The original post mentions wirelessOutEthernetOctets. This was one of a group of SNMP coubnter objects introduced in 650-01-46. We talked about that in Trying to monitor wireless throughput of PTP 650
We don't have an equivalent set of counters for PTP 600, and we are not maintaining PTP 600 firmware, so we're not likley to be adding them.
You could probably achieve part of what you are asking for by accessing the counters for the Ethernet port. These are in the standard SNMP MIBs (not the PTP 600 enterprise MIB). For example, ifHCOutOctets (.1.3.6.1.2.1.31.1.1.1.10) is a COUNTER64 object reporting the number of octets transmitted at the PTP 600 Ethernet interface. This will normally be approximately the same as the octets transferred over the wireless link.