A method, a vehicle mountable controller and a device for operating a vehicle mountable controller in a computer network

The invention concerns a method for operating a vehicle mountable controller (120), in particular a controller mounted to a vehicle and when in use controlling at least a part of the vehicle's operation, as computer network element in a computer network, wherein idle controller resource of the vehicle mountable controller (120) is provided for remote processing to the computer network by - determining the operating mode of the vehicle the vehicle mountable controller (120) is mounted to, and - performing a test for determining whether to use the vehicle mountable controller (120) as network element or not depending on the operating mode of the vehicle, in particular at the time the test is performed.