pm/draft-roadmap/introduce_e2e_reliability_in_status.md

# Introduce E2E Reliability in Status Communities

(Rename e2e reliability, but work as per scope)

To solve reliability is to solve two problems:

1. High heuristic that messages are received and sent
2. Ability to know whether messages are received or sent

Problem (1) can never be 100% reliable in a network environment. The previous milestones focused on it.
To solve (2), is to create an end-to-end protocol, sender to recipient, that enables the ability to know whether recipient(s) have received messages.

With this milestone, we design and deliver a first PoC for an end-to-end reliability protocol.
This protocol will be specified and implemented in the Status app for Status Communities chat rooms;
as well as in the browser for PoC Web Apps such as Qaku and Logos Forum.

**FURPS** (see deliverables)

**GitHub Milestone and deliverables**: https://github.com/waku-org/pm/milestone/29

## [SDS protocol in Status - basic integration](https://github.com/waku-org/pm/issues/194)

**Owner**: core research

**Feature**: [SDS](/FURPS/application/sds.md)

**FURPS**:
F1. Ability to know that a published message has been received by at least one member of the group (and could therefore eventually be retrieved by other members).
F2. Ability for participants to know when they have missed a message
U1. When sending a message to a large group, the application knows whether it was received by other group members, with high probability
U2. When being part of a large group, the application is able to know whether they are missing messages

**Checklist**:
- [ ] Specs: link to specs
- [ ] Code: link to GitHub issues/PRs/Epic
- [ ] Dogfood: link to dogfooding session/artefact
- [ ] Docs: links to README.md or docs.waku.org (TBD)

## [SDS protocol in Status - basic recovery]()

**Owner**: chat app dev

**Feature**: [SDS](/FURPS/application/sds.md)

**FURPS**:
- F3. Ability to resend unacknowledged messages
- F2. Ability to retrieve missed messages using Waku store protocol
- U3. When being part of a large group, the application is able to retrieve missed messages

**Checklist**:
- [ ] Specs: link to specs
- [ ] Code: link to GitHub issues/PRs/Epic
- [ ] Dogfood: link to dogfooding session/artefact
- [ ] Docs: links to README.md or docs.waku.org (TBD)