fixes #143 Protocols and transports should be "configurable"

This makes all the protocols and transports optional.  All
of them except ZeroTier are enabled by default, but you can
now disable them (remove from the build) with cmake options.

The test suite is modified so that tests still run as much
as they can, but skip over things caused by missing functionality
from the library (due to configuration).

Further, the constant definitions and prototypes for functions
that are specific to transports or protocols are moved into
appropriate headers, which should be included directly by
applications wishing to use these.

We have also added and improved documentation -- all of the
transports are documented, and several more man pages for
protocols have been added.  (Req/Rep and Surveyor are still
missing.)

1 files changed, 15 insertions, 1 deletions

diff --git a/tests/zt.c b/tests/zt.c
index 562f4ee1..9680f82d 100644
--- a/tests/zt.c
+++ b/tests/zt.c
@@ -9,9 +9,12 @@
 //
 
 #include "convey.h"
+#include "nng.h"
+#include "protocol/pair0/pair.h"
+#include "transport/zerotier/zerotier.h"
 #include "trantest.h"
 
-#include "transport/zerotier/zerotier.h"
+#include "stubs.h"
 
 // zerotier tests.
 
@@ -35,6 +38,10 @@ mkdir(const char *path, int mode)
 #include <unistd.h>
 #endif // WIN32
 
+#ifndef NNG_HAVE_ZEROTIER
+#define nng_zt_network_status_ok 0
+#endif
+
 static int
 check_props(nng_msg *msg, nng_listener l, nng_dialer d)
 {
@@ -197,6 +204,8 @@ TestMain("ZeroTier Transport", {
 		char         addr[NNG_MAXADDRLEN];
 		int          rv;
 
+		So(nng_zt_register() == 0);
+
 		snprintf(addr, sizeof(addr), "zt://" NWID ":%u", port);
 
 		So(nng_pair_open(&s) == 0);
@@ -240,6 +249,8 @@ TestMain("ZeroTier Transport", {
 		// uint64_t   node = 0xb000072fa6ull; // my personal host
 		uint64_t node = 0x2d2f619cccull; // my personal host
 
+		So(nng_zt_register() == 0);
+
 		snprintf(addr, sizeof(addr), "zt://" NWID "/%llx:%u",
 		    (unsigned long long) node, port);
 
@@ -258,6 +269,8 @@ TestMain("ZeroTier Transport", {
 		uint64_t     node1 = 0;
 		uint64_t     node2 = 0;
 
+		So(nng_zt_register() == 0);
+
 		snprintf(addr, sizeof(addr), "zt://" NWID ":%u", port);
 
 		So(nng_pair_open(&s) == 0);
@@ -306,6 +319,7 @@ TestMain("ZeroTier Transport", {
 
 		port = 9944;
 		// uint64_t   node = 0xb000072fa6ull; // my personal host
+		So(nng_zt_register() == 0);
 
 		snprintf(addr1, sizeof(addr1), "zt://" NWID ":%u", port);