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\uD83D\uDC65 Participants

ET-W2AT

No

Name

Role

Present (yes/no)

1

Mr Jeremy TANDY

Chair

No

2

Mr Rémy GIRAUD

Member

Yes

3

Mr Pablo Jose LOYBER

Member

No

4

Ms FATIMA SABAI

Member

No

5

Mr Peng  WANG

Member

Yes

6

Mr Tom KRALIDIS

Member

No

7

Mr Kenji TSUNODA

Member

No

8

Dr Baudouin RAOULT

Member

No

9

Mr Thorsten BÜSSELBERG

Member

No

10

Ms Dana OSTRENGA

Member

No

Experts

  • Weiqing Qu (BoM)

  • Wirt Kai-Thorsten (DWD)

  • Andre Fatton (VerneMQ)

WMO Secretariat

  • Enrico Fucile

  • Hassan Haddouch

  • Xiaoxia Chen

  • David Berry

  • Timo Proescholdt

\uD83D\uDDE3 Discussion topics

Item

Item

Presenter

Notes

0

Review of actions from 2023-06-26 ET-W2AT Meeting

Hassan

Actions from last meeting (June 26, 2023)

  •  Timo: to provide supporting documents of MQTT best practice.
  •  Remy: to check with Verne MQ to discuss with MQTT experts for their advice to selecting the parameters
  •  Peng: to discuss with EMQX experts for their advice to selecting the parameters
  •  Hassan: to provide a document with decisions and relevant information(using AsciiDoc, including MQTT parameters)
  •  Hassan: to collect all RTH contact points; to organize meetings with RTHs and identify the potential RTHs to play WIS2 to GTS gateway for their AoRs.
  •  Kenji: to check the possibility of providing the GTS to WIS2 gateway by JMA
  •  Enrico: to provide a drafted version of high-level KPIs to be submitted to INFCOM-3

Opening

Rémy

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

2

"We need to figure this out for the pilot project" 

Not discussed from last meeting

3

"We need to figure this out for INFCOM3" 

Not discussed from last meeting

...

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