I wanted to develop and test code faster and thought of trying out renode at first. It already had support for NRF52 and I was able to add the memory display support but it was very slow. So at the end I switched to qemu. I had to implement quite a few things from scratch but at the end it worked like a charm. Zephyr also has support for running tests on a qemu machine which helped a lot to verify functionality. The goal was to be able to use the same binary which works on the actual board in qemu as well.