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Meet Refoss P11S Open API Smart Plug
The smart home market is full of generic Wi-Fi plugs that promise convenience but often fall short when it comes to flexibility, local control, and developer-friendly features. That’s where Refoss steps in — a new brand with a clear mission: empowering advanced users with tools that go beyond “plug and play.” Their debut lineup includes the Refoss P11S Open API Smart Plug (EU Version), a compact yet powerful smart plug designed with energy monitoring, Home Assistant integration, and full API support from day one. Unlike mainstream alternatives such as Meross, Refoss products are tailored to power users, makers, and smart home enthusiasts who want control without cloud lock-in.
With support for JSON-RPC 2.0 via HTTP, webhook, and MQTT, Refoss P11S allows advanced users and developers to build custom integrations. Whether you’re a Home Assistant power user or a developer building unique automations, this open approach ensures no walled gardens or closed ecosystems. The P11S tracks power consumption in real time, with hourly exports and cloud-based statistics. This is perfect for monitoring appliances like heaters, dryers, or any high-draw device.
Refoss P11S works natively with Home Assistant, giving you instant access to automation, dashboards, and smart energy tracking. It’s a plug that fits perfectly into any privacy-focused smart home setup. At just 5.0 × 5.7 × 4.4 cm, the P11S is engineered to avoid blocking adjacent sockets — a detail that makes it more versatile than many bulkier plugs on the market.
Designed to handle demanding appliances, the P11S supports up to 16 amps, making it suitable for energy-hungry devices like space heaters, dryers, or kitchen appliances without compromising safety. With customizable overload, current surge, and voltage fluctuation protections, users can define safety limits and prevent overheating, fire risks, or unexpected shutdowns.
The P11S is only the beginning. Refoss already offers the R11 relay switch and R21 dual relay, with EM06P and EM16P energy monitors on the horizon. This makes it clear that Refoss is building an ecosystem focused on power users and energy-aware smart homes.
The Refoss P11S Open API Smart Plug (EU Version) is a rare gem in the smart plug market. By combining open developer access, real-time energy monitoring, Home Assistant compatibility, and customizable protections, it strikes the perfect balance between everyday practicality and advanced control. If you’ve been frustrated with the limitations of mainstream smart plugs, the P11S might be exactly what you’ve been waiting for.
Refoss P11S Open API Smart Plug Main Features
– Fully Open API Access: Supports JSON-RPC 2.0 via HTTP, webhook, and MQTT for advanced custom integrations.
– Energy Monitoring: Track energy consumption in real-time with hour-level export and cloud-based statistics.
– Home Assistant Integration: Seamlessly integrate with Home Assistant for enhanced automation and monitoring.
– Compact Design: Space-saving profile fits adjacent outlets without blocking, ideal for tight spaces and multi-plug setups.
– 16A Rated for Heavy-Duty Use: Handles demanding devices like heaters or dryers with enhanced safety and stability.
– Safety Design: Built-in overvoltage, overcurrent, and overpower protection for secure operation.
Refoss P11S Open API Smart Plug can be useful in a variety of real-life scenarios:
– Kill Phantom Power. Automatically turn off devices drawing standby power—such as chargers or DVR boxes—when their consumption drops below a threshold for a set time, eliminating wasted energy.
– Heavy-Duty Appliance Tracking. Plug in high-wattage appliances like heaters or kettles; thanks to its 16 A / 4160 W rating, the P11S handles it safely while monitoring consumption.
– Energy Spike Alert. Set rules in Home Assistant to notify you if a device’s power draw spikes above a certain wattage—handy for catching overheating or malfunctioning appliances.
– Sunrise-Based Automations. Use automation triggered by sunrise/sunset to switch on devices—for example, turning aquarium lights on 30 minutes after sunrise via the plug.
– Away-Mode Power Down. When no one’s home, automatically switch off non-essential devices—like routers, TVs, and gadgets—to save energy and enhance security.
– Appliance Energy Reports. Track hourly energy usage and generate reports to identify energy-hungry devices—perfect for monitoring monthly consumption and saving costs.
– Local & Secure Automation. With open API access (JSON-RPC, HTTP, MQTT, webhook), create fully local automations—no cloud dependency, ensuring privacy and reliability.
– Stylish Multi-Plug Setups. Its slim profile avoids blocking adjacent outlets—ideal for power strips or wall sockets where space is tight.
– Smooth Home Assistant Integration. Seamlessly integrate with Home Assistant via MQTT or the Refoss RPC add-on for full control and energy data—just plug in and go.
– DIY Developer Playground. Tinkerers and developers appreciate the Refoss P11S for its well-documented open API, enabling quick control through HTTP or MQTT, and the option to trigger webhooks for custom custom workflows.
Refoss mobile application
The Refoss App is the central hub for managing Refoss smart home devices, and when paired with the new Refoss P11S Open API Smart Plug, it offers a refined balance between simplicity for everyday users and flexibility for developers and power users. The app’s interface is clean and intuitive, making it accessible for those new to smart home automation. Setup is straightforward, with clear prompts for adding new devices, connecting to Wi-Fi, and configuring automation rules. Once connected, the smart plug can be managed instantly through the app’s main dashboard.
Where the Refoss App truly stands out is its openness. Unlike many closed smart home ecosystems, the P11S plug supports fully open API access, including JSON-RPC 2.0, webhook, and MQTT. Through the Refoss App, developers can quickly test integrations, monitor device status, and push advanced automations to their home server or third-party platforms like Home Assistant. This makes the Refoss ecosystem attractive not only to typical smart home users, but also to hobbyists, makers, and developers looking for deeper customization.
During testing, the Refoss App proved responsive, with minimal lag in executing commands. Automations triggered consistently at scheduled times, and integration with voice assistants worked smoothly. The ability to view energy consumption data further strengthens its value, especially for users who want to monitor and reduce their household electricity usage. The Refoss App is a strong companion to the P11S Smart Plug, blending a user-friendly interface with developer-friendly flexibility. Everyday users will appreciate its reliability, scheduling, and voice integration, while power users and developers will benefit from its open API and advanced connectivity options.
You can download Refoss application latest version for free from Google Play Store or from App Store.
Refoss P11S Open API Smart Plug Specifications
Brand: Refoss
Model: P11S / P11S-EU V1.0
Type: Smart Plug
Version: EU
Input: 100-240V 50/60HZ 16A
Output: 100-240V 50/60HZ 16A
Built-in Safety Protections: Overvoltage, Overcurrent & Overpower protection
Wireless standard: IEEE 802.11 B/G/N 2.4GHz & Bluetooth 5 BLE
Open API Support: JSON-RPC 2.0 via HTTP, Webhook & MQTT
Energy Monitoring: Real-time power usage tracking, Hour-level data export, Cloud-based statistics
Firmware version: 1.1.2.1.1.2
Color: White
EAN: 6942349219054
What’s In The Box
1 x Refoss P11S Open API Smart Plug
1 x English Quick Start Guide
1 x Operation Instructions QR code card
1 x Packaging Box
Photo gallery full album here. Official page here. Read more about Refoss products here.
About Refoss. A brand new, developer-focused smart home brand built with Energy Monitor, Home Assistant integration and Open API support from day one. Refoss is tailored for advanced users who prefer local control and deeper customization.
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