I couldn't even connect over USB and I emailed them about it, they suggested to restart the network interface. At first this didn't seem to work, but I think I just didn't wait long enough. So what now works for me is just bringing the network interface down, bringing it up again and waiting a couple of seconds:

$ sudo ip link set enx00e0993168d7 down
$ sudo ip link set enx00e0993168d7 up
$ ip a show dev enx00e0993168d7
13: enx00e0993168d7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:e0:99:31:68:d7 brd ff:ff:ff:ff:ff:ff
    inet 10.254.239.243/24 brd 10.254.239.255 scope global dynamic noprefixroute enx00e0993168d7
       valid_lft 42632sec preferred_lft 42632sec
    inet6 fe80::9c4a:2259:c022:588/64 scope link noprefixroute
       valid_lft forever preferred_lft forever

After this, I can access the web interface and ssh on 10.254.239.1 over USB. Wi-Fi doesn't seem to work and I didn't look at it because the USB network is fine for me for now.

I created an ESPHome configuration that gets your heart rate from a Bluetooth Low Energy fitness tracker and shows it on the display of an M5Stack Core. For now you need the ESPHome development version and it doesn't work with Wi-Fi because of memory usage of the BLE component, but other than that I find this really cool while working out at home with the heart rate sensor on my wrist:

You can check out the code on my GitHub repository koenvervloesem/ESPHome-Heart-Rate-Display.