It is now possible to transmit CAN bus data wireless and reliably from one or two CAN Bus knots bidirectional via WLAN. There is no loss of data, even if the transfer capacity is reached. In case of disturbance or failure of the wireless connection, the data will be buffered and the sending progress will be repeated until there is a success. The WLAN transmission can be made an access point or also directly to another WLAN client as for example to a notebook or another CANbox.