How to get traffic information from Ethernet port of AP via SNMP. And How to get RSSI levels of connected clients via SNMP.

[#1]

Hi all,
My client actively uses SNMP to monitor and collect needed information from standalone APs.
He wants to get sent and received traffic information from Ethernet port on AP via SNMP.
Second question how to get RSSI levels of connected client (dedicated for 2.4 and 5Ghc clients) via SNMP?
Which OIDs should be used for it?

Regards,
Dmitry