Question about sending big data [13681]

[advancenXX]

I find fast-dds 1.9 may loss packet when transmitting ~1MB data within device with best-effort.
All I have tried is,

• reliable, which may cause big latency;
• tcp, seems do not work;
• share memory, have to upgrade to version 2.0;
  So is there any other way to fix the problem? Thanks for your help in advance.

[Hpshboss]

Did you transmit data which is less than 1MB sucessfully?

[advancenXX]

Did you transmit data which is less than 1MB sucessfully?
Yes, for data less than 64k.

[Hpshboss]

I am a newbie for dds, but I give some suggestions:
Firstly, if data is bigger than 64KB, I remember the packet will be seperated into fragment in default, which can handle 8MB steadily for me. Therefore, I think your program's setting may be changed to limiting data size.
Secondly, there are two declaring variable method (IDL or Dynamic). If you use IDL to declare, I think it will be more steadily.

[advancenXX]

Thanks, Hpshboss.
I use IDL to declare 1Mb data and there still be packet loss.
For now I think 64k fragment is the reason why I lost data, as there may be 64k packet burst on the Sub side.