Can host our own cloud service instead of using the devicecloud.digi.com ? ?

Digi Remote Manager
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2

I don’t know what product it is you are working with, but some of the Digi device can use other cloud services.

3

I want to setup my own site to grab the data, is there documentation to do that somewhere ?

4

https://hub.digi.com/support/products/digi-remote-manager/