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The ``publish'' command allows data producers to send a new value and associate it with a list of tags. In order to execute this command the publisher has to send the message with following structure:
Object name: comma-separated list of tags.
Message name: "publish".
Message content: arbitrary.
This is a one-way message and there is no reply.
The broker republishes the messages by sending the update message to each matching subscriber. The update message has the following structure:
Object name: as requested by the subscriber (see the description of "subscribe" command).
Message name: "update " followed by a list of tags, as used by the publisher.
Message content: as used by the publisher.