Adapt STUN diagnostics to endpoint profiles and helper sockets

src/transport_layer/stun_nat.c

@@ -656,7 +656,7 @@ static void restart_probe(struct stun_probe* p) {
 static void scan_sources(struct STUN_NAT* mod) {
     for (struct stun_probe* p = mod->probes; p; p = p->next) p->seen = 0;
     for (struct ETCP_SOCKET* sock = mod->inst->etcp_sockets; sock; sock = sock->next) {
-        if (sock->is_tcp) continue;
+        if (sock->is_tcp || sock->probe_only) continue;
         struct stun_source source;
         if (source_snapshot(sock, &source) < 0) continue;
         struct stun_probe** slot = &mod->probes;