I noticed in the download section only rti_connext_dds-6.0.1.21-pro-target-x64QNX7.1qcc_cxx8.3.0.rtipkg and rti_connext_dds-6.0.1.21-pro-target-armv7QNX7.1qcc_cxx8.3.0.rtipkg but I cannot find rti_connext_dds-6.0.1.21-pro-target-armv8QNX7.1qcc_cxx8.3.0.rtipkg. Has armv8 not been made available yet?
No, we don't have QNX 7.1 for ARMV8. We do have QNX 7.0 on ARMV8, but not 7.1
You should contact your RTI liason to discuss this.