ImodbusRTUmasterInit() sets the Master communication port and baud rate.

void ImodbusRTUmasterInit(HardwareSerial& serialPort, long baudrate)
void ImodbusRTUmasterInit(HardwareSerial& serialPort, long baudrate, uint8_t config)

ImodbusRTUmasterInit(Serial2, 9600, SERIAL_8N1);

• Keep calling the Slave or Master execution function in loop().
• The data array size must be at least the requested quantity.
• Do not treat return codes BUSY and IDLE as communication failures.
• When sharing M and D with Cnet/MC Protocol, define a single final size and initialization order. Do not call ImodbusRTUMem() or ICnetMem() again at runtime.
• Memory allocation functions do not return success status. For nonzero sizes, verify that M and D are not nullptr before accessing them in user code.

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