feat: Support for 15118-20 (#33)

* feat: Support for 15118-20

* feat: Addressed comments. Fixed issue with wrong charge loop params being returned (AB#1770)

* 15118-20 service detail parameters are moved to a separate json file.

* Fixed black error in shared/settings.py

* feat: Updated simulator.py (AB#1770)

Condition that returned None for ScheduledExchangeRes Dynamic_SEResControlMode/Scheduled_SEResControlMode has been removed.

* feat: Addressed comments on PR (AB#1770)

* feat: changes to unpacking.(AB#1770)

* Updated secc/simulator.py

iso15118/evcc/comm_session_handler.py

@@ -38,7 +38,17 @@
     Namespace,
     Protocol,
 )
-from iso15118.shared.messages.iso15118_2.datatypes import ChargingSession
+from iso15118.shared.messages.iso15118_2.datatypes import (
+    ChargingSession as ChargingSessionV2,
+)
+from iso15118.shared.messages.iso15118_20.common_messages import (
+    ChargingSession as ChargingSessionV20,
+)
+from iso15118.shared.messages.iso15118_20.common_messages import (
+    ScheduleExchangeReq,
+    ScheduleExchangeRes,
+)
+from iso15118.shared.messages.iso15118_20.common_types import Processing
 from iso15118.shared.messages.sdp import SDPRequest, SDPResponse, Security, Transport
 from iso15118.shared.messages.timeouts import Timeouts
 from iso15118.shared.messages.v2gtp import V2GTPMessage
@@ -99,10 +109,24 @@ def __init__(
         # Once the timer is up, the EV will terminate the communication session.
         # A value >= 0 means the timer is running, a value < 0 means it stopped.
         self.ongoing_timer: float = -1
+        # Temporarily save the ScheduleExchangeReq, which need to be resent to the SECC
+        # if the response message's EVSEProcessing field is set to "Ongoing"
+        self.ongoing_schedule_exchange_req: Optional[ScheduleExchangeReq] = None
+        # Whether the EV is still processing to calculate the EVPowerProfile.
+        # That value is needed across states (ScheduleExchange and PowerDelivery)
+        # (ISO 15118-20)
+        self.ev_processing: Processing = Processing.FINISHED
+        # Temporarily save the ScheduleExchangeRes, in case the EVProcessing field of
+        # PowerDeliveryReq is set to "Ongoing", so we can access that response in the
+        # following PowerDelivery state (ISO 15118-20)
+        self.schedule_exchange_res: Optional[ScheduleExchangeRes] = None
         # Whether to pause or terminate a charging session. Is set when sending
-        # a PowerDeliveryReq
-        self.charging_session_stop: Optional[ChargingSession] = None
-        # Whether or not a renegotiation was requested by the SECC (with either
+        # a PowerDeliveryReq (ISO 15118-2)
+        self.charging_session_stop_v2: Optional[ChargingSessionV2] = None
+        # Whether to pause, standby or terminate a charging session. Is set when sending
+        # a PowerDeliveryReq (ISO 15118-20)
+        self.charging_session_stop_v20: Optional[ChargingSessionV20] = None
+        # Whether a renegotiation was requested by the SECC (with either
         # a MeteringReceiptRes, ChargingStatusRes, or CurrentDemandRes) or EVCC
         self.renegotiation_requested = False
         # The ID of the EVSE that controls the power flow to the EV