Aren't there tons of situations where you'd see >250 BLE devices? Seems to me that fixing the software to not crash should also be a very, very high priority...

Aren't there tons of situations where you'd see >250 BLE devices? Seems to me that fixing the software to not crash should also be a very, very high priority... But yeah, chambers can be real cheap. My standard is a trash-picked microwave oven, with the magnetron and trafo removed to make it a lot lighter weight. The door is perfect, the isolation is already great at 2.4GHz, there's even a window so you can see status lights.