[   102][I][esp32-hal-i2c.c:75] i2cInit(): Initialising I2C Mast

=== ESP32-S3 Rain Barrel System Starting ===

Core: 1, Freq: 240 MHz
Debug level: 5
I2C internal pull-ups enabled on SDA=15 SCL=7
Pin 4 set to HIGH
I2C scan on SDA=15, SCL=7
I2C device found at 0x20
I2C device found at 0x21
I2C device found at 0x27
I2C scan complete: 3 device(s) found
Failed to write PCF8574 at 0x21, I2C error 2
Pin 17 set to LOW
[   678][V][esp32-hal-uart.c:330] uartBegin(): UART2 baud(9600) Mode(800001c) rxPin(5) txPin(6)

[   687][V][esp32-hal-uart.c:416] uartBegin(): UART2 not installed. Starting installation

[   695][V][esp32-hal-uart.c:467] uartBegin(): UART2 initialization done.

MODBUS RS485 initialized: RXD=pin5, TXD=pin6, Baud=9600
Sending init command (FC06 Write Single Register)...

Init Response: E0 (total: 1 bytes)
MODBUS TX: 01 03 00 04 00 01 C5 CB (CRC)
Setup complete


[  1402][W][Wire.cpp:301] begin(): Bus already started in Master Mode.

MODBUS RX: FF (total: 1 bytes)
Unexpected response length: 1 (expected 7)

MODBUS TX: 01 03 00 04 00 01 C5 CB (CRC)
MODBUS TX: 01 03 00 04 00 01 C5 CB (CRC)
MODBUS TX: 01 03 00 04 00 01 C5 CB (CRC)