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Add segmentation

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fryorcraken 2025-06-06 16:32:35 +10:00
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draft-roadmap/create_chat_sdk.md
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@ -40,7 +40,7 @@ This milestone is complete when a development preview of the Chat SDK is publish
**GitHub Milestone and deliverables**: <TODO>
## [ChatSDK - Developer Preview ](https://github.com/waku-org/pm/issues/<TODO>)
## ChatSDK Developer Preview
**Owner**: App/Chat Research
@ -98,10 +98,28 @@ For library ChatSDK:
**Owner**: App/Chat Dev
**Feature**: [Segmentation](<path/to/furps/file>) TODO
**Feature**: [Segmentation](/FURPS/application/segmentation.md)
**FURPS**:
- <F1. copy-paste full furps statement>
- F1. Outbound messages larger than the maximum Waku message size are partitioned in several messages to fit in Waku messages.
- F2. Inbound partitioned messages are reconstructed in a whole message.
- F3. A capping limit is applied to pre-segmented messages (e.g. 100MB).
- F4. Messages under the maximum message size are not modified.
- U1. Only takes a maximum message size as a parameter.
- R1. Reconstruction can be performed even when parts are received out or order.
- R2. Reconstruction can be performed as long as 87.5% of the segments is received.
- R3. If too many parts missing to reconstruct an informative error should be logged.
- P1. The payload overhead does not exceed 12.5% overall, and 100 bytes per segment.
- S1. Nim
- S2. Golang
- S3. Rust
- +1. Segmentation metadata should not reveal information about the original message content
- +2. Relevant for all Waku nodes
**Checklist**:
- [ ] Specs: link to specs