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…