Determine the cause of package delay in TCP

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Hello,

I am part of a team that develops a robotic cell, and we have a master PC that runs on Ubuntu. The PC sends data in MQTT JSON protocol via router to a master IO-Link.

We are experiencing random delays in communication, which can be up to 5 seconds at times. I used Wireshark to analyze the communication and have attached three examples of the captured streams.

In addition I noticed that there were some corrupted packets at the start of some of the streams.

As I am not very experienced with networking, I am hoping for some guidance on what our next steps should be to resolve this issue.

Thank you.