diff --git a/programs/ssl/dtls_client.c b/programs/ssl/dtls_client.c
new file mode 100644
index 0000000..90db06c
--- /dev/null
+++ b/programs/ssl/dtls_client.c
@@ -0,0 +1,374 @@
+/*
+ *  Simple DTLS client demonstration program
+ *
+ *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#define mbedtls_printf     printf
+#define mbedtls_fprintf    fprintf
+#define mbedtls_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif
+
+#if !defined(MBEDTLS_SSL_CLI_C) || !defined(MBEDTLS_SSL_PROTO_DTLS) ||    \
+    !defined(MBEDTLS_NET_C)  || !defined(MBEDTLS_TIMING_C) ||             \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) ||        \
+    !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_RSA_C) ||      \
+    !defined(MBEDTLS_CERTS_C) || !defined(MBEDTLS_PEM_PARSE_C)
+int main( void )
+{
+    mbedtls_printf( "MBEDTLS_SSL_CLI_C and/or MBEDTLS_SSL_PROTO_DTLS and/or "
+            "MBEDTLS_NET_C and/or MBEDTLS_TIMING_C and/or "
+            "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or "
+            "MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_RSA_C and/or "
+            "MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C not defined.\n" );
+    return( 0 );
+}
+#else
+
+#include <string.h>
+
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/debug.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/error.h"
+#include "mbedtls/certs.h"
+#include "mbedtls/timing.h"
+
+/* Uncomment out the following line to default to IPv4 and disable IPv6 */
+//#define FORCE_IPV4
+
+#define SERVER_PORT "4433"
+#define SERVER_NAME "localhost"
+
+#ifdef FORCE_IPV4
+#define SERVER_ADDR "127.0.0.1"     /* Forces IPv4 */
+#else
+#define SERVER_ADDR "::1"
+#endif
+
+#define MESSAGE     "Echo this"
+
+#define READ_TIMEOUT_MS 1000
+#define MAX_RETRY       5
+
+#define DEBUG_LEVEL 0
+
+#if defined(MBEDTLS_CHECK_PARAMS)
+#include "mbedtls/platform_util.h"
+void mbedtls_param_failed( const char *failure_condition,
+                           const char *file,
+                           int line )
+{
+    mbedtls_printf( "%s:%i: Input param failed - %s\n",
+                    file, line, failure_condition );
+    mbedtls_exit( MBEDTLS_EXIT_FAILURE );
+}
+#endif
+
+static void my_debug( void *ctx, int level,
+                      const char *file, int line,
+                      const char *str )
+{
+    ((void) level);
+
+    mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
+    fflush(  (FILE *) ctx  );
+}
+
+int main( int argc, char *argv[] )
+{
+    int ret, len;
+    mbedtls_net_context server_fd;
+    uint32_t flags;
+    unsigned char buf[1024];
+    const char *pers = "dtls_client";
+    int retry_left = MAX_RETRY;
+
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    mbedtls_x509_crt cacert;
+    mbedtls_timing_delay_context timer;
+
+    ((void) argc);
+    ((void) argv);
+
+#if defined(MBEDTLS_DEBUG_C)
+    mbedtls_debug_set_threshold( DEBUG_LEVEL );
+#endif
+
+    /*
+     * 0. Initialize the RNG and the session data
+     */
+    mbedtls_net_init( &server_fd );
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    mbedtls_x509_crt_init( &cacert );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+    mbedtls_printf( "\n  . Seeding the random number generator..." );
+    fflush( stdout );
+
+    mbedtls_entropy_init( &entropy );
+    if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
+                               (const unsigned char *) pers,
+                               strlen( pers ) ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 0. Load certificates
+     */
+    mbedtls_printf( "  . Loading the CA root certificate ..." );
+    fflush( stdout );
+
+    ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem,
+                          mbedtls_test_cas_pem_len );
+    if( ret < 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n", -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok (%d skipped)\n", ret );
+
+    /*
+     * 1. Start the connection
+     */
+    mbedtls_printf( "  . Connecting to udp/%s/%s...", SERVER_NAME, SERVER_PORT );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_connect( &server_fd, SERVER_ADDR,
+                                         SERVER_PORT, MBEDTLS_NET_PROTO_UDP ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_connect returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 2. Setup stuff
+     */
+    mbedtls_printf( "  . Setting up the DTLS structure..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ssl_config_defaults( &conf,
+                   MBEDTLS_SSL_IS_CLIENT,
+                   MBEDTLS_SSL_TRANSPORT_DATAGRAM,
+                   MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
+        goto exit;
+    }
+
+    /* OPTIONAL is usually a bad choice for security, but makes interop easier
+     * in this simplified example, in which the ca chain is hardcoded.
+     * Production code should set a proper ca chain and use REQUIRED. */
+    mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
+    mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
+    mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+    mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+
+    if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_setup returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_ssl_set_hostname( &ssl, SERVER_NAME ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_set_bio( &ssl, &server_fd,
+                         mbedtls_net_send, mbedtls_net_recv, mbedtls_net_recv_timeout );
+
+    mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
+                                            mbedtls_timing_get_delay );
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 4. Handshake
+     */
+    mbedtls_printf( "  . Performing the DTLS handshake..." );
+    fflush( stdout );
+
+    do ret = mbedtls_ssl_handshake( &ssl );
+    while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
+           ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_handshake returned -0x%x\n\n", -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 5. Verify the server certificate
+     */
+    mbedtls_printf( "  . Verifying peer X.509 certificate..." );
+
+    /* In real life, we would have used MBEDTLS_SSL_VERIFY_REQUIRED so that the
+     * handshake would not succeed if the peer's cert is bad.  Even if we used
+     * MBEDTLS_SSL_VERIFY_OPTIONAL, we would bail out here if ret != 0 */
+    if( ( flags = mbedtls_ssl_get_verify_result( &ssl ) ) != 0 )
+    {
+        char vrfy_buf[512];
+
+        mbedtls_printf( " failed\n" );
+
+        mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), "  ! ", flags );
+
+        mbedtls_printf( "%s\n", vrfy_buf );
+    }
+    else
+        mbedtls_printf( " ok\n" );
+
+    /*
+     * 6. Write the echo request
+     */
+send_request:
+    mbedtls_printf( "  > Write to server:" );
+    fflush( stdout );
+
+    len = sizeof( MESSAGE ) - 1;
+
+    do ret = mbedtls_ssl_write( &ssl, (unsigned char *) MESSAGE, len );
+    while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
+           ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+
+    if( ret < 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_write returned %d\n\n", ret );
+        goto exit;
+    }
+
+    len = ret;
+    mbedtls_printf( " %d bytes written\n\n%s\n\n", len, MESSAGE );
+
+    /*
+     * 7. Read the echo response
+     */
+    mbedtls_printf( "  < Read from server:" );
+    fflush( stdout );
+
+    len = sizeof( buf ) - 1;
+    memset( buf, 0, sizeof( buf ) );
+
+    do ret = mbedtls_ssl_read( &ssl, buf, len );
+    while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
+           ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+
+    if( ret <= 0 )
+    {
+        switch( ret )
+        {
+            case MBEDTLS_ERR_SSL_TIMEOUT:
+                mbedtls_printf( " timeout\n\n" );
+                if( retry_left-- > 0 )
+                    goto send_request;
+                goto exit;
+
+            case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
+                mbedtls_printf( " connection was closed gracefully\n" );
+                ret = 0;
+                goto close_notify;
+
+            default:
+                mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n\n", -ret );
+                goto exit;
+        }
+    }
+
+    len = ret;
+    mbedtls_printf( " %d bytes read\n\n%s\n\n", len, buf );
+
+    /*
+     * 8. Done, cleanly close the connection
+     */
+close_notify:
+    mbedtls_printf( "  . Closing the connection..." );
+
+    /* No error checking, the connection might be closed already */
+    do ret = mbedtls_ssl_close_notify( &ssl );
+    while( ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+    ret = 0;
+
+    mbedtls_printf( " done\n" );
+
+    /*
+     * 9. Final clean-ups and exit
+     */
+exit:
+
+#ifdef MBEDTLS_ERROR_C
+    if( ret != 0 )
+    {
+        char error_buf[100];
+        mbedtls_strerror( ret, error_buf, 100 );
+        mbedtls_printf( "Last error was: %d - %s\n\n", ret, error_buf );
+    }
+#endif
+
+    mbedtls_net_free( &server_fd );
+
+    mbedtls_x509_crt_free( &cacert );
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+
+#if defined(_WIN32)
+    mbedtls_printf( "  + Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    /* Shell can not handle large exit numbers -> 1 for errors */
+    if( ret < 0 )
+        ret = 1;
+
+    return( ret );
+}
+#endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_PROTO_DTLS && MBEDTLS_NET_C &&
+          MBEDTLD_TIMING_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C &&
+          MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_RSA_C && MBEDTLS_CERTS_C &&
+          MBEDTLS_PEM_PARSE_C */