Add option for introducing a delay (in milliseconds) between direct mode LED packets for the QMK OpenRGB protocol

Controllers/QMKOpenRGBController/QMKOpenRGBRev9Controller.cpp

@@ -11,6 +11,8 @@
 
 #include "QMKOpenRGBRev9Controller.h"
 
+using namespace std::chrono_literals;
+
 static std::map<uint8_t, std::string> QMKKeycodeToKeynameMap
 {
     { 0, "" },                  { 1, "Right Fn" },      { 2, "" },                  { 3, "" },
@@ -85,6 +87,15 @@ QMKOpenRGBRev9Controller::QMKOpenRGBRev9Controller(hid_device *dev_handle, const
         leds_per_update = 20;
     }
 
+    if(qmk_settings.contains("delay"))
+    {
+        delay = (unsigned int)qmk_settings["delay"] * 1ms;
+    }
+    else
+    {
+        delay = 0ms;
+    }
+
     dev         = dev_handle;
     location    = path;
 
@@ -451,6 +462,11 @@ void QMKOpenRGBRev9Controller::DirectModeSetLEDs(std::vector<RGBColor> colors, u
 
         hid_write(dev, usb_buf, 65);
 
+        if(delay > 0ms)
+        {
+            std::this_thread::sleep_for(delay);
+        }
+
         leds_sent += tmp_leds_per_update;
     }
 }