How to change mouse settings programmatically in macOS using IOKit - objective-c

Question

The functions IOHIDGetAccelerationWithKey and IOHIDSetAccelerationWithKey are deprecated since macOS 10.12, therefore I am trying to implement the same using other IO*-methods.
I have never worked with IOKit, thus, all I can do is google for functions and try to get it to work.
Now I found this: Can't edit IORegistryEntry which has an example of how to change TrackpadThreeFingerSwipe property, however it is using a function which is not defined for me: getEVSHandle. Googling for it reveals only that it should be Found in the MachineSettings framework, however I can't seem to add any "MachineSettings" framework in Xcode 11.
What should I do? Current code is like:
#import <Foundation/Foundation.h>
#import <IOKit/hidsystem/IOHIDLib.h>
int main(int argc, const char * argv[]) {
#autoreleasepool {
NSInteger value = -65536;
CFNumberRef number = CFNumberCreate(kCFAllocatorDefault, kCFNumberNSIntegerType, &value);
CFMutableDictionaryRef propertyDict = CFDictionaryCreateMutable(kCFAllocatorDefault, 1, NULL, NULL);
CFDictionarySetValue(propertyDict, #"HIDMouseAcceleration", number);
io_connect_t connect = getEVSHandle(); // ???
if (!connect)
{
NSLog(#"Unable to get EVS handle");
}
res = IOConnectSetCFProperties(connect, propertyDict);
if (res != KERN_SUCCESS)
{
NSLog(#"Failed to set mouse acceleration (%d)", res);
}
IOObjectRelease(service);
CFRelease(propertyDict);
}
return 0;
}

Answer 1

The following works (tested with Xcode 11.2 / macOS 10.15)
#import <Foundation/Foundation.h>
#import <IOKit/hidsystem/IOHIDLib.h>
int main(int argc, const char * argv[]) {
#autoreleasepool {
io_service_t service = IORegistryEntryFromPath(kIOMasterPortDefault,
kIOServicePlane ":/IOResources/IOHIDSystem");
NSDictionary *parameters = (__bridge NSDictionary *)IORegistryEntryCreateCFProperty(service,
CFSTR(kIOHIDParametersKey), kCFAllocatorDefault, kNilOptions);
NSLog(#"%#", parameters);
NSMutableDictionary *newParameters = [parameters mutableCopy];
newParameters[#"HIDMouseAcceleration"] = #(12345);
kern_return_t result = IORegistryEntrySetCFProperty(service,
CFSTR(kIOHIDParametersKey), (__bridge CFDictionaryRef)newParameters);
NSLog(kIOReturnSuccess == result ? #"Updated" : #"Failed");
IOObjectRelease(service);
}
return 0;
}