In https://access.redhat.com/documentation/en-us/red_hat_jboss_amq/7.0/html-single/using_amq_broker/#address_setting_attributes the "address-full-policy" has a note

NOTE The BLOCK policy works only for the AMQP protocol since it is the only supported protocols that feature flow control.

This seems to be incorrect as the CORE client protocol supports flow control

See "Producer flow control" in https://activemq.apache.org/artemis/docs/2.1.0/flow-control.html

OPENWIRE protocol should also support flow control.