under debian Buster i got the messages
./app1
heartbeat thread: Writer: PCB_VERSION: no such command
reader thread: BLE: read: Connection reset by peer
and nothing will happend. I change the address of the meter and the streams.

does any one have an idea?

Does your mooshimeter have a firmware version starting with 152?
If so, the original lib won’t work, because the CRC32 checksum verification during connection is broken.

You can try my patched version instead:
https://github.com/sigurg/VoltFish/tree/master/src/lib

I didn’t bother to maintain the lib as git submodule, but copying the files from my repo should work (you might need to add the “-lz” linker flags, since I added a dependency to zlib for their crc32() calculation).

If you are interested in helping to maintain the lib, contact me (an issue on github would be ideal) and I will split the lib to a separate repo…

Marc, Are you using the built-in Bluetooth on a Pi3 or Pi4? I get similar errors, unless I use a USB BT dongle. I don’t know nearly enough about Bluetooth to say why this might be, but it might be worth trying to reach the author of the C library.

I try it under debian buster with Bluetooth Dongle

0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)

Do you have an idea?
I want to read the mooshimeter by desktop or labtop with python to write the values in a file.

Thanks

Marc