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Limitations

  • No modem-control lines. A pty has no DTR/RTS/CTS/DSR.
    • libserialport-based hosts, including LibSerialPort.jl, fail to open the port (ENOTTY).
    • In pyserial, don't set .dtr or .rts; the underlying ioctls fail.
  • Stale bytes between sessions. The mock holds the port open while hosts come and go, so replies a host never read are delivered to the next host. Purge the input buffer after opening, and allow for a late CR from a move the previous host left running (see Host software).
  • No baud-rate or framing enforcement. A pty has neither, so any setting works, including a wrong one. The real device needs 57600 8N1.
  • POSIX only. macOS and Linux. Windows would need a virtual COM-port pair such as com0com, which is not supported.
  • Blocking I/O in the same process hangs. Use open_port to open the host side from Julia.
  • Unbounded traffic log. Every exchange is kept in memory for the mock's lifetime, which matters only for very long, high-rate runs.
  • Not modelled. Fault injection (silence, garbage, dropped CR), DIP-switch settings, the SOLO-25 and the MP-285.