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Update note for broker that are not 100% mqtt compliant For qos=2 and retain flag
gateway_to_backend/README.md
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| of the gateway can be implemented instead of only once with the retained flag. | ||
| Consequently, backends will have to wait for a period time after the subscribing to | ||
| this topic before being noticed of all gateway status. | ||
| A period of 30s is a good tradeoff between loading the broker and reactivity for backends. |
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30 seconds period might be too dense if backend needs to handle thousands of gateways. Maybe 30s - 5min would be better range. This should be configurable value.
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Why can we have it as:
- backends will pull it when needed
- GW will publish it on change
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That would change the API, not just the implementation
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Update note for broker that are not 100% mqtt compliant
For qos=2 and retain flag mainly