Transfers data between the tag and the gateway?

Hi, i have three questions at present and need your help!
1 What is the way to transfer data between the tag and the gateway?
2 Will the mobile interface be updated in real time after modifying the node information in WEB ? If it is updated, the data has been sent back to the node device, right? By what ways?
3 Raspberry Pi and development board composed of gateway, can change the power of it?

Looking forward to your reply! Thanks!