This Section 3.1 is informative and summarises Section 3.
Section 3 introduces key terms used in the GBCS:
Messages are how Devices communicate between themselves and with organisations remote from Consumers’ Premises. Such Messages are ‘end-to-end’ and ‘unicast’ in that:
they all identify the sender (e.g. a Supplier) and the intended recipient (e.g. an ESME); and
they are all intended for processing by the intended recipient, even though they may pass through intermediate Devices, such as a Communications Hub. Most Messages pass through Communications Hubs unaltered, save for any ‘wrapping’ information needed for transport purposes. The only exception is where a Communications Hub Device is the intended recipient or is the sender (in these cases the Message is processed by the CHF or GPF), or where covered by the Tapping Off Mechanism (Section 10);
Messages are one of:
a Command to a Device or a corresponding Response;