1.7.0-RC3

• ⭐ Add unstable, non-spawning master and outstation task APIs behind the semver-exempt unstable feature, allowing applications to obtain runnable tasks/futures without the library calling tokio::spawn internally. See #433.
• ⭐ Add EndpointList::into_connect_handler() and EndpointList::into_connect_handler_with_options() to build a ClientConnectionHandler from an endpoint list, e.g. for use with spawn_master_tcp_client_3. See #433.
• 🔧 The no-spawn TCP outstation server APIs (Server::add_outstation_no_spawn and Server::bind_no_spawn) no longer attach a tracing span to the futures they return. This is intentional so that non-spawning callers retain full control over instrumentation. Rust callers that relied on the previous automatic dnp3-outstation-tcp / tcp-server spans should now wrap the returned future in their own span before spawning it. The prebuilt bindings (C/C++, .NET, Java) are unaffected. See #433.

1.7.0-RC2

• ⭐ Add Database::discard_unselected_events() to drop undelivered events of selected classes on demand, e.g. from a disconnect handler. Returns per-class discard counts. Opt-in and lossy by design. See #427.
• 🛡️ Update rustls-webpki to 0.103.13 to resolve RUSTSEC-2026-0098 and RUSTSEC-2026-0099, both concerning incorrect acceptance of X.509 name constraints. Exposure is limited to TLS configurations using CertificateMode::AuthorityBased; SelfSigned mode bypasses the affected code path.
• 🔔 This update only affects the prebuilt binary distributions of the bindings (C/C++, .NET, Java). Rust consumers of the dnp3 crate pick up the patched rustls-webpki automatically on rebuild.

1.7.0-RC1

• ⭐ Add outstation ConnectionManager with fine-grained connection control for TCP and TLS clients. See #381, #406.
  • New Rust API: spawn_outstation_tcp_client_2() and spawn_outstation_tls_client_2() functions with ClientConnectionHandler trait
  • New FFI API: outstation_create_tcp_client_with_handler() and outstation_create_tls_client_with_handler() functions
  • Provides dynamic endpoint selection, custom retry logic, connection lifecycle notifications, and DNS resolution handling
  • Per-connection master address override via ConnectionInfo::set_master_address() for failover scenarios
• ⭐ Add DirectWriteAbsTime time sync procedure for non-conformant outstations. See #403.
  • Writes Group 50 Var 1 directly without delay measurement for outstations that don't properly implement IEEE-1815 time sync
• ⭐ Add optional support for parsing and transmission of zero-length octet strings via global setting. See #379.
• ⭐ Add optional support for AWS libcrypto (aws-lc-rs) as TLS backend. See #378.
• ⭐ Make OctetString constructor public in Java bindings. See #402.
• ⭐ Make HeaderInfo constructor public for mockability in tests. See #404.
• 🛡️ Add security policy and automated supply chain scanning. See #394.
• 🔧 Add quality gate to prevent releases when tests fail. See #393.
• 🔧 Automate cargo publish to crates.io in CI release process. See #407.
• 🔧 Better CLI examples with improved organization and documentation. See #375.
• 🔧 Refactor release workflow into separate idempotent jobs for improved reliability.
• 📖 Update TLS documentation to clarify empty string behavior for certificate passwords and improve grammar. See #389.

1.6.0

• ⭐ Add master station support for writing files to the outstation. See #338.
• ⭐ Add master station support for command events (groups 13 and 43). See #332.
• ⭐ Add master station support for group 102. See #335.
• ⭐ Add master and outstation support for UDP. See #353.
• ⭐ Add master station support for acting as a TCP server. See #358.
• ⭐ Add ability to update flags and timestamp without knowing the current value. See #365.
• ⭐ Obtain TCP port from server in Rust API. #331.

1.5.2

• 🐛 Fix bug where the outstation would sleep before all unsolicited data was transmitted. See #341.

1.6.0-M1

• ⭐ Add master station support for writing files to the outstation. See #338.
• ⭐ Add master station support for command events (groups 13 and 43). See #332.
• ⭐ Add master station support for group 102. See #335.
• ⭐ See TCP port from server in Rust API. #335.

1.5.1

• 🔧 Update to oo-bindgen 0.8.6 to improve Java native library loading. See oo-bindgen #124.
• 🔔 This release only affects the Java distribution. It is equivalent to 1.5.0 for other distributions.

1.5.1-rc2

• 🔧 Update to oo-bindgen 0.8.5 to improve Java native library loading. See oo-bindgen #124.

1.5.0

• ⭐ Add configuration option that allows outstation to respond to any master. See #316.
• ⭐ Add optional serde support for public config types in Rust. See #303.
• 🔧 Fix cmake download when building C/C++ examples. See #307.
• 📖 Fix FFI docs for g12v1 and remove g12v0 and g41v0. See #308
• 🐛 Fix master task scheduling CPU thrashing under certain conditions. See #312.
• 🐛 Fix bug where AssociationInformation::task_fail was not properly being called for some tasks. See #313.
• 🐛 Update rx509 to 0.2.1 to fix ASN.1 GeneralizedTime parsing. See RASN #2.

1.5.0-rc1

• ⭐ Add configuration option that allows outstation to respond to any master. See #316.
• ⭐ Add optional serde support for public config types in Rust. See #303.
• 🔧 Fix cmake download when building C/C++ examples. See #307.
• 📖 Fix FFI docs for g12v1 and remove g12v0 and g41v0. See #308
• 🐛 Fix master task scheduling CPU thrashing under certain conditions. See #312.
• 🐛 Fix bug where AssociationInformation::task_fail was not properly being called for some tasks. See #313.