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I've had my TellStick controlling 10 lights and one power amplifier for three months now and so far it works as expected; no negative effects on LMCE observed.
I have one design question: My power amplifier has no remote control options what so ever (classic valve amplifier). I tried to have a device hierarchy with TellStick - Nexa switch - power amplifier. My idea was to have On/Off commands implemented on the power amplifier, these would be sent to the parent. The parent would catch the comands and resend them to it's parent. Since I didn't get this to work properly I' just wondering if I was on the right track or if there is another way of implementing this kind of hierarchical device structure.
yes, a replay attack is feasible. Another option would be to sniff the id of the network and program a controller to use the same one (e.g. with the skd/szniffer). But hey, we talk about light control and such..
Z-wave door locks use the encryption command class (iirc with AES encryption) to prevent hacks like this.