# Spacetime Southbound Interface (SBI / CDPI)

**Canonical:** https://apis.io/apis/aalyria/spacetime-sbi/  
**Provider:** Aalyria — https://apis.io/providers/aalyria/  
**Base URL:** https://nbi.example.spacetime.aalyria.com  
**Documentation:** https://docs.spacetime.aalyria.com/api/sbi/

Spacetime Southbound Interface (SBI / CDPI) is one of 4 APIs that [Aalyria](https://apis.io/providers/aalyria/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Telemetry, Streaming, Networking, Control Plane, and gRPC. The published artifact set on APIs.io includes API documentation.

The Southbound Interface, also called the Control to Data-plane Interface (CDPI), is the collection of gRPC services through which devices participating in a Spacetime network communicate with the controller. The Scheduling service is a bidirectional stream over which an agent receives schedule updates — steering antenna beams to establish new links, configuring RF parameters, applying flow and radio control — and returns responses; the Telemetry service pushes metrics and observations back to Spacetime. A reference Go implementation of an SBI agent ships in the same repository.

## Machine-readable artifacts (2)

- **Protobuf** — https://raw.githubusercontent.com/api-evangelist/aalyria/refs/heads/main/grpc/api/scheduling/v1alpha/scheduling.proto
- **Documentation** — https://docs.spacetime.aalyria.com/api/sbi/

## Other Aalyria APIs (3)

- [Spacetime Northbound Interface (NBI)](https://apis.io/apis/aalyria/spacetime-nbi/)
- [Spacetime Federation API (East-West Interface)](https://apis.io/apis/aalyria/spacetime-federation/)
- [Spacetime Status API](https://apis.io/apis/aalyria/spacetime-status/)

## Tags

Telemetry, Streaming, Networking, Control Plane, gRPC

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/aalyria/spacetime-sbi/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/aalyria/.