Hi All,
There was a request for more information in the IdTagInfo class to be able to give more feedback to the EV Driver about the reason why the authorization has failed.
Use Case: An EV Driver swipes his card, the Charge Point asks the Central System if the card is allowed to charge. Computer says NO....
If a Charge Point has a display you want to show a reason to the EV driver why he/she is not allowed to Charge.
In OCPP 1.6 there are already a couple of different statuses, but these are limited. See:
- 7.27. IdTagInfo on page 98
- 7.2. AuthorizationStatus on page 85
Currently we have the following statuses:
Accepted Identifier is allowed for charging.
Blocked Identifier has been blocked. Not allowed for charging.
Expired Identifier has expired. Not allowed for charging.
Invalid Identifier is unknown. Not allowed for charging.
ConcurrentTx Identifier is already involved in another transaction and multiple transactions are not allowed. (Only relevant for a StartTransaction.req.)
I see 2 possible solutions:
- 1: Add more statuses to AuthorizationStatus
- Pros: simple, only extend the enumeration, Charge Point can implement messages that fit the display.
- Cons: how do we know we have all the possible reasons (Not enough pre-paid amount, Fast Charging not allowed?)
- 2: Add a extra optional string field: StopReason to IdTagInfo.
- Pros: everything possible reason can be given.
- Cons: Central System needs to know display size of the Charge Point. How about non ascii-character sets, use UTF-8?. Central System might need to know the language if the user is unknown, and has select a language on the Charge Point.
I tend to lean to option 1... All this UTF-8 and display size stuff makes a more complex solution.... But on the other hand, we might need to go into that for messages anyway....
Do you guys see a good reason why we should or should not go for one of these options?
Kind regards,
Robert de Leeuw
IHomer
Hoge Ham 85
5104 JC Dongen
John F. Kennedylaan 3
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robert.de.leeuw@ihomer.nl