Merge pull request #518 from mrdeep1/server_port

coap-server: Clarify -p port usage

examples/coap-server.c

@@ -1998,7 +1998,9 @@ usage( const char *program, const char *version) {
      "\t-l loss%%\tRandomly fail to send datagrams with the specified\n"
      "\t       \t\tprobability - 100%% all datagrams, 0%% no datagrams\n"
      "\t       \t\t(for debugging only)\n"
-     "\t-p port\t\tListen on specified port\n"
+     "\t-p port\t\tListen on specified port for UDP and TCP. If (D)TLS is\n"
+     "\t       \t\tenabled, then the coap-server will also listen on\n"
+     "\t       \t\t 'port'+1 for DTLS and TLS.  The default port is 5683\n"
      "\t-v num \t\tVerbosity level (default 3, maximum is 9). Above 7,\n"
      "\t       \t\tthere is increased verbosity in GnuTLS and OpenSSL logging\n"
      "\t-A address\tInterface address to bind to\n"

man/coap-server.txt.in

@@ -171,21 +171,22 @@ EXAMPLES
 ----
 coap-server -A ::1
 ----
-Let the server listen on localhost (port '5683').
+Let the server listen on localhost (port '5683') for UDP/TCP.
 
 * Example
 ----
 coap-server -A ::1 -k mysecretKey -h myhint
 ----
-Let the server listen on localhost (port '5683' and '5684') with the server
-set up for PSK authentication.
+Let the server listen on localhost (port '5683' for UDP/TCP and port '5684' for
+DTLS/TLS) with the server set up for PSK authentication if the client uses
+coaps:// or coaps+tcp://.
 
 * Example
 ----
-coap-server -A ::1 -p 13011
+coap-server -A ::1 -k mysecretKey -h myhint -p 13011
 ----
-The same, except the listening port is '13011' (and not the default port
-'5683').
+The same, except the UDP/TCP listening port is '13011' and the DTLS/TLS
+listening port is '13012' (and not the default ports '5683' and '5684').
 
 * Example
 ----