April 2026 monthly work summary focusing on delivering robust SIM provisioning enhancements for Nordic-based cellular modems in Zephyr traditionally used for IoT devices. Key work spanned two repositories with a shared enhancement: IMSI/ICCID population during nRF9160 SLM initialization and associated parsing logic, enabling automated device provisioning and reliable SIM information retrieval.

Month: 2025-11 — Delivered a targeted networking improvement in the nrfconnect/sdk-zephyr PPP/L2 stack: LCP MRU negotiation for dynamic MTU adjustment. This feature allows the interface MTU to be adjusted based on the peer's MRU request, significantly reducing the risk of packet loss caused by MTU mismatches and improving link reliability in varied network environments. Implemented by adding parsing for the peer MRU option and updating the network interface MTU accordingly. The change is encapsulated in the commit d36c0bec85f5cbf4b92fd826e30aabe584012883 (net: l2: ppp: Add support for LCP MRU negotiation) with a clear, signed-off message by Nik Schewtschuk. Impact: - Business value: fewer MTU-related packet losses, improved throughput stability for devices communicating over PPP/L2 in diverse peer configurations. - Technical outcomes: enhanced robustness of MTU negotiation logic, better interoperability with peers, and improved maintainability through explicit commit messages.