Hi NinoK,
if you create a new BACnet-Data-Source your local device IP (old system settings / BACnet local devices: 192.168.100.105:47808) should be the same as the Mango-Server has:
eaa0e014-a86a-49a7-8c70-adb68e0b9681-image.png
398beb33-f0cb-492e-a4da-dd3c65ba357c-image.png
a4ecbe7b-23bb-4618-97bd-e72bbae9b20b-image.png
If you create a new BACnet data point it should look like:
2c6aded6-316c-465b-b134-ca48a1f72d66-image.png
where the "Device instance number" is the given Device ID, here 5.
If all BACnet-Devices are in the same IP-Range you don't need a BBMD.
Be carful if you scan a large BACnet-Network with many devices and objects. It can take a long time and need server-resources. Better is to scan one ID.