I have also buy it from Elektor, but in France.
And I have always many problems to connect it with android in my office.
The apk find the mooshimeter, but I CANT connect it.
For me, it is because wifi. I have to go outdoor to connect it, then I go back to my office. And all work fine.
BLE seems to be powerless.
And yes, I tried others wifi channels ;=)