RV temperature monitor over rs485/modbus
pin connections on DevEBox STM32F4xx_M (STM32F407VET6) RS485 on Serial3 DI to TX(PD8) RO to RX(PD9) DE to PD12 RE to PD11
LCD i2c1 SCL PB8 SCA PB9
Rotary Encoder encA PE2 encB PE3 encBtn PE4
LTE modem on Serial1 TX PA10 RX PA9 5 PE5 6 PE6
LIBRARY ERRORS ArduinoModbus defines ON as 1, messing up other librarys
ARDUINO MODBUS /src/libmodbus/modbus.c line 867 change ON : OFF to 1 : 0
/src/libmodbus/modbus.h remove defines for ON and OFF