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Yes. The extension itself is free and open source (Apache-2.0), now and always. On top of that, the free tier lets you start with no key, no account, and no card: it runs on a managed model out of the box. When you want a specific model or heavier usage, bring your own OpenAI-compatible key.
Your prompts and the context the agent needs go to whichever model provider you use. On the free tier that is our managed model; with your own key it is your provider. See privacy and security for the full picture.
Any model on an OpenAI-compatible endpoint with strong native tool-calling. Start with Claude Haiku 4.5 (the benchmark model). See Models for recommendations and exact settings.
Yes, point it at a local OpenAI-compatible server such as Ollama or LM Studio. The model still needs solid tool-calling to drive hardware workflows.
Nordic nRF52, nRF53, and nRF54 on nRF Connect SDK (Zephyr), and Espressif ESP32, ESP32-S3, and ESP32-C6 on ESP-IDF. BLE on both, Wi-Fi on ESP. More is on the roadmap.
Yes. Adsum drives your existing toolchain: the nRF Connect Extension Pack for nRF, and an ESP-IDF install for ESP. See getting started for setup.
No. The expertise behind the agent is firmware knowledge authored and curated by engineers, not scraped from user projects. See how it works.
No. Adsum IoT Coder is an independent open-source project. It works with their SDKs but is not endorsed by or affiliated with either company.