diff --git a/src/capwap/dtls_bio.c b/src/capwap/dtls_bio.c
new file mode 100644
index 00000000..251d5854
--- /dev/null
+++ b/src/capwap/dtls_bio.c
@@ -0,0 +1,69 @@
+/*
+    This file is part of libcapwap.
+
+    libcapwap is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    libcapwap is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include <arpa/inet.h>
+
+#include "cw_log.h"
+#include "dtls.h"
+
+
+
+int dtls_bio_read(struct conn *conn, char *out, int maxlen)
+{
+	if (conn->dtls_buffer_len == 0) {
+		int len = conn->recv_packet(conn, conn->dtls_buffer, 2048);
+		if (len < 4)
+			return 0;
+		conn->dtls_buffer_len = len - 4;
+		conn->dtls_buffer_pos = 4;
+	}
+
+	if (conn->dtls_buffer_len > maxlen) {
+		memcpy(out, conn->dtls_buffer + conn->dtls_buffer_pos, maxlen);
+		conn->dtls_buffer_len -= maxlen;
+		conn->dtls_buffer_pos += maxlen;
+		cw_dbg(DBG_DTLS_BIO, "SSL BIO read: (maxlen = %d), remain %d", maxlen,conn->dtls_buffer_len);
+		cw_dbg_dmp(DBG_DTLS_BIO_DMP,(uint8_t*)out,maxlen,"Dump...");
+
+		return maxlen;
+
+	}
+	memcpy(out, conn->dtls_buffer + conn->dtls_buffer_pos, conn->dtls_buffer_len);
+	int ret = conn->dtls_buffer_len;
+	conn->dtls_buffer_len = 0;
+	cw_dbg(DBG_DTLS_BIO, "SSL BIO read: (maxlen = %d), remain %d", ret,conn->dtls_buffer_len);
+	cw_dbg_dmp(DBG_DTLS_BIO_DMP,(uint8_t*)out,ret,"Dump...");
+	return ret;
+}
+
+
+int dtls_bio_write(struct conn * conn, const char *data, int len)
+{
+	uint8_t buffer[2048];
+	*((uint32_t *) buffer) = htonl(1 << 24);
+	memcpy(buffer + 4, data, len);
+	int rc = conn->send_packet(conn, buffer, len + 4);
+
+	cw_dbg(DBG_DTLS_BIO, "SSL BIO write: %d bytes, rc=%d, ptr: %p", len, rc, data);
+	cw_dbg_dmp(DBG_DTLS_BIO_DMP,(uint8_t*)data,len,"Dump ...");
+
+	if (rc < 0)
+		return rc;
+	return rc - 4;
+}
+