message: dronelink_impl: don't accept a UUID of 0
diff: @@ -72,7 +72,10 @@ const std::vector<uint64_t> &DroneLinkImpl::get_device_uuids() const
  static std::vector<uint64_t> uuids;
  for (auto it = _devices.begin(); it != _devices.end(); ++it) {
  - uuids.push_back(it->second->info().get_uuid());
  + uint64_t uuid = it->second->info().get_uuid();
  + if (uuid != 0) {
  + uuids.push_back(uuid);
  + }
  }
  return uuids;
  