Skip to content
By using AWS re:Post, you agree to the AWS re:Post Terms of Use
AWS re:Postre:Post
About re:Post

Greengrass local MQTT retained flag

0

Does the Greengrass MQTT broker and IPC library support retained messages for local messages. For example component to component?

Looking at the C++ IOT SDK, I can't find any way to set the retained flag in the PublishToTopicRequest class.

I see the term "MQTT" thrown around quite a bit around the topic of AWS IPC, but it appears that AWS IPC does not use or implement any MQTT transport or spec?

Topics
Internet of Things (IoT)
Tags
AWS IoT Greengrass
Language
English

asked 2 years ago182 views

1 Answer
2
Accepted Answer

IPC is a separate mechanism from MQTT and we have our IPC pubsub docs here: https://docs.aws.amazon.com/greengrass/v2/developerguide/ipc-publish-subscribe.html. The retained messages flag is a MQTT v5 feature and there is no equivalent in IPC, so you will not be able to set such a flag when sending IPC messages. The flag should still work with any MQTT messaging you might be doing on your device.

AWS

answered 2 years ago

AWS
EXPERT

reviewed 2 years ago

You are not logged in. Log in to post an answer.

A good answer clearly answers the question and provides constructive feedback and encourages professional growth in the question asker.

Relevant content