bearer,3gpp: dial operation specifies which data port to use

Instead of deciding in advance which data port to use, we let the dialling
operation gather it. For the generic dialling logic, ATD-based, always an
'AT' port will be used as data port, even if we grabbed a 'net' port. Those
plugins that can work with 'net' ports will grab the specific 'net' port
themselves.

src/mm-base-modem.c

@@ -699,16 +699,18 @@ mm_base_modem_peek_port_qmi_for_data (MMBaseModem *self,
 #endif /* WITH_QMI */
 
 MMPort *
-mm_base_modem_get_best_data_port (MMBaseModem *self)
+mm_base_modem_get_best_data_port (MMBaseModem *self,
+                                  MMPortType type)
 {
     MMPort *port;
 
-    port = mm_base_modem_peek_best_data_port (self);
+    port = mm_base_modem_peek_best_data_port (self, type);
     return (port ? g_object_ref (port) : NULL);
 }
 
 MMPort *
-mm_base_modem_peek_best_data_port (MMBaseModem *self)
+mm_base_modem_peek_best_data_port (MMBaseModem *self,
+                                   MMPortType type)
 {
     GList *l;
 
@@ -716,8 +718,11 @@ mm_base_modem_peek_best_data_port (MMBaseModem *self)
 
     /* Return first not-connected data port */
     for (l = self->priv->data; l; l = g_list_next (l)) {
-        if (!mm_port_get_connected ((MMPort *)l->data))
+        if (!mm_port_get_connected ((MMPort *)l->data) &&
+            (mm_port_get_port_type ((MMPort *)l->data) == type ||
+             type == MM_PORT_TYPE_UNKNOWN)) {
             return (MMPort *)l->data;
+        }
     }
 
     return NULL;