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add protocol description

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Pavol Rusnak 2017-08-15 17:47:05 +02:00
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# TREZOR Protocol
## version 1
Messages are sent in packets of 64 bytes.
First packet has the following structure:
| offset | length | type | contents |
|--------|--------|-------------|---------------------------------------------------------------------------------------|
| 0 | 3 | char[3] | '?##' magic constant |
| 3 | 2 | BE uint16_t | numerical [message type](messages.proto#L14) |
| 5 | 4 | BE uint32_t | message size |
| 9 | 55 | uint8_t[55] | first 55 bytes of message encoded in Protocol Buffers (padded with zeroes if shorter) |
Following packets has the following structure:
| offset | length | type | contents |
|--------|--------|-------------|----------------------------------------------------------------------------------------|
| 0 | 1 | char[1] | '?' magic constant |
| 1 | 63 | uint8_t[63] | following bytes of message encoded in Protocol Buffers (padded with zeroes if shorter) |