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The "subscribe" command allows the client to express his interest in messages that match the given list of tags. The subscription is where tag wildcards are allowed, which enables multi-way hierarchical tag matching for message routing.
In order to execute the "subscribe" command, the client has to send the following message:
Object name: comma-separated list of tags, wildcards are allowed.
Message name: "subscribe".
Message content: string field named "destination_object" describing the intended name of the object that will receive updates for this subscription.
If the subscription is successful, the broker replies with an empty parameters object.