SONOFF S31 WiFi Smart Plug with Energy Monitoring, 15A Smart Outlet Socket ETL Certified, Work with Alexa & Google Home Assistant, IFTTT Supporting, 2.4 Ghz WiFi Only (2-Pack)

I bought a single S31 to replace an unreliable Fibaro Z-Wave switch. I never even bothered to use the original S31 firmware. I took it out of the box and flashed it with ESPHome under Home Assistant. Worked great the first time with no surprises. The power monitoring seems to work, but I havent bothered calibrating it. If it continues to be reliable over time, I will definitely buy more of these.

I use for dehumidifier, Steamer, Online media box. I use for coffee maker to start 8 am. Surprised it made coffee 12pm lunch time. Too many ads in the app. For 4$ each. And Wi-Fi. CAnt beat the price but not perfect.

most apps have an option for either 2.5ghz or 5ghz. this will only work on 2.5. this should have been in the bio. will post another update after usage of a month, most notably if it crashes after brown outs.

I used tiny spring clips on a USB cable to connect to the board inside and flash Tasmota. Worked great! Unlike the KMC 30153 where they changed the underlying SOC chip (so you never know what youre getting), these have real Espressif 8266 chips in them.

The Sonoff isnt the smallest, but I needed an outlet with local control and power monitoring. I was able to flash Tasmota onto the outlet in about 5 minutes, as the Sonoff is easily disassembled. With Tasmota firmware running on the outlet, all control is local with Home Assistant. There is no need to pair the device with a server in a far away country and there is no communication going on outside of my house. In fact, I put all of my IoT devices on a VLAN that does not have any access to the internet or my normal household network. Keep everything local with local control and keep spyware out of your home.

After opening them up and flashing Tasmota firmware to the onboard chip, I can now control these via MQTT and my home control system without an internet connection needed. A VPN connection handles off-site control. I am currently using them to schedule lamps and equipment chargers periods of activity.

The internet at my house is unreliable. Days of outages in March 2023. So counting on cloud based tools is a non-starter. These plugs are easy to open up, reflash with Tasmota software, and control through a website hosted on each plug, or via an MQTT server. Im happy with the plug hardware being easy to update, and happy with the new software.

I was hoping this would work as its great value f it would have. After following the official instructions on their website I was happy to see that the plugs populated on the website. But when you read what it says on the plugs that show up it says unsupported. Clicking on the list of supported devices they are on their list. As this is their website I suspect that it wouldnt be just home assistant integration but also others including alexa or remote usage.

These plugs still have the ability to work with TASMOTA. They have to be opened and flashed via serial connections. Theres a few how-tos that show the process. Flashing TASMOTA helps me avoid relying on the cloud since I use Home Assistant on a RPi3.

I used with Tasmota to connect to Home Assistant. It adds a lot of other capabilities. Good even for just monitoring the power.