http://sigma.i2p/post/63?reply_to=195
So announce message simply states which arbitrary chosen aspect is announced, and other participants react to the ones they understand. Nodes process node announces, and add peers/routes/paths, chat apps process chat app announces, and handle those, and so on. Primitive node like a temperature sensor might just ignore the rest of the network, and blindly send data packet each minute to a predefined destination through one of its peers.
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