Rémy introduces the participants and Andre Fatton from VerneMQ.
ET-W2AT discusses pub/sub, hiearchary and notification message format. Few parameters
Using standards, to describe further implementation of standards as baselines.
MQTT parameters. Recording of today’s meeting will be shared with ET-W2AT members.
1
Presentation on advanced MQTT features
Andre Fatton, VerneMQ
MQTT Basics
MQTT QoS (Quality of Service)
Discussions:
(Kai) any nodes to subscribe to at least 2 brokers for redundancy. Question: connection failures, share data over protocol, retain 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, all subscribers go offline, network failed, queue size limit. 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
Add Comment