Update examples to include using coap_string_tls_version() in usage()

examples/client.c
examples/coap-rd.c
examples/coap-server.c

Add in call to coap_string_tls_version() in usage().

examples/client.c

@@ -523,13 +523,15 @@ message_handler(struct coap_context_t *ctx,
 static void
 usage( const char *program, const char *version) {
   const char *p;
+  char buffer[64];
 
   p = strrchr( program, '/' );
   if ( p )
     program = ++p;
 
   fprintf( stderr, "%s v%s -- a small CoAP implementation\n"
-     "(c) 2010-2015 Olaf Bergmann <bergmann@tzi.org>\n\n"
+     "(c) 2010-2018 Olaf Bergmann <bergmann@tzi.org>\n\n"
+     "%s\n\n"
      "Usage: %s [-a addr] [-b [num,]size] [-c certfile] [-C cafile] [-e text]\n"
      "\t\t[-f file] [-k key] [-l loss] [-m method] [-o file]\n"
      "\t\t[-p port] [-r] [-s duration] [-t type]  [-u user]\n"
@@ -591,7 +593,8 @@ usage( const char *program, const char *version) {
      "\tcoap-client -m get coap://[::1]/.well-known/core\n"
      "\tcoap-client -m get -T cafe coap://[::1]/time\n"
      "\techo -n 1000 | coap-client -m put -T cafe coap://[::1]/time -f -\n"
-     ,program, version, program, wait_seconds);
+     ,program, version, coap_string_tls_version(buffer, sizeof(buffer))
+     ,program, wait_seconds);
 }
 
 typedef struct {

examples/coap-rd.c

@@ -552,6 +552,7 @@ init_resources(coap_context_t *ctx) {
 static void
 usage( const char *program, const char *version) {
   const char *p;
+  char buffer[64];
 
   p = strrchr( program, '/' );
   if ( p )
@@ -559,11 +560,13 @@ usage( const char *program, const char *version) {
 
   fprintf( stderr, "%s v%s -- CoRE Resource Directory implementation\n"
      "(c) 2011-2012 Olaf Bergmann <bergmann@tzi.org>\n\n"
+     "%s\n\n"
      "usage: %s [-A address] [-p port]\n\n"
      "\t-A address\tinterface address to bind to\n"
      "\t-p port\t\tlisten on specified port\n"
      "\t-v num\t\tverbosity level (default: 3)\n",
-     program, version, program );
+     program, version, coap_string_tls_version(buffer, sizeof(buffer)),
+     program);
 }
 
 static coap_context_t *

examples/coap-server.c

@@ -709,6 +709,7 @@ fill_keystore(coap_context_t *ctx) {
 static void
 usage( const char *program, const char *version) {
   const char *p;
+  char buffer[64];
 
   p = strrchr( program, '/' );
   if ( p )
@@ -716,6 +717,7 @@ usage( const char *program, const char *version) {
 
   fprintf( stderr, "%s v%s -- a small CoAP implementation\n"
      "(c) 2010,2011,2015-2018 Olaf Bergmann <bergmann@tzi.org>\n\n"
+     "%s\n\n"
      "Usage: %s [-A address] [-g group] [-p port] [-l loss] [-c certfile]\n"
      "\t\t[-C cafile] [-R root_cafile] [-k key] [-h hint] [-N]\n"
      "\t\t[-v num] [-d max]\n\n"
@@ -756,7 +758,8 @@ usage( const char *program, const char *version) {
      "\t-d max \t\tAllow dynamic creation of up to a total of max resources.\n"
      "\t       \t\tIf max is reached, a 4.06 code is returned until one of the\n"
      "\t       \t\tdynamic resources has been deleted\n",
-    program, version, program );
+    program, version, coap_string_tls_version(buffer, sizeof(buffer)),
+    program);
 }
 
 static coap_context_t *