if(hapClient!=NULL){
    if(!hapClient->cPair){                        // if not encrypted 
      hapClient->client.write(buffer,num);        // transmit data buffer
      
    } else {                                      // if encrypted
      
      encBuf[0]=num%256;                          // *****  BECOMES -> encBuf[0]=num & 0xFF;  // store number of bytes
      encBuf[1]=num/256;                           // *****  BECOMES -> encBuf[1]=num >> 8;  // store high byte
      crypto_aead_chacha20poly1305_ietf_encrypt(encBuf+2,NULL,(uint8_t *)buffer,num,encBuf,2,NULL,hapClient->a2cNonce.get(),hapClient->a2cKey);   // encrypt buffer with AAD prepended and authentication tag appended
      
      hapClient->client.write(encBuf,num+18);     // transmit encrypted frame
      hapClient->a2cNonce.inc();                  // increment nonce
    }
    delay(1);
  }

int HAPClient::receiveEncrypted(uint8_t *httpBuf, int messageSize){

  uint8_t aad[2];
  int nBytes=0;

  while(client.read(aad,2)==2){    // read initial 2-byte AAD record

    int n=aad[0]+aad[1]*256;            // ***** BECOMES -> int n=aad[0]+(aad[1]<<8);  // compute number of expected decrypted bytes

    if(nBytes+n>messageSize){      // exceeded maximum number of bytes allowed in plaintext message
      LOG0("\n\n*** ERROR:  Decrypted message of %d bytes exceeded maximum expected message length of %d bytes\n\n",nBytes+n,messageSize);
      return(0);
      }