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Send data from raspberry and read them from PC [message #1807720]

Thu, 06 June 2019 12:00

Eclipse User

Hello,
I have developed two bundles that implements a Publisher and a Subscriber.
The Publisher is installed on a Raspberry Pi2, the Subscriber is on my PC.
The publisher should send messages to my MQTT cloud, and the Subscriber should receive them. They both have the same account-name, the same application ID, the same application topic. They only differ from their client ID.
When I start the two bundles both from my pc the result is what I want (the publisher send some data, and in my console I can read the received data thanks to the subscriber). The problem is that when I install the Publisher on the raspberry the data are sent to the cloud, but the Subscriber is not listening on the correct topic (because of the different client ID). If i choose the same client ID for both devices the cloud keep connecting one and disconnecting the other device.
How can I do?

Thanks for help,

Alessandro

Re: Send data from raspberry and read them from PC [message #1807794 is a reply to message #1807720]

Sun, 09 June 2019 10:18

Eclipse User

Hi,
if you have the same client id, then you have a stealing link and that is the reason why you are getting those disconnections.
In order to achieve your goal you have two options. The first one is that you subscribe to a topic with your client id and expect that the publisher subscribes to that topic. The other is to subscribe to a generic topic (using, for example, wildcards) and wait for a publisher to publish data in a matching topic in the pool subscribed by the subscriber.

Best regards,
Matteo

Re: Send data from raspberry and read them from PC [message #1807881 is a reply to message #1807794]

Tue, 11 June 2019 09:16

Eclipse User

Thank you very much for the reply.
How can I use the wildcards to subscribe to a generic topic? I can't find anything to implement this solution.

Best regards,
Alessandro

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