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RDM General Implementation Discussion General Discussion and questions relating to implementing RDM in a product.

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Old July 18th, 2013   #1
SeanSill
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Default Errors and Sub Device All Call

Recently OLA has been working on adding more soft RDM responders for developers to play around with. One of the recent ones is a dimmer with sub devices.

We've run into an issue with the SUB_DEVICE_ALL_CALL and when/how/or at all to report errors.

The perfect example is with a SET DMX_START_ADDRESS. Where the root device doesn't have an start address. In our current implementation we only send back the response from the root device. Which right now looks like a NACK_UNKNOWN_PID, but each sub device gets the message and changes the start address of all sub devices even though it comes back as a nack.

Simon and I discussed it a bit and there are arguments to make SUB_DEVICE_ALL_CALL only affect sub devices and not the root device or all devices including the sub device.

Thoughts? How is the forum approaching this?
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Old July 18th, 2013   #2
ericthegeek
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My interpretation has been that SUB_DEVICE_ALL_CALL should only effect Sub-Devices and not change the root at all.

In the case where someone sends a broadcast request to SUB_DEVICE_ALL_CALL, only responders that have sub-devices should act on the request.


How the respond gets a bit dicey when you have a mixed collection of sub-devices. Lets say you send a SET DMX_START_ADDRESS to a responder that has 2 sub-devices, but only one of the sub-devices supports the DMX_START_ADDRESS PID. Both "NACK Unknown PID" and "ACK" would be appropriate.
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Old July 19th, 2013   #3
nomis52
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I agree with Eric here (sub-devices only), although I don't think the standard calls this out.

It does however say:

"All sub-devices shall report an identical list for SUPPORTED_PARAMETERS. This list may be different than that of the Root device."

So you shouldn't see "NACK Unknown PID" but you may trigger other NACK conditions.
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