A guide for developing ESP32 firmware in C++, including hardware, FreeRTOS, memory, peripherals, and field failures. ESP32 is a family of microcontrollers commonly used in connected devices; FreeRTOS is an operating system for embedded hardware.

It is for designing, debugging, and troubleshooting ESP32 firmware, including ESP-IDF or PlatformIO projects, FreeRTOS tasks, peripherals, memory, and IoT hardware.

Embedded software failures can depend on timing, limited memory, hardware wiring, or a specific chip, so general application advice may miss the cause.

esp32-cpp — Plugin by johnkozaris

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Claude Code

/plugin marketplace add johnkozaris/jko-claude-plugins

agentmods

npx agentmods add plugins/johnkozaris/jko-claude-plugins/esp32-cpp

Clone the repo

git clone --depth 1 https://github.com/johnkozaris/jko-claude-plugins

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

esp32-cpp scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/esp32-cpp/.claude-plugin/plugin.json · 30 lines

What it actually says

{
  "name": "esp32-cpp",
  "description": "Evidence-first ESP32 firmware guidance for hardware, FreeRTOS, memory, peripherals, and field failures",
  "version": "2.1.0",
  "license": "MIT",
  "author": {
    "name": "John Kozaris"
  },
  "homepage": "https://github.com/johnkozaris/jko-claude-plugins",
  "repository": "https://github.com/johnkozaris/jko-claude-plugins",
  "keywords": [
    "esp32",
    "esp-idf",
    "platformio",
    "freertos",
    "embedded",
    "c++",
    "firmware",
    "iot",
    "rtos",
    "peripherals",
    "debugging",
    "memory",
    "esp32-s3",
    "esp32-c3",
    "esp32-c6",
    "esp32-p4"
  ]
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 30 lines scan A 363da021a5aa

Subscribe to this mod's changes

esp32-cpp is a plugin published in the GitHub repository johnkozaris/jko-claude-plugins (11 stars, last pushed 5d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Code review Debugging Memory and context ai-coding claude-code claude-code-marketplace claude-code-plugin claude-code-skills

esp32-cpp

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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