client: Sort options alphabetically, ping is TCP only.

examples/client.c

@@ -514,7 +514,7 @@ usage( const char *program, const char *version) {
      "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"
-     "\t\t[-v num] [-A type] [-B seconds] [-N] [-O num,text] [-K interval]\n"
+     "\t\t[-v num] [-A type] [-B seconds] [-K interval] [-N] [-O num,text]\n"
      "\t\t[-P addr[:port]] [-R root_cafile] [-T token] [-U] URI\n\n"
      "\tURI can be an absolute URI or a URI prefixed with scheme and host\n\n"
      "\t-a addr\t\tThe local interface address to use\n"
@@ -553,7 +553,7 @@ usage( const char *program, const char *version) {
      "\t       \t\tcommand line the same filename for both the certfile and\n"
      "\t       \t\tcafile (as in  '-c certfile -C certfile') to trigger\n"
      "\t       \t\tvalidation\n"
-     "\t-K interval\tsend a ping after interval seconds of inactivity\n"
+     "\t-K interval\tsend a ping after interval seconds of inactivity (TCP only)\n"
      "\t-N     \t\tSend NON-confirmable message\n"
      "\t-O num,text\tAdd option num with contents text to request\n"
      "\t-P addr[:port]\tUse proxy (automatically adds Proxy-Uri option to\n"

man/coap-client.txt.in

@@ -17,9 +17,9 @@ SYNOPSIS
 *coap-client* [*-a* addr] [*-b* [num,]size] [*-c* certfile] [*-e* text]
               [*-f* file] [*-k* key] [*-l* loss] [*-m* method] [*-o* file]
               [*-p* port] [*-r*] [*-s* duration] [*-t* type]  [*-u* user]
-              [*-v* num] [*-A* type] [*-B* seconds] [*-C* cafile] [*-N*]
-              [*-O* num,text] [*-P* addr[:port]] [*-R* root_cafile]
-              [*-T* token] [*-U*] URI
+              [*-v* num] [*-A* type] [*-B* seconds] [*-C* cafile]
+              [*-K* interval] [*-N*] [*-O* num,text] [*-P* addr[:port]]
+              [*-R* root_cafile] [*-T* token] [*-U*] URI
 
 DESCRIPTION
 -----------
@@ -127,6 +127,10 @@ OPTIONS
   have on the command line the same filename for both the certfile and cafile
   (as in  *-c certfile -C certfile*) to trigger validation.
 
+*-K* interval::
+   Send a ping after interval seconds of inactivity (TCP only).
+   If not specified, keep-alive is disabled (default).
+
 *-N* ::
    Send NON-confirmable message. If option *-N* is not specified, a
    confirmable message will be sent.