commander: add COM_OBC_LOSS_T for setting onboard computer loss time-out

src/modules/commander/commander_params.c

@@ -388,6 +388,17 @@ PARAM_DEFINE_INT32(COM_OBL_ACT, 0);
  */
 PARAM_DEFINE_INT32(COM_OBL_RC_ACT, 0);
 
+/**
+ * Time-out to wait when onboard computer connection is lost before warning about loss connection.
+ *
+ * @group Commander
+ * @unit s
+ * @min 0
+ * @max 60
+ * @increment 0.01
+ */
+PARAM_DEFINE_FLOAT(COM_OBC_LOSS_T, 5.0f);
+
 /**
  * First flightmode slot (1000-1160)
  *