Under 5 Minutes: Codex Reverse-Engineered a Hitachi Steam Oven App So Grok Bot Can Cook Breakfast
- Level Advanced
- Setup1–3 hrs (estimated)
- Evidence Some evidence
- CostNot stated in source
- No-codeNo
What they did
The same user's Codex reverse-engineered the Android app for his Hitachi steam oven, built a local MCP server for it and tested hundreds of the oven's built-in recipes. He says the reverse-engineering took under 5 minutes. Grok Bot can now use that server to run the oven directly, and his next step is having it order the ingredients too.
How it went
A local MCP server that your agents can use to start and check oven programmes.
Worth knowing
- Advanced and single-user (posts in Chinese). Reverse-engineering may break the app's terms or your warranty. Never let a bot start a heating appliance while nobody is home.
Prompt
Cleaned version rewritten from the source — not a direct quote.
I have a [brand/model] smart oven that I control from its phone app. On a spare device or emulator, work out how the app talks to the oven on my home network, then build a small local MCP server with tools to list recipes, start a programme, and check its status. Keep everything on my local network and don't change the oven's firmware. Document what you found.
Recommended
Try it in Grok Bot
Codex did the reverse-engineering; Grok Bot then runs the oven and the shopping. Use the prompt in Grok Bot to plan and order.
- Copy the prompt (button below).
- Open Grok Bot chat and paste it. Replace any [bracketed] placeholders.
- Connect the listed tools (as needed) as connectors when Grok Bot asks.
- If the task repeats, ask: "Make this a daily routine."
Alternatives: the same prompt works in Codex, Claude, ChatGPT Agent, OpenClaw.
Set it up
Stack: Codex + Android emulator + local MCP server + Grok Bot
- Read the original source for full context.
- Connect the tools your agent needs.
- Paste the prompt and replace [bracketed] placeholders.
- Run once manually and check the output before scheduling it.
Generic suggested steps, not from the source.
Evidence
Thread of X posts (187 likes on the main one) with photos; a follow-up says the reverse-engineering via an Android emulator took under 5 minutes
Source: X · 2026-10-17 · Verified by us: not yet · Report broken or outdated