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trezor-firmware/core/docs/src/communication.md
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Communication

We use Protobuf v2 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 project, which is part of this monorepo. This repository is also exported to 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.