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lwIP-CE with TLS

Lightweight TCP/IP stack for the TI-84+ CE with an integrated Ethernet driver derived from lwIP by nonGNU. Contains a TLS 1.3 implementation and a custom lightweight trust store.

Networking Cryptography Embedded Open Source

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LWIP-CE IP: 192.168.1.84 Security: TLS 1.3 Sanity: Questionable

Painful OptimizationA full TCP/IP/TLS stack on a 48 MHz CPU with ~60KB of heap. It was painful.

Embedded SecurityTLS 1.3, curated trust store, SAST, CAVP-adjacent testing, hardware entropy profiling, and differential timing analysis profiling.

Technical DocsRead the lwIP-CE whitepaper and documentation for implementation details, constraints, and design notes.

Our Mission

We build real, useful software for the TI-84+ CE and beyond. From low-level networking to secure protocols, we push what is possible on constrained hardware.

5Open Source Projects

39 stars6 forksGitHub Engagement

7+Years of CE Work

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Lightweight TCP/IP stack for the TI-84+ CE with an integrated Ethernet driver derived from lwIP by nonGNU. Contains a TLS 1.3 implementation and a custom lightweight trust store.

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NetworkingTCP/IP, DNS, HTTP and more for calculator projects.

CryptographyModern primitives and protocols for resource-constrained devices.

Hosting & BackendsGame servers, mirrors, and custom calculator software APIs.

Open SourceTransparent, reproducible, and built with the community in mind.