No, actually. The AB7318 is capable of sending messages with RTR set.
The Dynamic Produce message can have the RTR bit set within the message config field. It’s bit 5 (the 6th, because of 0 index) not bit 4 as the documentation is incorrect on this.
My tests indicate that the “Update on RTR” option for a Produce message does not set the message’s RTR bit. Using “Query/Response” also does not set the outgoing message RTR bit. The documentation on what “Update on RTR” is quite poor.
I cannot fathom why I’d be forced to build my RTR capable messages manually myself through a single message instances, but here we are.
The AB7318 can be used as a master, and I am using it as a master. It just suffers from bad documentation and senseless limitations.