Why timeout

edit

I'm experiencing a 30 sec read-timeout in a socket while sending an audio file to a server. It is between packet 3117 and 3118 in the image. To me it seems like my socket is waiting 30 seconds before sending the rest of the packets (3118-3121) in the connection. Any idea what could be happening?

Don't bother about the lines 3126-3128 since I don't think they have anything to do with the timeout and I have asked about them in another question at this forum.

https://snipboard.io/F3t65U.jpg

Thanks!