It would be very convenient to turn on the lights in the base automatically when someone opens it.
There are some smart sockets out there, but most of them connect to external servers and require some special kind of software.
If the vendor decides to shut down their server we couldn't use our devices anymore.

The Sonoff S20 uses a ESP8266 and can be flashed with alternative firmware.
Depending on the firmware it will then support other protocols.
The device is also relatively cheap.

The ESP8266 GPIO 12 is connected to the relay (1=on, 0=off).
The GPIO 0 is connected to the push button.

• Unplug the device from power!
• Check the FTDI jumper for voltage.
  • must be set to 3.3V
• Connect the FTDI converter
  • Sonoff S20 connections

• https://github.com/arendst/arendst.github.io/raw/master/media/s20b.jpg
• 

• download ESPEasy
  • https://github.com/letscontrolit/ESPEasy/releases
• pip install esptool
• hold down the button and plugin the USB port = flash mode
• esptool.py –port /dev/cu.usbserial-00000000 write_flash 0x000 ESPEasy_v2.0.0-dev12_normal_1024.bin -fs 8m

• Connect to device AP:
  • SSID: ESP_Easy_0
  • password: configesp
• browse to http://192.168.4.1
  • configure wireless LAN settings

• connect to normal /dev/base wifi
  • browse to http://192.168.11.x
    • Config
      • Unit Name: power01
      • Admin Password: xxx
    • Hardware
      • Wifi Status Led: GPIO-13 (D7)
      • Pin mode 0 (D3): Input
    • Devices
      • 1
        • Device: Switch input
        • Name: Button
        • Enabled: Checked
        • Internal PullUp: Checked
        • 1st GPIO: GPIO-0 (D3)
        • Value 1: State
      • 2
        • Device: Switch input
        • Name: Relay
        • Enabled: Checked
        • Internal PullUp: Unchecked
        • 1st GPIO: GPIO-12 (D6)
        • Value 1: State
    • Tools
      • Advanced
        • Rules: Checked
    • Rules
      • Rule Set 1

        • on Button#State=1 do
            if [Relay#State]=0
              gpio,12,1
            else
              gpio,12,0
            endif
          endon

• press hardware button
• curl “http://192.168.11.x/control?cmd=GPIO,12,1”
• curl “http://192.168.11.x/control?cmd=GPIO,12,0”