Device-to-Device Service¶
The simplest service is a connection between two devices. There is no network layer, so the connection is only used for APDUs. The NPCI provides priority, but other fields such as the DNET/DLEN/DADR and SNET/SLEN/SADR are absent.
After authentication, if the server does not provide the Device-to-Device Service then it will send a Service Request Result with the error code NO_DEVICE_TO_DEVICE_SERVICE.
Protocol Data Units¶
There is only one kind of packet between the client and server, and once the session is established, the two end points are peers.