Just received my WARP4, and tried the ISO15188 using a Mercedes GLC400e 2023, German version, bought in Germany

When the car is already plugged in and i switch the iSO option "get soc from vehicle" the car goes briefly in to alarm and recovers.
When the car is later disconnected and reconnected the alarm is persistent, but not blocking the charge. The alarm does not clear until I unplugged the cable.

I used the "Faster fallback to normal charging for vehicles without ISO 15118" but that does not seem to do anything.
I have not rebooted the WARP after setting that option.

Debug log attached. The 34% SOC is incorrect, the car is at 98% now. That 34% may well be from the first action where it recovered.



Thanks in advance,

Johan

warp4-e88s-EVSE-charge-protocol-2026-10-26T09-41-36-171.txt

In the log it looks like you turned the ISO 15118 off while the EV was connected, it then tried to talk to us, then you turned it on while in the middle of talking to us.

We are not handling this well in the firmware, i think i can see why it read the SoC but did not increase it with the charging. I will improve this in the firmware for future versions, so there is no "race condition" any more.

Just to be completely sure that there is nothing stuck, please Reboot the box once when no EV is connected (System -> Settings -> Reboot).

Does the SoC still get stuck then next time you connect the EV?

I guess the log took some of my previous trials.

This is set iso15188 - read soc. Save. No other settings active.
Rebooted, started log, plugged car in.

warp4-e88s-EVSE-charge-protocol-2026-10-26T11-06-00-512.txt