Rémy introduces the participants and André Fatton from VerneMQ.
ET-W2AT discusses pub/sub, hierarchy and notification message format. But we haven’t discussed the MQTT parameters for further implementation of standards as baselines. Recording of today’s meeting will be shared with ET-W2AT members.
1
Presentation on advanced MQTT features
André Fatton, VerneMQ
André introduces
MQTT Basics
MQTT QoS (Quality of Service)
Discussions:
(Kai) any nodes need to subscribe to at least 2 brokers for redundancy. Question: connection failures, retained message?
(Andre) Retained message / offline messages, persistent sessions. For offline messages, persistent session is needed. Offline for one hour, estimate the volume of the messages that were missed. For the broker administrator, when all subscribers go offline or network failed. If the time window is too big, no broker can do this part. MQTT is different from database.
(Rémy) shares the flow of messages in WIS2 to alert a WIS users of data availability.
Persistent sessions
(Hassan) WIS2 users and messages with different priorities, QoS for user/message priorities settings?
(Andre) Publishers will set their QoS = 1 or 2 on their own.
(Rémy) no necessary to prioritize at message level. Challenge is more on subscriber side.
(Kai) It is more on dowloading side, for large volume, it is important to download by priority.
(Andre) Queue Priority no needed for MQTT specification.
(Rémy) Next step is to write MQTT parameters specification in one or two pages
(Hassan) MQTT Security?
(Andre) MQTT is secure by utilizing measure in the form of in the form ofMQTT level username, password, and an access control list (ACL)
✅ Action items
to share with recordings with the ET-W2AT members to review the presentation by André Fatton
to write an guide for the MQTT parameters in one or two pages
⤴ Decisions
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