Hi Ingo,
the only fields you have to fill in when adding a new sensor are the ones for the so-called device keys, i.e. DevEUI + JoinEUI + AppKey. You simply leave Rx-Relay as pre-filled and all other information is optional.
Where you get this information or keys depends on where you purchase or have purchased the devices and partly also from the manufacturer. For devices ordered in the ZENNERShop, you usually receive the keys via the ZENNER delivery note portal. The electronic delivery bills for your order(s), including keys, are stored there and are available for download. You simply set up access to the portal once with the initial registration data printed on the paper delivery bill. You can find more information about this and PDF instructions at https://iot.zenner.shop/en/info-about-iot-device-keys. However, there is one exception: If you order your sensors with the additional option ZENNER IoT PLUG&PLAY, the keys will not be transferred to the delivery note portal, because in this case the devices are automatically added for you in the B.One Middleware as well as in the visualization tool B.One Gallery. As far as the DevEUI is concerned, you can sometimes find it directly on the respective device or its outer packaging, but it is actually not the rule.
Hope this answers your question 🙂
Best regards,
Michael