This repo contains code by @maarten-pennings and @Utyff from this repo:

https://github.com/maarten-pennings/303WIFILC01

It is adapted to use PlatformIO for ease of building. All kudos go to the original authors, patches welcome!

• Install Visual Studio Code and the PlatformIO plugin
• Clone the repo and open it using vscode
• Open the PlatformIO menu, select 303WIFILC01 target and click Build
• ensure no errors are reported and a SUCCESS status is shown

It might be a good idea to back up the origina

WARNING: Some skills required. Read through the whole section before attempting. The process may damage or brick the clock. Use at your own risk!

• Disconnect the clock from power
• Solder a UART adapter to the RX/TX/GND pads on the back of the clock
• Press and hold the SET button on the back of the clock
• Connect clock power via MicroUSB
• A red LED on the back should blink once - the device is now in BOOT mode ready for flashing
• Connect UART adaper to the PC running PlatformIO
• Optional: back up original firmware using esptool esptool -p /dev/ttyUSB0 read_flash 0 0x100000 fw.bak
• in the PlatformIO menu, select 303WIFILC01 target and click Upload
• Wait until the process reports SUCCESS - if it fails, check that the serial port is set up correctly and that there is nothing else using it
• The clock should now boot. If it does not - power cycle it

The clock can only be configured in a special mode.

• press the SET button immediately after plugging in power. This is tricky as pressing the button too soon will trigger BOOT mode so give it a few tries. The display should read dCLC
• Using a smartphone or other device, search for open WiFi networks and connect to dCLC-NNNNNN
• access IP 10.10.10.10 in a browser to get the configuration menu
• set up WiFi parameters and other settings as needed
• save the settings
• restart the device from the web page
• once a connection is established, time should be syncronised over NTP
• if something fails - repeat the steps
• time is persisted in the RTC so if the battery is present, time will be kept even when the clock is disconnected from power

If the clock misbehaves, connect it to a computer using the UART adapter used for flashing and use a terminal emulator like minicom to review logs. Normally, the firmware will print its configuration during startup and then show a timestamp every second of operation.