The rod ignition transformer including an integrated low-voltage connector to the on-board network supply, and an integrated high-voltage connector to the spark plug, both accommodated in a housing. Each photovoltaic cell may include a plurality of lamellar electrically conductive surface regions. The carrier structure keeps the oxygen tubing from getting tangle or kinked. An elastic member can provide an elastic force against the driving rod. The reply to the first message includes the third debug information and second debug information associated with the second service host.