ImodbusRTU() checks incoming requests and handles Slave responses.

void ImodbusRTU()
void ImodbusRTU(HardwareSerial& serialPort)

void loop() {
  ImodbusRTU();
}

• 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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