This guide will walk you through creating a Smart WiFi Restarting Unit using a Tasmota-supported smart plug, specifically the Sonoff S31. This project is based on the Tasmota firmware and involves some hardware modifications using a soldering iron. Ensure you have the necessary physical resources listed below before starting.

1. Tasmota-supported smart plug (e.g., Sonoff S31)
2. Soldering iron
3. USB-to-UART converter with 3.3V (e.g., USB-to-UART Converter)

• Tasmota Firmware
• Using Tasmota without a network

1. Flash Tasmota Firmware:

   • Follow the official Tasmota firmware flashing instructions provided here.
   • Connect the USB-to-UART converter to the Sonoff S31 for firmware flashing.

2. Hardware Modifications:

   • Open the Sonoff S31 casing. instructions
   • Identify and solder necessary connections according to the instructions in the Tasmota documentation.
   • Exercise caution when soldering to avoid damage.

3. Configuration:

   • Once flashed, power up the Sonoff S31.
   • Connect to the default Tasmota WiFi network using the provided documentation.
   • Access the Tasmota WebUI (default IP: 192.168.4.1) to configure WiFi credentials.

4. Modifications:

   • upload the autoexec.bat file to the GUI via Consoles -> Manage File System
   • go to terminal via Consoles -> Console and add execute line-by-line:
   • Check out the formatted_rules_with_explanation.bat file for pre-configured rules and explanations.

   • Rule1 ON Power1#Boot Do Time 1672531201 ENDON
     Rule2 ON Power1#Boot do backlog Var1 1; Var2 0; Var3 0; Var4 10; Var5 10; ENDON ON Time#Minute|%Var5% DO backlog LedState 0; Var; Delay 100; Ping4 8.8.8.8; ENDON ON Ping#8.8.8.8#Success==0 DO backlog Var5 %Var4%; Power1 0; Delay 40; Power1 1; Add2 1; Var3 %timestamp%; ENDON ON Ping#8.8.8.8#Success>0 DO backlog LedState 1; Var5 %Var1%; ENDON

   • Hard reboot via power-on / power-off device

1. How to Change WiFi Credentials:

1.1 Using WebUI:

• If still connected to the current network, access the Tasmota WebUI by entering the Sonoff S31 IP address in a web browser.
• Navigate to the "Configuration" tab and update the WiFi credentials.

1.2 Using Sonoff Button:

• To force Tasmota into hostapd mode, press and hold the Sonoff button for >40 seconds.
• Once in hostapd mode, connect any device to the unprotected SSID "tasmota-*."
• Access the Tasmota configuration interface through the connected device to change WiFi credentials.

2. Why not using the recommended rule in the docs?

2.1 Missing unix time

• after reboot of a modem/router no NTP is possible
• The rules are dependent on Rule1, which sets the initial Unix time. Ensure that Rule1 is executed before other rules to establish the correct time reference.

2.2 reset config disable

• with latest tasmato release, regular reboots within <10sec can lead to disable rules. Fixed in autoexec.bat

2.3 Missing ramp-up time reboots modem/router too early

• A ramp-up time of, for example, 10 minutes is missing in the rules. Adding a delay or ramp-up time is essential to allow the modem/router to fully restart before subsequent commands are executed. Adjust the timing in the rules to accommodate the restart time of your specific modem/router.

2.4. Variable init

• Without an active Wifi ( which is not available upon restart) the triggers needs to be Power1#Boot instead of system#boot
• see discussion

3. Additional Information:

• For more detailed information, troubleshooting, and advanced configurations, refer to the Tasmota Documentation.

Note: This guide assumes a basic understanding of soldering and familiarity with the Tasmota firmware. Always follow safety precautions and guidelines provided by the hardware and firmware documentation.