Add a Eurolite serial number check

This MR adds an option 'eurolite_serials' to the usb dmx plugin. This option accepts
a comma separated list of serial numbers that are assumed to be Eurolite mk2 devices
(as long as their product and vendor ids also match).

This allows finding the Eurolite MK2 without enabling the 'enable_eurolite_mk2' option.
The advantage is that is avoids the conflicts that 'enable_eurolite_mk2' produces
with other plugins. These
conflicts make it impossible to connect the mk2 simultaneously together with most other
interfaces to have multiple universes and/or input universes.

I have tested this by connecting an Enttec pro together with the Eurolite Mk2, and this
works.

plugins/usbdmx/EuroliteProFactory.cpp

@@ -24,6 +24,8 @@
 #include "ola/Logging.h"
 #include "ola/base/Flags.h"
 
+#include <algorithm>
+
 DECLARE_bool(use_async_libusb);
 
 namespace ola {
@@ -46,12 +48,15 @@ const uint16_t EuroliteProFactory::VENDOR_ID_MK2 = 0x0403;
 
 const char EuroliteProFactory::ENABLE_EUROLITE_MK2_KEY[] =
     "enable_eurolite_mk2";
+const char EuroliteProFactory::EUROLITE_SERIALS_KEY[] =
+    "eurolite_serials";
 
 EuroliteProFactory::EuroliteProFactory(ola::usb::LibUsbAdaptor *adaptor,
                                        Preferences *preferences)
   : BaseWidgetFactory<class EurolitePro>("EuroliteProFactory"),
     m_adaptor(adaptor),
     m_enable_eurolite_mk2(IsEuroliteMk2Enabled(preferences)) {
+  StringSplit(preferences->GetValue(EUROLITE_SERIALS_KEY), m_expected_eurolite_serials, ",");
 }
 
 bool EuroliteProFactory::IsEuroliteMk2Enabled(Preferences *preferences) {
@@ -88,12 +93,16 @@ bool EuroliteProFactory::DeviceAdded(
   // Eurolite USB-DMX512-PRO MK2?
   } else if (descriptor.idVendor == VENDOR_ID_MK2 &&
              descriptor.idProduct == PRODUCT_ID_MK2) {
-    if (m_enable_eurolite_mk2) {
-      OLA_INFO << "Found a possible new Eurolite USB-DMX512-PRO MK2 device";
-      LibUsbAdaptor::DeviceInformation info;
-      if (!m_adaptor->GetDeviceInfo(usb_device, descriptor, &info)) {
-        return false;
-      }
+
+    LibUsbAdaptor::DeviceInformation info;
+    if (!m_adaptor->GetDeviceInfo(usb_device, descriptor, &info)) {
+      return false;
+    }
+
+    const bool serial_matches = std::find(m_expected_eurolite_serials.begin(), m_expected_eurolite_serials.end(), info.serial) != m_expected_eurolite_serials.end();
+
+    if (m_enable_eurolite_mk2 || serial_matches) {
+      OLA_INFO << "Found a possible new Eurolite USB-DMX512-PRO MK2 device with serial " << info.serial;
 
       if (!m_adaptor->CheckManufacturer(EXPECTED_MANUFACTURER_MK2, info)) {
         return false;
@@ -104,9 +113,12 @@ bool EuroliteProFactory::DeviceAdded(
       }
       is_mk2 = true;
     } else {
-      OLA_INFO << "Connected FTDI device could be a Eurolite "
-               << "USB-DMX512-PRO MK2 but was ignored, because "
-               << ENABLE_EUROLITE_MK2_KEY << " was false.";
+      OLA_INFO << "Connected FTDI device with serial " << info.serial
+               << " could be a Eurolite USB-DMX512-PRO MK2 but was "
+               << "ignored, because "
+               << ENABLE_EUROLITE_MK2_KEY << " was false and "
+               << "its serial number was not in the "
+               << "configuration.";
       return false;
     }
   } else {

plugins/usbdmx/EuroliteProFactory.h

@@ -46,10 +46,12 @@ class EuroliteProFactory : public BaseWidgetFactory<class EurolitePro> {
   static bool IsEuroliteMk2Enabled(Preferences *preferences);
 
   static const char ENABLE_EUROLITE_MK2_KEY[];
+  static const char EUROLITE_SERIALS_KEY[];
 
  private:
   ola::usb::LibUsbAdaptor *m_adaptor;
   bool m_enable_eurolite_mk2;
+  std::vector<std::string> m_expected_eurolite_serials;
 
   static const uint16_t PRODUCT_ID;
   static const uint16_t VENDOR_ID;