What does 'NDDS_Transport_UDPv4_receive_rEA:OS recvfrom() failure, error 0X2738' mean?
Errno 0x2738or 10040 is WSAEMSGSIZE. It indicates that a datagram failed to be sent or received because an OS or hardware buffer was smaller than the datagram.
Check for consistency between the publishing and subscribing Participant’s Transport property: transport.parent.message_size_max.