Wires the SECS-I Protocol FSM behind an asio TCP socket so the block
protocol can run over loopback without serial hardware. Mirrors
secsgem-py's `secsitcp/` adapter — useful for back-to-back simulators
and CI without a serial device.
Adds:
include/secsgem/secsi/tcp_transport.hpp
src/secsi/tcp_transport.cpp
tests/test_secsi_tcp.cpp
The transport:
- Splits outgoing SECS-II messages into blocks (transparent multi-block).
- Accumulates incoming blocks until end_block=true, then assembles and
delivers as a single SECS-II message — same surface as the HSMS
Connection's MessageHandler.
- Drives T1 / T2 timers from asio steady_timer; T3/T4 stay upper-layer
per the FSM contract.
- Auto-allocates monotonic system bytes per send.
Tests cover single-block delivery, multi-block reassembly (700-byte
ASCII body spanning multiple SECS-I blocks), and bidirectional exchange.
This closes Tranche A (catch-up to secsgem-py wire/transport surface).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Adds a complete IO-free SECS-I implementation:
include/secsgem/secsi/header.hpp 10-byte block header (R/W/E bits)
include/secsgem/secsi/block.hpp length + header + body + checksum
include/secsgem/secsi/protocol.hpp half-duplex FSM (ENQ/EOT/ACK/NAK)
src/secsi/* implementations
tests/test_secsi.cpp header, block, multi-block split,
back-to-back FSM drive, RTY,
contention, T2 timeout
The protocol is event-driven (`Event` → `Action` queue), so wiring it
to an asio serial_port is a thin adapter — that lands in the next
commit so this one stays reviewable.
Key design points:
- Master/slave contention: slave yields on simultaneous ENQ (E4 §7.1.4).
- RTY exhaustion raises ActionRaiseError, clears the send queue, resets
to Idle (no zombie state).
- Multi-block assembler validates contiguous 1..N numbering and exclusive
E-bit-on-last invariants — rejects malformed sequences with nullopt.
- Block::checksum is exposed publicly for the receive path's verification.
Tests cover the happy path (back-to-back delivery), error paths
(checksum mismatch, short input, oversize body), retries (NAK chain to
exhaustion), and protocol corner cases (contention, T2 timeout).
secsgem-py implements SECS-I block framing but lacks the explicit RTY
state machine; this commit puts the C++ port ahead on transport
correctness.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
raphael