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CloudClient subscribe to global topic [message #1708313]

Tue, 15 September 2015 12:20

paul stanton

Messages: 87
Registered: July 2009

Member

It seems the cloudClient implementation always prepends the [account_name]/[device_id]/[app_id] prefix for topics whether publishing or subscribing.

If I have a model of many similar devices and one controller (server) tracking them, it makes sense to send global messages from the controller ie:

controller.publish:
CONTROLLER/requestUpdate

client*.subscribe:
CONTROLLER/requestUpdate

However since CloudClient will always prepend the prefix to whatever subscriptions it makes, the clients will only subscribe to:

[account_name]/[device_id]/[app_id]/CONTROLLER/requestUpdate

therefore it is unsuitable for subscribing to one-to-many messages.

Is there a way to avoid this? I am hoping to use CloudClient to take advantage of its other benefits while still maintaining one connection.

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Re: CloudClient subscribe to global topic [message #1708369 is a reply to message #1708313]

Wed, 16 September 2015 01:16

David Woodard

Messages: 420
Registered: July 2014

Senior Member

Hi Paul,

Unfortunately, there is no way around the CloudClient topic structure without editing the source code. This topic structure is fundamental for sharing a single MQTT connection across multiple application and achieving topic partitioning and device identification.

You can use the DataService to achieve your goal, but you will lose some of the benefits of CloudClient.

Thanks,
--Dave

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