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antorcha/PROTOCOL

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Protocol
========
<Type> <Seq> <MaxSeq>
0 0 X Ping (no further payload)
1 0 0 Pong (maybe return version string in the future)
2 0 0 Reset (64 bytes reset secret)
4 0 N Unlock secret (64 bytes payload)
4 1..N-1 N Firmware binary (64 bytes payload)
4 N N First half of hash
5 n N Firmware ACK
6 0..N-1 N+3 Image binary (64 bytes payload)
6 N N+3 Salt A
6 N+1 N+3 Salt B
6 N+2 N+3 Hash A
6 N+3 N+3 Hash B
7 n 0 Image ACK
8 0 4 Parameter block (64 bytes payload)
8 1 4 Salt A
8 2 4 Salt B
8 3 4 Hash A
8 4 4 Hash B
9 n 0 Parameter ACK
Unlock, firmware, image, and parameter packets all have a fixed-size
64 bytes payload. Pings and acknowledgements have no payload. Pongs
may have a variable-size payload.
Even numbered packet types correspond to packets sent from the remote
controller to the device. Odd numbered packet types correspond to
responses. The device never initiates communication.