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trezor-firmware/docs/common/communication.md

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# Communication
We use [Protobuf v2](https://developers.google.com/protocol-buffers/) for host-device communication. The communication cycle is very simple, Trezor receives a message, acts on it and responds with another message. Trezor on its own is incapable of initiating the communication.
The Protobuf definitions can be found in `common/protob`.
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