lte/alt1250: Correspond to ALT1250_EVTBIT_RESTARTAPI event

If the ALT1250_EVTBIT_RESTARTAPI event is received,
the ALT1250 daemon changes its state to handle LAPI normally.

lte/alt1250/alt1250_devevent.c

@@ -298,6 +298,19 @@ static void perform_alt1250_apistopevt(FAR struct alt1250_s *dev)
   altdevice_powerresponse(dev->altfd, LTE_CMDID_STOPAPI, ret);
 }
 
+/****************************************************************************
+ * Name: perform_alt1250_restartevt
+ ****************************************************************************/
+
+static void perform_alt1250_restartevt(FAR struct alt1250_s *dev)
+{
+  /* All LTE API/Socket requests must be available. */
+
+  alt1250_set_api_enable(dev, true);
+
+  altdevice_powerresponse(dev->altfd, LTE_CMDID_RESTARTAPI, OK);
+}
+
 /****************************************************************************
  * Name: perform_alt1250_suspendevt
  ****************************************************************************/
@@ -398,6 +411,12 @@ int perform_alt1250events(FAR struct alt1250_s *dev)
 
       perform_alt1250_apistopevt(dev);
     }
+  else if (bitmap & ALT1250_EVTBIT_RESTARTAPI)
+    {
+      /* Handling API restart request */
+
+      perform_alt1250_restartevt(dev);
+    }
   else if (bitmap & ALT1250_EVTBIT_SUSPEND)
     {
       /* Handling Suspend request */