspberry Pi's

[cal-overflow]

The client script is not transferring the data properly. Nothing is received on the server side.
I have run the client script on the Raspberry Pi 3B+ and Zero W. Both machines have this issue.

Possibly Helpful Resources:
Python TCP no delay option
Python Socket Flush
Python sockets connecting but no data transfer (Pi)

[cal-overflow]

It is possible that the packets sent from the Pi are significantly less than 4096 bytes, which would explain why the server is blocking (since it is waiting to receive exactly 4096 bytes).

On an unrelated note, there is another socket option called QuickAck. Here's information detailing the difference from that and NODELAY.

[cal-overflow]

Check out this similar issue with a UDP socket transfer: Firewall blocking UDP transfer from Pi.