Hi David,

Thank you for your reply.

Here is the snippet of the code calling wolfssl_read.

        //Receive data from socket.
        char buf[RECV_BUFFER_SIZE_BYTES] = {0}; //16384 bytes

        while (true)
        {
            memset(buf, 0, RECV_BUFFER_SIZE_BYTES);

            // Wait for client to send data
            ssize_t bytesReceived = wolfSSL_read(reinterpret_cast<WOLFSSL*>(pReqHandler->getContext()), buf, sizeof(buf));

            if (bytesReceived < 0)
            {
                ERROR1("\r\nwolfSSL_read", "requestHandlerThreadProc()", getWolfSSLErrString(pReqHandler->getContext()));
                break;
            }
            if (bytesReceived == SSL_ERROR_WANT_READ || bytesReceived == SSL_ERROR_WANT_WRITE)
            {
                continue;
            }
            if (bytesReceived == 0)
            {
                break;
            }
        }
        vTaskDelete(NULL);

The above function runs in thread. For each socket separate thread will be created. "sys_thread_new" function (LwIP library  function) used to create threads.

Here is the log info of wolfSSL after adding DEBUG_WOLFSSL.

wolfSSL Entering wolfSSL_read()
wolfSSL Entering wolfSSL_read_internal()
wolfSSL Entering ReceiveData()
growing input buffer

received record layer msg
got ALERT!
wolfSSL error occurred, error = -132
wolfSSL Leaving wolfSSL_read_internal(), return -132

Regards,
Iyyappan.