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TCP (Transmission Control Protocol) as described in Section 3.3.2 TCP Protocol,
HTTP (Hypertext Transfert Protocol) as described in Section 3.3.3 HTTP Protocol,
HTTPS (or HTTP over SSL/TLS) as described in Section 3.3.4 HTTPS Protocol,
Sale to POI Protocol over TLS as described in Section 3.3.5 Sale to POI Protocol over TLS.
TCP Protocol
Message Delimitation
The TCP protocol is a stream protocol which does not offer message delimitation or data-unit
delimiting. It uses the general mechanism of message delimitation provided for all the transport
protocols.
Message delimitation or data-unit delimiting is the service provided by the transport protocol allowing
the recognition of an application data-unit by the transport protocol, in order to transfer a complete
application message to the Application Protocol.
Application messages are preceded by four bytes containing the length in network order, of the
application message. The length does not include the four bytes containing the length.
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Services
ARKOS Vanilla version supports the following services in Nexo Retailer. Additional services are also supported depending on the customers project requiements and device capabilities.
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Open a Session (Login Request) : Begins the association between two components of the Sale System and the POI System.
Close a Session (Logout Response) : Ends the association between two components of the Sale System and the POI System.
Financial services
Initiate a Standard Purchase (Normal Payment) : Realizes the normal purchase payment of goods or services by the customer with a payment card.
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