ICnet() checks incoming requests and handles Cnet Slave responses.

void ICnet()

void setup() {
  ICnetMem(64, 64, 16);  // Set the M·D·R memory sizes used by Cnet Slave.
  ICnetAdr(0, 0, 0);  // Set the start addresses of M·D·R memory.
  ICnetInit(Serial2, 1, 9600);  // Set the communication port, station number and baud rate.
  if (M != nullptr) M[0] = false;
}
 
void loop() {
  ICnet();  // Check incoming requests and process Cnet Slave responses.
  if (M != nullptr) M[0] = IdigitalRead(0, 5);  // Read the input repeatedly and update only if all samples match. If HIGH and LOW are mixed, retain the previous stable state.
  if (D != nullptr) digitalWrite(32, D[0] ? HIGH : LOW);
}

• Keep calling ICnet() in loop().
• Set M/D/R sizes within the available SRAM.
• When sharing memory with Modbus, check for duplicate allocation and address conventions. Both ICnetMem() and ImodbusRTUMem() reallocate shared M/D. Assign final size management to only one of them and initialize both protocols after the last reallocation.
• Allocation functions do not return success status. Check whether M, D and R are nullptr before accessing them in user code.

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