Version 1: Release Note 28 November 2014


Processing of Commands addressed to a GSME



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Processing of Commands addressed to a GSME


The CHF, GPF and GSME shall undertake the processing steps below following receipt of a Remote Party Command by the Communications Hub, where that Command is addressed to a GSME on the same SMHAN:

  1. the CHF shall buffer the Command and instruct the GPF to set the Tunnel Message Pending flag to inform the GSME that the Command is awaiting retrieval. If the Command has been sent as multiple GBT Messages, the GPF Tunnel Message Pending flag shall only be set once all GBT Messages making up the Command have been received by the Communications Hub. If not all GBT Messages making up a Command have been received by a Communications Hub within 24 hours of the first GBT Message in that Command being received, then the CHF may discard the GBT Messages that have been received for that command;

  1. if 24 hours elapse after setting the GPF Tunnel Message Pending flag without the Command being retrieved by the GSME, the CHF may discard the Command. If the CHF discards a Command in this way, it shall notify the GPF and the GPF shall log the event in its Event Log and send an Alert with a GBZ Payload containing an Alert Code 0x809D;

  1. when the GSME turns its HAN Interface on, it shall read the Tunnel Message Pending flag and retrieve the Command using the TransferData command as defined in Section 10.2.3. Each TransferData command received by the GSME shall result in the GSME sending a DefaultResponse command;

  2. the CHF shall process the DefaultResponse commands it receives to establish when the Command has successfully been retrieved by the GSME, and shall provide an indication to the GPF accordingly. The GPF shall, when there are no further Commands or GBT Messages pending retrieval by the GSME, clear the Tunnel Message Pending flag;

  3. if a Command is a TOM Command, the CHF shall retain a copy of the Command contents. For each such Command, the CHF shall start a response timer at the point where it has received DefaultResponse command(s) confirming the GSME has successfully retrieved the Command;

  4. once a Command is successfully retrieved by the GSME, the GSME shall process the Command in line with the requirements of the GBCS. Note that (1) this processing shall result in the GSME attempting to send a Response to the Command or an Alert that it has received an invalid Command and (2) if sending a Response, the Response shall, as per the GBCS requirements, detail the success or failure of GSME processing for each instruction within the corresponding Command;

  5. the GSME shall not, under normal operating conditions, delay sending the Response and shall, where possible, send it before turning its HAN Interface off;

  6. on receipt of a Response that is a TOM Response, the CHF shall inspect the Response from the GSME. If the Response indicates successful execution of at least one elemental ZCL / ZSE command in the corresponding TOM Command, the CHF shall transfer a copy of the corresponding TOM Command contents and the TOM Response to the GPF, and shall clear the response timer for the Command;

  7. on receipt of a TOM Response and the corresponding TOM Command contents, the GPF shall clear any stored copy it has of a TOM Command and then:

        • if the TOM Command is not future dated, process the elemental ZCL / ZSE commands contained within the Command according to the status within the Response, updating data it holds accordingly. Once processed by the GPF, the GPF shall make any updated data available over the WAN and over the HAN to the Devices in the GPF’s Device Log;

        • if the TOM Command is future dated, store a copy of the TOM Command without updating any data it makes available over the WAN or HAN;

  1. if a Response to a TOM Command has not been received by the Communications Hub when the corresponding response timer reaches 6 hours:

        • the CHF may discard its copy of the TOM Command contents, clear the response timer and notify the GPF accordingly; and

        • on receipt of such a notification, the GPF shall log the event in its Event Log and send an Alert with a GBZ Payload containing an Alert Code 0x809E;

  1. for clarity, the CHF shall relay all Remote Party Responses received on its HAN Interface through the WAN interface;

  2. whenever the CHF receives an Alert detailing activation of a future dated ZCL / ZSE command from within a TOM Command (so an Alert with Alert Code 0x8066 where the Message Code in the Alert Payload is 0x006B or 0x00A3), the CHF shall pass a copy of that Alert to the GPF;

  3. on receipt of such an Alert the GPF shall compare the Originator Counter in the Alert Payload with the Originator Counter of any copy of a TOM Command it holds with the same Message Code as in the Alert Payload, and:

        • if the Originator Counters match, the GPF shall update the data it shares over the HAN and WAN with the elemental ZCL / ZSE command contained within the TOM Command; or

        • if the Originator Counters do not match or the GPF does not hold a TOM Command with this Message Code, the GPF shall send an Alert with Alert Code 0x809E, as specified by Section 16.

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