Add this MCP server to Claude Code.
Name: MQTT IoT MCP
Merge into: ~/.claude/mcp.json under mcpServers

---
{
  "mcpServers": {
    "mqtt-iot": {
      "command": "npx",
      "args": ["-y", "@anthropic-community/mcp-mqtt"],
      "env": {
        "MQTT_BROKER_URL": "mqtt://your-broker.example.com:1883",
        "MQTT_USERNAME": "<YOUR_USERNAME>",
        "MQTT_PASSWORD": "<YOUR_PASSWORD>"
      }
    }
  }
}

// ── Setup ────────────────────────────────────────────────────────────────────
// 1. Set MQTT_BROKER_URL to your MQTT broker (Mosquitto, HiveMQ, EMQX, etc.)
// 2. For local testing: brew install mosquitto && mosquitto
// 3. For cloud: use HiveMQ Cloud free tier or AWS IoT Core
//
// ── Available tools ──────────────────────────────────────────────────────────
// subscribe              subscribe to topics and receive messages (supports wildcards)
// publish                send messages to a topic
// list_topics            discover active topics on the broker
// get_retained           fetch the last retained message for a topic
// inspect_payload        decode and display payloads (JSON, Protobuf, raw bytes)