Hello,
I have built a new stumbler application for submitting data for cell towers, Wi-Fi access points and Bluetooth beacons to MLS. The application is still work-in-progress and might be a little rough around the edges, but I’ve successfully used it to send data to MLS.
The application is currently only available from GitHub: https://github.com/mjaakko/NeoStumbler
Feel free to try it out and give feedback on it