There are Zigbee buttons that don’t even need batteries. They produce the necessary energy to send a signal from the energy you put into clicking them. Incredible stuff out there.
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- 2 yr. ago
- Posts
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- 254
- Joined
- 2 yr. ago
Depends on the usecase. If you don’t need chat history for new-joiners, you can work with a single key per group, rotating it whenever someone joins or leaves. Since the server broadcasts a „so-and-so has left/joined“ it might as well include the new key. That key is then used by everyone in the group, so you can still broadcast all messages and don’t have to encrypt them individually.