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trezor-firmware/core/docs/src/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.
## Definitions
Protobuf messages are defined in the [Common](https://github.com/trezor/trezor-firmware/tree/master/common) project, which is part of this monorepo. This repository is also exported to [trezor/trezor-common](https://github.com/trezor/trezor-common) to be used by third parties, which prefer not to include the whole monorepo. This copy is read-only and all changes are happening in this monorepo.