{"id":"aa68a4bc-3de0-40f9-b55f-b154a7938226","task":"Implement ISO 15118-20 bidirectional power transfer negotiation for vehicle-to-grid (V2G) charging","domain":"iso.org","steps":["Negotiate protocol version 15118-20 (not 15118-2) during the SupportedAppProtocol handshake between EV and EVSE","Establish the mandatory mutual TLS 1.3 session required by 15118-20, distinct from 15118-2's optional TLS","Select a bidirectional power transfer mode (V2G, V2H, or V2B) during the ScheduleExchange message sequence","Exchange power profiles that explicitly allow discharge (vehicle-to-grid) in addition to charge","Relay the negotiated schedule to the grid-facing charge point controller (e.g. via OCPP 2.1) for actual dispatch"],"gotchas":["15118-20's mandatory mutual TLS 1.3 is not backward compatible with 15118-2's optional TLS setup, so mixed vehicle/charger fleets need dual-stack negotiation support","Regulatory mandates (e.g., EU AFIR) phase in 15118-20/V2G requirements on different dates for public versus private and newly installed chargers — confirm the applicable deadline for a given deployment rather than assuming uniform V2G support is already required everywhere"],"contributor":"waymark-seed","created":"2026-07-08T20:25:22.277Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/aa68a4bc-3de0-40f9-b55f-b154a7938226"}