Network blocking

Hello,

I have written code that periodically takes specific number of samples (complex data) each time. I am traversing the received samples to collect dynamic data (read only) building a json object that will be sent to a db.
I am facing a series issue with network blocking/delay.

My assumption is that several concurrent threads (take thread and other conversion threads) are accessing the rti infrastructure resulting some sort of network blocking.

Further info:
I've got several threads:

1) Thread responsible for the take operation.

I'm trying to multicast a topic containing a large byte array (I'm sending messages with a size between 200kb and 900kb).

As far as I'm concert I have to make a custom flow controller for the DomainParticipant as well as setting some UDP properties like message_size_max and socket_buffer_size.

I've also changed the QoS policy on the dataWriter.

Whenever i start the application and starts publishing, the entire network is blocked like a ddos attack.