Germany does not deliver arms to Iran, but to Israel.
What´s your point?
Germany is, the or one of Iran's major trading partners, especially it's world renown machine tools, presses, and other specialized cutting and milling machines. These are used for Iran's weapons production.
So, we may see German built Israeli Navy subs, firing nuclear weapon cruise missiles, at Iranian weapon/missile manufacturing sites with German CNC and other specialized tools. Not that that kind of oddness doesn't occur whith the US, with say, it now supplying advanced F-16 to Pak, which can not get a truck full of troops up a mountain road but is spending billions on nuclear weapons against India. Hardly anything makes sense to me anymore.