Unboxing Refoss P11S Open API Smart Plug EU Version
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Meet Refoss P11S Open API Smart Plug – A modern smart plug that finally feels built for serious automation, real energy awareness and long-term control
The smart plug is one of the simplest inventions in the connected home world, yet it remains one of the most transformative. With one small device between the wall socket and an appliance, an ordinary lamp becomes voice-controlled, a heater becomes schedulable, and an everyday routine becomes automated. But in recent years, expectations have changed dramatically. People no longer want a smart plug that simply responds to an app command. They want something deeper. They want visibility, transparency, real energy data, and the freedom to integrate devices into their own systems rather than being locked into a single cloud ecosystem. That is exactly where the Refoss P11S Open API Smart Plug (EU Version) enters the conversation as something far more mature than the typical Wi-Fi outlet accessory. This is a compact European-format plug designed not only for convenience, but for modern automation enthusiasts, Home Assistant users, and anyone who wants measurable control over their home’s power usage. With built-in energy monitoring, full web control, voice assistant support, and one of the most impressive features in this category — a fully open API architecture supporting JSON-RPC, MQTT, webhooks, and local integrations — the P11S feels like a smart plug designed for the next era of connected living.
From the moment you open the package, the Refoss P11S gives the impression of a product built with practicality in mind. There is no unnecessary presentation or gimmickry here. The experience is straightforward, focused, and professional, much like the device itself. Inside, you find only the plug and the documentation. What stands out immediately is the compactness. This is not one of those oversized smart plugs that blocks neighboring sockets or becomes awkward on extension strips. The P11S is clearly shaped for real European households, where space around wall outlets is often limited and multi-plug setups are common. Even before powering it on, it already feels like something you could deploy throughout an apartment or office without constantly fighting for space.
The first setup experience is where Refoss shows its understanding of different users. For someone who simply wants a smart plug that works, the Refoss mobile app provides a familiar and smooth onboarding process. You plug the unit in, connect it to Wi-Fi, add it through the app, and within minutes you are controlling appliances remotely, setting schedules, and enabling voice commands through Alexa or Google Assistant. But what makes the P11S genuinely special is that it does not stop there. This is not a plug that forces you into cloud dependence. Instead, it offers a full Web UI configuration mode, accessible directly through the device’s own hotspot and local control interface. By connecting to the plug’s configuration SSID and visiting the internal portal, you can set up Wi-Fi, obtain the local IP address, and operate the plug as a networked automation component rather than just an app-controlled gadget. That dual nature is rare. The P11S works perfectly for casual smart home users, yet it also feels built for those who want full autonomy, local-first architecture, and integration flexibility that extends far beyond consumer-level expectations.
The Refoss app experience with the P11S Open API Smart Plug is clean, fast, and built for both everyday control and deeper monitoring. It shows real-time power usage instantly, with clear day, week, and monthly energy tracking, plus tools like bill calculation and exportable history. You also get strong safety options, including overheating alerts with automatic power cut-off. What makes it stand out is Open API support for Home Assistant and advanced integrations, turning the P11S into more than a smart plug — it’s a flexible energy and automation tool.
Physically, the Refoss P11S is a study in thoughtful restraint. The design is clean, minimal, and purpose-built. Its space-saving profile ensures that it fits neatly into wall sockets and extension strips without blocking adjacent outlets, which is a major practical advantage in everyday use. Despite its small footprint, this plug carries a serious electrical rating. With full 16A support, it is capable of handling demanding appliances such as portable heaters, kitchen devices, fans, or other higher-load household equipment. This immediately elevates it above many smaller smart plugs that are best suited only for lamps or chargers. The single-button control and LED indicator system is also well implemented. The button logic is intuitive, offering simple toggling, configuration mode activation, and factory reset options without complexity. The LED behavior provides clear feedback about Wi-Fi status, connection health, and service availability, while also allowing the background light to be disabled for a more discreet presence in bedrooms or nighttime environments.
In daily operation, the Refoss P11S becomes more than a remote-controlled switch. It becomes an energy awareness tool. The inclusion of real-time energy monitoring changes the way you interact with connected appliances. Instead of guessing whether a heater is drawing too much power, wondering what a device consumes overnight, or having no visibility into daily usage patterns, the P11S gives you measurable data that feels genuinely useful. The plug tracks consumption in real time and offers hour-level historical statistics, making it possible to understand not only what is running, but how much it costs, when it spikes, and where inefficiencies hide. This transforms the smart plug into something closer to a home energy instrument than a basic automation accessory. For anyone serious about reducing waste, optimizing heating routines, monitoring high-consumption devices, or simply learning how electricity is actually used in the home, the P11S adds a layer of transparency that most smart plugs never provide.
The defining identity of the Refoss P11S is not just its compact design or its monitoring features. It is the fact that Refoss has embraced openness. This plug supports fully open API access through JSON-RPC 2.0 over HTTP, along with MQTT and webhook integration. That means it can become part of advanced custom automation environments without being trapped inside proprietary ecosystems. For Home Assistant users, this is particularly powerful. Integration through HACS is clean and modern, allowing the P11S to function as a native smart entity with full switching, monitoring, automation triggers, and energy reporting. The available API layers, covering system control, authentication, scheduling, MQTT, timers, notifications, and connectivity, make this plug feel less like a consumer gadget and more like an automation building block. In a market where many smart plugs remain closed, cloud-bound, and limited, the P11S offers something rare: freedom. The freedom to build your smart home the way you want, with the integrations you choose, and with local control that remains reliable even when cloud services change.
Smart plugs become truly valuable when they control appliances that matter, and that requires safety. Refoss includes protection mechanisms against overvoltage, overcurrent, overpower conditions, and prolonged overload scenarios that could otherwise create thermal risk. The plug also supports user-defined safety protections, allowing you to configure how the device responds to abnormal electrical behavior. Combined with its 16A heavy-duty rating, the P11S feels like a product designed for real household demands rather than only light-duty accessories.
The Refoss P11S Open API Smart Plug (EU Version) is what a smart plug should look like in 2026. It is compact, powerful, energy-aware, automation-ready, and refreshingly open. It delivers an excellent experience for everyday users through app control and voice assistant compatibility, while also offering a level of integration depth that makes it genuinely exciting for Home Assistant enthusiasts and advanced smart home builders. This is not just a plug that turns devices on and off. It is a tool for understanding energy, building smarter routines, creating local-first automation, and taking control of your connected environment with confidence. For anyone looking for a smart plug that feels modern, transparent, and future-proof — especially in an EU household where space, power handling, and integration flexibility matter — the Refoss P11S is an easy recommendation and one of the most thoughtfully designed options in its category.
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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