#Knock Knock (for, 125 points, solved by 9)###What are they talking about?
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1. Extract an archive. View file "nanunanu". 
```;Rate: 1000000;Channels: 50000000a@000000008@50000000a@1700000008@230000000a@2900000008@350000000a@4100000009@480000000b@54..........```
2. We can see a dump. Let's go deeper. First, we can see that every moment we send/receive 1-byte. Using this we can propose possible protocols: it could be RS-232 (UART), USB, 1-Wire, CAN, I2C. 
3. Open this file in protocol analyser. I've used [Logic Sniffer](https://www.lxtreme.nl/ols/#download)
4. Possibly it can be [I2C](https://en.wikipedia.org/wiki/I%C2%B2C).
5. I2C interface uses 2 bus: SDA and SCL. If you watch more properly, you can see that Channel 1 is SCL and Channel 0 is SDA.
6. Decode a message from ASCII. Get the flag: 
```EKO{oh..icu2}```