This response is sent after the final target of the communication_request message is ready to process data.
This message exists, because after the communication_request is sent, a routing to the target needs to be
established, and this can take some time. This command then signals that the routing has been established. If
the sender of the request would immediately start sending data after the communication_request, we
would have to be extra careful not to loose any data while the handover is taking place.
In short: The communication_ready message is sent by the final destination to signal 'I am ready'.
This response is sent after the final target of the communication_request message is ready to process data.
This message exists, because after the communication_request is sent, a routing to the target needs to be established, and this can take some time. This command then signals that the routing has been established. If the sender of the request would immediately start sending data after the communication_request, we would have to be extra careful not to loose any data while the handover is taking place.
In short: The communication_ready message is sent by the final destination to signal 'I am ready'.