Fixed the EVSE CM_SLAC_PARAM.CNF response to match the ISO 15118-3 standard

[pedrorivera]

I wasn't able to use the demo SLAC procedure implemented in evse.c with a real ECU. It turns out at least this big name EVCC implementation requires the CM_SLAC_PARAM.CNF MME to exactly comply with the table A.2 provided in ISO 15118-3. This involves:

• Setting FORWARDING_STA to the EV HLE address
• Setting RESP_TYPE, NUM_SOUNDS, and TIME_OUT to the values indicated in the std. (1, 10, 6 resp.)

[mhei]

When you change EVSE side here, isn't a chance to PEV side necessary then, too?

[pedrorivera]

@mhei there is no adaptation necessary on the PEV side, since the code in pev_cm_slac_param.c:150 already takes the FORWARDING_STA from the EVSE confirmation and copies it to the session variable:

memcpy (session->FORWARDING_STA, confirm->FORWARDING_STA, sizeof (session->FORWARDING_STA));

An assertion would be nice, but being a demo, I don't think that level of error handling is justified. Oder?

[aduskett]

I just wanted to chime in and also say this fixed my issues with SLAC negotiation. I'm perplexed as to why Qualcomm hasn't merged this simple fix in yet.

[n1000]

Thanks for the update on this issue... I don't currently have any way to fully test this (this is the main reason this hasn't been merged yet). Based on feedback from multiple parties showing this fix is good, I will merge this now.