Matter Virtual Device

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If you have a chance, please checkout "Matter Virtual Device".

For app developers and others who need to test or emulate a virtual Matter device but lack the resources to build their own physical or virtual Matter device, Google offers the Matter Virtual Device (MVD). MVD is a lightweight standalone Linux desktop tool that simulates different types of virtual Matter devices and provides a graphical user interface to control and display the states of the virtual Matter device.
Unlike a physical Matter device, MVD does not rely on Bluetooth® Low Energy (BLE) or Thread® in order to join a Matter fabric. Instead, it uses the host Linux machine's existing Wi-Fi network connection for commissioning.

I personally always use MVD to test GHSAFM. Make sure to give it a try!