iridium: close and open the port during disconnection

The Iridium modem doesn't seem to like only the port flashing during the
disconnection, so we fully close and open again the port.

plugins/mm-bearer-iridium.c

@@ -299,6 +299,38 @@ primary_flash_ready (MMSerialPort *port,
     g_object_unref (result);
 }
 
+static gboolean
+after_disconnect_sleep_cb (GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    MMAtSerialPort *primary;
+    MMBearer *self;
+    MMBaseModem *modem;
+
+    self = MM_BEARER (g_async_result_get_source_object (G_ASYNC_RESULT (simple)));
+    g_object_get (self,
+                  MM_BEARER_MODEM, &modem,
+                  NULL);
+    primary = mm_base_modem_get_port_primary (modem);
+
+    /* Propagate errors when reopening the port */
+    if (!mm_serial_port_open (MM_SERIAL_PORT (primary), &error)) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+    } else {
+        mm_serial_port_flash (MM_SERIAL_PORT (primary),
+                              1000,
+                              TRUE,
+                              (MMSerialFlashFn)primary_flash_ready,
+                              simple);
+    }
+
+    g_object_unref (modem);
+    g_object_unref (self);
+    return FALSE;
+}
+
 static void
 disconnect (MMBearer *self,
             GAsyncReadyCallback callback,
@@ -331,11 +363,15 @@ disconnect (MMBearer *self,
                                         callback,
                                         user_data,
                                         disconnect);
-    mm_serial_port_flash (MM_SERIAL_PORT (primary),
-                          1000,
-                          TRUE,
-                          (MMSerialFlashFn)primary_flash_ready,
-                          result);
+
+    /* When we enable the modem we kept one open count in the primary port.
+     * We now need to fully close that one, as if we were disabled, and reopen
+     * it again afterwards. */
+    mm_serial_port_close (MM_SERIAL_PORT (primary));
+    g_warn_if_fail (!mm_serial_port_is_open (MM_SERIAL_PORT (primary)));
+
+    mm_dbg ("Waiting some seconds before reopening the port...");
+    g_timeout_add_seconds (5, (GSourceFunc)after_disconnect_sleep_cb, result);
 }
 
 /*****************************************************************************/