Work on GetConfiguration.

devices/geiger/gqgmc.go

@@ -451,7 +451,7 @@ func (gc *GQGMCCounter) readCmd(length uint32) ([]byte, error) {
 		return nil, err
 	}
 	if uint32(n) != length {
-		return nil, errors.New("Short read")
+		return nil, fmt.Errorf("Short read (got: %d, wanted: %d)", uint32(n), length)
 	}
 	return buf, nil
 }