Hello Feng, NX_PTR_ERROR means that either &udp_socket or &packet_ptr are not valid pointers. Before you call the function, make sure that packet_ptr is POINTER to existing NX_PACKET struct, i.e. NX_PACKET packet; NX_PACKET * packet_ptr = &packet; I can't investigate the thread as the one you posted is for pdc, not netx. Regards
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