React Native Android Bridge Error: Must be called on main thread

I am using the Sumup SDK to create a bridge to React Native. Most of the hard work is done but I am trying to call a specific function to wake up the card reader before a transaction is processed.

The original code I had was this:

@ReactMethod
    public void prepareCardTerminal() {
        SumUpAPI.prepareForCheckout();
    }
}

The RN bridge then calls this function like this:

static prepareCardTerminal() {
    NativeRNSumup.prepareCardTerminal();
}

How ever this gives me a React Native error of:

Must be called on main thread

I read that this could mean it needs to be run on the UI thread so I rewrote the function to be:

@ReactMethod
public void prepareCardTerminal() {
    new Thread(new Runnable() {
        public void run() {
    SumUpAPI.prepareForCheckout();
        }
    });
}

However this doesn't have the intended results (even though it doesn't show any errors).

Any tips would be much appreciated.

Edit: I found a solution to this issue. I used UiThreadUtil:

import com.facebook.react.bridge.UiThreadUtil;
...
    @ReactMethod
public void prepareCardTerminal() {
    UiThreadUtil.runOnUiThread(new Runnable() {
        @Override
        public void run() {
    SumUpAPI.prepareForCheckout();
        }
    });
}