Autocharge MAC EVSE ID extraction (plcstat)

[tropxy]

AB#1525 AB#1526

For Autocharge it is possible to extract the PLC unique MAC Address from the EV, which is useful for Autocharge use case

Menno's answer:

Hi @André Duarte as mentioned during the meeting, below is the info I added to our ticket to retrieve the EV PLC node MAC address. I will also add a Wireshark trace.
Quote from ticket:
Even though the EV PLC node MAC address is not present in the high-level communication, there is a method to retrieve it. This is only possible though after SLAC matching has succeeded, because it uses specific messages defined in the HomePlug standard to retrieve the network configuration.
In open-plc-utils (the QCA reference implementation) there are two commands:

$ plcstat -t -i vensb1
 P/L NET TEI ------ MAC ------ ------ BDA ------  TX  RX CHIPSET FIRMWARE
 LOC CCO 001 00:01:87:10:A1:C0 DE:8F:A8:F8:30:76 n/a n/a QCA7000 MAC-QCA7000-1.2.5.3207-00-20180927-CS
 REM STA 002 02:26:00:00:00:22 FF:FF:FF:FF:FF:FF 009 009 QCA7000 MAC-QCA7005-1.2.5.3207-00-20180927-CS
and
plctool -m -i vensb1
vensb1 00:B0:52:00:00:01 Fetch Network Information
vensb1 00:01:87:10:A1:C0 Found 1 Network(s)
source address = 00:01:87:10:A1:C0
network->NID = 76:DE:7D:2E:84:D4:00
network->SNID = 13
network->TEI = 1
network->ROLE = 0x02 (CCO)
network->CCO_DA = 00:01:87:10:A1:C0
network->CCO_TEI = 1
network->STATIONS = 1
	station->MAC = 02:26:00:00:00:22
	station->TEI = 2
	station->BDA = FF:FF:FF:FF:FF:FF
	station->AvgPHYDR_TX = 009 mbps Primary
	station->AvgPHYDR_RX = 009 mbps Primary

which both reveal that 02:26:00:00:00:22 is the EV PLC node MAC address.
The underlying HomePlug message that can be used to retrieve the logical network information is NW_INFO.REQ. If the EVSECC sends that request to the generic HomePlug destination MAC 00:b0:52:00:00:01, the EVSE PLC node will return the network information with connected stations, including the MAC address.
Clearly, this only works after the logical network is formed, so SLAC must complete first.

Verisco_network_info.pcapng.txt