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trezor-firmware/docs/common/communication/index.md

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all: rework passphrase The `on_device` field is being moved to PassphraseAck, State messages are removed. Features newly contain `session_id`.
5 years ago
# Communication
_Note: In this section we describe the internal functioning of the communication protocol. If you wish to implement Trezor support you should use [Connect](https://github.com/trezor/connect/) or [python-trezor](https://pypi.org/project/trezor/), which will do all this hard work for you._
We use [Protobuf v2](https://developers.google.com/protocol-buffers/) for host-device communication. The communication cycle is very simple, Trezor receives a message (request), acts on it and responds with another one (response). 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. That copy is read-only mirror and all changes are happening in this monorepo.
docs/common: add links and fix some typos
4 years ago
## Notable topics
- [Sessions](sessions.md)
- [Passphrase](passphrase.md)
docs: add bitcoin signing to book index
4 years ago
- [Bitcoin transaction signing](bitcoin-signing.md)
docs/common: add links and fix some typos
4 years ago