The 5G phone OPPO has a very big UE capability (> 2KB).
We need bigger buffers to transfer this, especially in x2 handover.
Also the sctp messages need a bigger buffer.
Note: in sctp, we didn't check for partial messages, it's now
done. When detected, we exit. To be redone differently
if needed. (Look for "if (!(flags & MSG_EOR))".)
Cedric Roux
2421b71d68