If transport priority mapping is supported on the platform, this mask is used in conjunction with "dds.transport.UDPv6.builtin.transport_priority_mapping_low" and "dds.transport.UDPv6.builtin.transport_priority_mapping_high" to define the mapping from DDS transport priority (see TRANSPORT_PRIORITY) to the IPv6 TCLASS field. Defines a contiguous region of bits in the 32-bit transport priority value that is used to generate values for the IPv6 TCLASS field on an outgoing socket. (See the Getting Started Guide to find out if the transport priority is supported on a specific platform.)

For example, the value 0x0000ff00 causes bits 9-16 (8 bits) to be used in the mapping. The value will be scaled from the mask range (0x0000 - 0xff00 in this case) to the range specified by low and high.

If the mask is set to zero, then the transport will not set IPv6 TCLASS for send sockets.

[default] 0.