Is there a way to have an event of a device connected to one homebase2 trigger an alarm on another homebase2 (or other device)?
Because of wireless range limitations I have a seperate homebase2 for my house and my garage but I want an event in the garage to trigger an alarm in my house.
No. Unfortunately Eufy has designed the homebase so it only talks to child devices but not other homebases. They didn’t think about people with larger locations that need multiple homebases. Homebase should have a channel to communicate to other homebase devices so that all devices could be managed in one place and do things like you are trying to do. They have been promising a homebase 3 with those capabilities and external storage since Oct 2020, but, like other Eufy promised capabilities, its always next year.