conncheck: send keepalive for candidates until connected state

We can start sending keepalive stun request for the selected pair, and
stop sending keepalive for candidates as soon as the conncheck reaches
state connected and not ready.

agent/conncheck.c

@@ -1624,8 +1624,14 @@ static gboolean priv_conn_keepalive_tick_unlocked (NiceAgent *agent)
                   p->local->sockptr, &p->remote->addr);
             }
 
-            nice_debug ("Agent %p : stun_bind_keepalive for pair %p res %d.",
-                agent, p, (int) buf_len);
+            if (nice_debug_is_enabled ()) {
+              gchar tmpbuf[INET6_ADDRSTRLEN];
+              nice_address_to_string (&p->remote->addr, tmpbuf);
+              nice_debug ("Agent %p : stun_bind_keepalive to %s:%u "
+                "in s%d/c%d.", agent,
+                tmpbuf, nice_address_get_port (&p->remote->addr),
+                stream->id, component->id);
+            }
           } else {
             ++errors;
           }
@@ -1640,7 +1646,7 @@ static gboolean priv_conn_keepalive_tick_unlocked (NiceAgent *agent)
     NiceStream *stream = i->data;
     for (j = stream->components; j; j = j->next) {
       NiceComponent *component = j->data;
-      if (component->state < NICE_COMPONENT_STATE_READY &&
+      if (component->state < NICE_COMPONENT_STATE_CONNECTED &&
           agent->stun_server_ip) {
         NiceAddress stun_server;
         if (nice_address_set_from_string (&stun_server, agent->stun_server_ip)) {
@@ -1663,8 +1669,14 @@ static gboolean priv_conn_keepalive_tick_unlocked (NiceAgent *agent)
                 nice_address_ip_version (&candidate->addr) ==
                 nice_address_ip_version (&stun_server)) {
               /* send the conncheck */
-              nice_debug ("Agent %p : resending STUN on %s to keep the "
-                  "candidate alive.", agent, candidate->foundation);
+              if (nice_debug_is_enabled ()) {
+                gchar tmpbuf[INET6_ADDRSTRLEN];
+                nice_address_to_string (&candidate->addr, tmpbuf);
+                nice_debug ("Agent %p : resending STUN to keep the local "
+                    "candidate %s:%u alive in s%d/c%d.", agent,
+                    tmpbuf, nice_address_get_port (&candidate->addr),
+                    stream->id, component->id);
+              }
               agent_socket_send (candidate->sockptr, &stun_server,
                   buffer_len, (gchar *)stun_buffer);
             }