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According to spec, GenChallenge is only sent on the first AuthorizationReq message by EV.
[V2G2-684] After receiving the AuthorizationRes, the EVCC shall send an empty AuthorizationReq while V2G_EVCC_Sequence_Timer is smaller than V2G_EVCC_Sequence_Performance_Time as long as the parameter EVSEProcessing is equal to 'Ongoing'.
NOTE 2 The EV only sends a AuthorizationReq message containing a Signature, Id and GenChallenge included as the first AuthorizationReq message. Consecutive messages that are only required when a AuthorizationRes message was received with EVSEProcessing set to Ongoing are sent without this information.