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TRS tunnels raw smart-card APDUs from the CP, through a PD acting as a transparent pipe, to a card in the reader (OSDP CMD_XWR/REPLY_XRD, capability SMART_CARD_SUPPORT). The control panel drives the card directly, so a compromised reader cannot forge a credential. The CP runs the session as a library-driven state machine: it negotiates transparent mode, streams the app's APDUs, and tears the session down on osdp_cp_trs_stop(). Apps submit OSDP_CMD_XWR commands and receive card responses as OSDP_EVENT_TRS events. The PD answers each APDU either synchronously, in the command callback, or deferred: it ACKs "working" and delivers the response on a later poll once a slow card responds. Deferral keeps a shared multi-drop bus non-blocking, so each PD's session makes progress independently. Gated behind OPT_BUILD_OSDP_TRS (default off); wired into both build systems and covered by a CP<->PD APDU round-trip unit test. Co-developed-by: Aaron Tulino (Aaronjamt) <git@aaronjamt.com> Signed-off-by: Siddharth Chandrasekaran <sidcha.dev@gmail.com>
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TRS tunnels raw smart-card APDUs from the CP, through a PD acting as a transparent pipe, to a card in the reader (OSDP CMD_XWR/REPLY_XRD, capability SMART_CARD_SUPPORT). The control panel drives the card directly, so a compromised reader cannot forge a credential.
The CP runs the session as a library-driven state machine: it negotiates transparent mode, streams the app's APDUs, and tears the session down on osdp_cp_trs_stop(). Apps submit OSDP_CMD_XWR commands and receive card responses as OSDP_EVENT_TRS events.
The PD answers each APDU either synchronously, in the command callback, or deferred: it ACKs "working" and delivers the response on a later poll once a slow card responds. Deferral keeps a shared multi-drop bus non-blocking, so each PD's session makes progress independently.
Gated behind OPT_BUILD_OSDP_TRS (default off); wired into both build systems and covered by a CP<->PD APDU round-trip unit test.
Co-developed-by: Aaron Tulino (Aaronjamt) git@aaronjamt.com