BikeLock.where("reported_at is not null").order(reported_at: :desc).each do |l|
  file << l.status << "," << l.lock_state << "," << l.plate_number << ","
  file << l.imei << "," << l.iccid << "," << l.sim_sid << ","
  file << l.reported_at << ","  << l.lock_state_updated_at
  file << "\n"
end
file.close