I just started to use two Metawear sensors, and they did work when connecting from the Android app.
However, some problems are happening when running the Python examples on my Ubuntu 18.04.
The scan_connect.py script doesn't find the devices, while led.py connects, but raises a "buffer overflow" error, as follows:
error 1580812080.589099: Error on line: 296 (src/blestatemachine.cc): Operation now in progress
*** buffer overflow detected ***: python terminated
Aborted (core dumped)
I generated the logs of both examples using btmon, as suggested in another thread (attached).
I can see the devices on the system GUI, and bluetoothctl also finds them.