ITU-T H.812.4 PDF

This design guidelines document defines two Certified Capability Classes. Both Certified Capability Classes contain guidelines that document a secure mechanism by which a services application can initiate communications with an application residing within a transient piece of customer premises equipment known as a Personal Health Gateway (PHG). The two Certified Capability Classes are respectively for the services application (APS-CCC-Services) and for the PHG application (APS-CCC-PHG).

The mechanism addresses: (1) the establishment and management of a persistent long term session between the services application and the PHG application, (2) the use of the message queuing telemetry transport (MQTT) protocol for message exchange and (3) the use of short message service (SMS) to re-establish IP level connectivity with transient PHGs that have a cellular interface