diff --git a/programs/ssl/dtls_client.c b/programs/ssl/dtls_client.c
index 0b837ba..e753db2 100644
--- a/programs/ssl/dtls_client.c
+++ b/programs/ssl/dtls_client.c
@@ -35,18 +35,14 @@
 #endif
 
 #if !defined(MBEDTLS_SSL_CLI_C) || !defined(MBEDTLS_SSL_PROTO_DTLS) ||    \
-    !defined(MBEDTLS_NET_C) ||                                             \
+    !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)
-
-int main( int argc, char *argv[] )
+int main( void )
 {
-    ((void) argc);
-    ((void) argv);
-
     mbedtls_printf( "MBEDTLS_SSL_CLI_C and/or MBEDTLS_SSL_PROTO_DTLS and/or "
-            "MBEDTLS_NET_C 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" );
@@ -95,6 +91,7 @@
     mbedtls_ssl_context ssl;
     mbedtls_ssl_config conf;
     mbedtls_x509_crt cacert;
+    mbedtls_timing_delay_context timer;
 
     ((void) argc);
     ((void) argv);
@@ -194,6 +191,9 @@
     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" );
 
     /*
@@ -342,6 +342,6 @@
     return( ret );
 }
 #endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_PROTO_DTLS && MBEDTLS_NET_C &&
-          MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_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 */
diff --git a/programs/ssl/dtls_server.c b/programs/ssl/dtls_server.c
index 40416be..a44ae0b 100644
--- a/programs/ssl/dtls_server.c
+++ b/programs/ssl/dtls_server.c
@@ -29,6 +29,7 @@
 #if defined(MBEDTLS_PLATFORM_C)
 #include "mbedtls/platform.h"
 #else
+#include <stdio.h>
 #define mbedtls_printf     printf
 #define mbedtls_fprintf    fprintf
 #endif
@@ -37,16 +38,17 @@
     !defined(MBEDTLS_SSL_COOKIE_C) || !defined(MBEDTLS_NET_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)
+    !defined(MBEDTLS_CERTS_C) || !defined(MBEDTLS_PEM_PARSE_C) ||         \
+    !defined(MBEDTLS_TIMING_C)
 
-#include <stdio.h>
 int main( void )
 {
     printf( "MBEDTLS_SSL_SRV_C and/or MBEDTLS_SSL_PROTO_DTLS and/or "
             "MBEDTLS_SSL_COOKIE_C and/or MBEDTLS_NET_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" );
+            "MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C and/or "
+            "MBEDTLS_TIMING_C not defined.\n" );
     return( 0 );
 }
 #else
@@ -100,6 +102,7 @@
     mbedtls_ssl_config conf;
     mbedtls_x509_crt srvcert;
     mbedtls_pk_context pkey;
+    mbedtls_timing_delay_context timer;
 #if defined(MBEDTLS_SSL_CACHE_C)
     mbedtls_ssl_cache_context cache;
 #endif
@@ -232,6 +235,9 @@
         goto exit;
     }
 
+    mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
+                                            mbedtls_timing_get_delay );
+
     printf( " ok\n" );
 
 reset:
@@ -419,4 +425,4 @@
 #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_PROTO_DTLS &&
           MBEDTLS_SSL_COOKIE_C && MBEDTLS_NET_C && MBEDTLS_ENTROPY_C &&
           MBEDTLS_CTR_DRBG_C && MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_RSA_C
-          && MBEDTLS_CERTS_C && MBEDTLS_PEM_PARSE_C */
+          && MBEDTLS_CERTS_C && MBEDTLS_PEM_PARSE_C && MBEDTLS_TIMING_C */
diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index ea1e79f..3ed0d29 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -36,9 +36,20 @@
 #define mbedtls_snprintf   snprintf
 #endif
 
-#if defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO) && \
-    defined(MBEDTLS_SSL_TLS_C) && defined(MBEDTLS_SSL_CLI_C) && \
-    defined(MBEDTLS_NET_C) && defined(MBEDTLS_CTR_DRBG_C)
+#if !defined(MBEDTLS_ENTROPY_C) || \
+    !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
+    !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
+    !defined(MBEDTLS_TIMING_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_ENTROPY_C and/or "
+           "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
+           "MBEDTLS_NET_C and/or MBEDTLS_CTR_DRBG_C and/or "
+           "MBEDTLS_TIMING_C not defined.\n");
+    return( 0 );
+}
+#else
+
 #include "mbedtls/net.h"
 #include "mbedtls/ssl.h"
 #include "mbedtls/entropy.h"
@@ -47,15 +58,11 @@
 #include "mbedtls/x509.h"
 #include "mbedtls/error.h"
 #include "mbedtls/debug.h"
+#include "mbedtls/timing.h"
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#endif
-
-#if defined(MBEDTLS_TIMING_C)
-#include "mbedtls/timing.h"
-#endif
 
 #if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32)
 #if !defined  snprintf
@@ -159,13 +166,6 @@
 #define USAGE_RECSPLIT
 #endif
 
-#if defined(MBEDTLS_TIMING_C)
-#define USAGE_TIME \
-    "    reco_delay=%%d       default: 0 seconds\n"
-#else
-#define USAGE_TIME ""
-#endif /* MBEDTLS_TIMING_C */
-
 #if defined(MBEDTLS_SSL_ALPN)
 #define USAGE_ALPN \
     "    alpn=%%s             default: \"\" (disabled)\n"   \
@@ -239,7 +239,7 @@
     USAGE_RENEGO                                            \
     "    exchanges=%%d        default: 1\n"                 \
     "    reconnect=%%d        default: 0 (disabled)\n"      \
-    USAGE_TIME                                              \
+    "    reco_delay=%%d       default: 0 seconds\n"         \
     USAGE_TICKETS                                           \
     USAGE_MAX_FRAG_LEN                                      \
     USAGE_TRUNC_HMAC                                        \
@@ -258,17 +258,6 @@
     "    force_ciphersuite=<name>    default: all enabled\n"\
     " acceptable ciphersuite names:\n"
 
-#if !defined(MBEDTLS_ENTROPY_C) ||  !defined(MBEDTLS_FS_IO) || \
-    !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
-    !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_CTR_DRBG_C)
-int main( void )
-{
-    mbedtls_printf("MBEDTLS_ENTROPY_C and/or "
-           "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
-           "MBEDTLS_NET_C and/or MBEDTLS_CTR_DRBG_C not defined.\n");
-    return( 0 );
-}
-#else
 /*
  * global options
  */
@@ -403,6 +392,7 @@
     mbedtls_ssl_context ssl;
     mbedtls_ssl_config conf;
     mbedtls_ssl_session saved_session;
+    mbedtls_timing_delay_context timer;
 #if defined(MBEDTLS_X509_CRT_PARSE_C)
     uint32_t flags;
     mbedtls_x509_crt cacert;
@@ -1198,6 +1188,9 @@
 #endif
                 );
 
+    mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
+                                            mbedtls_timing_get_delay );
+
     mbedtls_printf( " ok\n" );
 
     /*
@@ -1495,10 +1488,8 @@
 
         mbedtls_net_close( server_fd );
 
-#if defined(MBEDTLS_TIMING_C)
         if( opt.reco_delay > 0 )
             mbedtls_timing_m_sleep( 1000 * opt.reco_delay );
-#endif
 
         mbedtls_printf( "  . Reconnecting with saved session..." );
         fflush( stdout );
@@ -1589,4 +1580,4 @@
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
           MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
-          MBEDTLS_CTR_DRBG_C */
+          MBEDTLS_CTR_DRBG_C && MBEDTLS_TIMING_C */
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index 300dd87..7a947ed 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -36,17 +36,20 @@
 #define mbedtls_printf     printf
 #endif
 
-#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) && defined(MBEDTLS_FS_IO)
-#define SNI_OPTION
-#endif
+#if !defined(MBEDTLS_ENTROPY_C) || \
+    !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_SRV_C) || \
+    !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
+    !defined(MBEDTLS_TIMING_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_ENTROPY_C and/or "
+           "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
+           "MBEDTLS_NET_C and/or MBEDTLS_CTR_DRBG_C and/or "
+           "MBEDTLS_TIMING_C not defined.\n");
+    return( 0 );
+}
+#else
 
-#if defined(_WIN32)
-#include <windows.h>
-#endif
-
-#if defined(MBEDTLS_ENTROPY_C) && \
-    defined(MBEDTLS_SSL_TLS_C) && defined(MBEDTLS_SSL_SRV_C) && \
-    defined(MBEDTLS_NET_C) && defined(MBEDTLS_CTR_DRBG_C)
 #include "mbedtls/net.h"
 #include "mbedtls/ssl.h"
 #include "mbedtls/entropy.h"
@@ -59,7 +62,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#endif
 
 #if !defined(_WIN32)
 #include <signal.h>
@@ -77,6 +79,14 @@
 #include "mbedtls/memory_buffer_alloc.h"
 #endif
 
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) && defined(MBEDTLS_FS_IO)
+#define SNI_OPTION
+#endif
+
+#if defined(_WIN32)
+#include <windows.h>
+#endif
+
 #define DFL_SERVER_ADDR         NULL
 #define DFL_SERVER_PORT         4433
 #define DFL_DEBUG_LEVEL         0
@@ -327,18 +337,6 @@
     "    force_ciphersuite=<name>    default: all enabled\n"            \
     " acceptable ciphersuite names:\n"
 
-#if !defined(MBEDTLS_ENTROPY_C) || \
-    !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_SRV_C) || \
-    !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_CTR_DRBG_C)
-#include <stdio.h>
-int main( void )
-{
-    mbedtls_printf("MBEDTLS_ENTROPY_C and/or "
-           "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
-           "MBEDTLS_NET_C and/or MBEDTLS_CTR_DRBG_C not defined.\n");
-    return( 0 );
-}
-#else
 /*
  * global options
  */
@@ -722,6 +720,7 @@
     mbedtls_ctr_drbg_context ctr_drbg;
     mbedtls_ssl_context ssl;
     mbedtls_ssl_config conf;
+    mbedtls_timing_delay_context timer;
 #if defined(MBEDTLS_SSL_RENEGOTIATION)
     unsigned char renego_period[8] = { 0 };
 #endif
@@ -1752,6 +1751,9 @@
 #endif
                 );
 
+    mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
+                                            mbedtls_timing_get_delay );
+
     mbedtls_printf( " ok\n" );
 
 reset:
@@ -2226,4 +2228,4 @@
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
           MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
-          MBEDTLS_CTR_DRBG_C */
+          MBEDTLS_CTR_DRBG_C && MBEDTLS_TIMING_C */