Hi Manh,
1 - Can you confirm if the following information is right? You will have 2 computers connected in the same local network, being the server computer and client computer. Then, a Device connects to an external network as shown in the image below?
If it is right you can use the configuration in edit > Devices > Channels > RemoteSettings column (image 2).
2 - We have forwarded this question to our development team, as soons as they reply, we’ll let you know.