From 97ae66e231d66c55e470e318f20402218372e544 Mon Sep 17 00:00:00 2001
From: Kevin Matz <kevin@company235.com>
Date: Thu, 6 Apr 2023 09:44:54 -0400
Subject: [PATCH] Only consider the port to be open if a serial number can be
 read within 500 milliseconds.

---
 protocol/enttec/dmx-usb-pro/widget.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/protocol/enttec/dmx-usb-pro/widget.cpp b/protocol/enttec/dmx-usb-pro/widget.cpp
index 9447c3f..ee0e94a 100644
--- a/protocol/enttec/dmx-usb-pro/widget.cpp
+++ b/protocol/enttec/dmx-usb-pro/widget.cpp
@@ -86,8 +86,11 @@ void Widget::halt()
  */
 void Widget::open()
 {
-  std::scoped_lock lock(mtx_metadata_);
-  usb_mode_ = USBhost;
+  if (getSerialNumber(500))                 // check for valid call/response from device
+  {
+      std::scoped_lock lock(mtx_metadata_);
+      usb_mode_ = USBhost;                   // note connected state
+  }
 }