Almost a year in the making, the highlights of the release are the migration to `core::net` IP types, IPv6 multicast, TCP improvements, and many fixes. Smoltcp now connects your gadgets to the Internet better than ever. - Minimum Supported Rust Version (MSRV) bumped to 1.80. - iface - IPv6 multicast ([#914](https://github.com/smoltcp-rs/smoltcp/pull/914), [#976](https://github.com/smoltcp-rs/smoltcp/pull/976), [#988](https://github.com/smoltcp-rs/smoltcp/pull/988), [#1009](https://github.com/smoltcp-rs/smoltcp/pull/1009), [#1012](https://github.com/smoltcp-rs/smoltcp/pull/1012)) - Add `poll_egress()` and `poll_ingress_single()` methods for finer-grained control of what and how many packets are processed. ([#954](https://github.com/smoltcp-rs/smoltcp/pull/954), [#991](https://github.com/smoltcp-rs/smoltcp/pull/991), [#993](https://github.com/smoltcp-rs/smoltcp/pull/993)) - Multicast join/leave no longer requires access to device+timestamp. ([#985](https://github.com/smoltcp-rs/smoltcp/pull/985)) - Reset expiry of entries in the neighbor cache on packet reception ([#966](https://github.com/smoltcp-rs/smoltcp/pull/966)) - Honor `any_ip` for ARP ([#880](https://github.com/smoltcp-rs/smoltcp/pull/880)) - Honor `any_ip` for IPv6 ([#900](https://github.com/smoltcp-rs/smoltcp/pull/900)) - Use own source address for ARP and NDISC Solicitations ([#984](https://github.com/smoltcp-rs/smoltcp/pull/984)) - fix panic when discarding HBH Option with multicast destination address ([#996](https://github.com/smoltcp-rs/smoltcp/pull/996)) - fix panic with 6lowpan frag datagram_size < 40 ([#997](https://github.com/smoltcp-rs/smoltcp/pull/997)) - fix panic if no suitable IPv6 src_addr is found ([#895](https://github.com/smoltcp-rs/smoltcp/pull/895)) - Fix specific length IP packets not being fragmented ([#1008](https://github.com/smoltcp-rs/smoltcp/pull/1008)) - tcp - Add support for congestion control ([#907](https://github.com/smoltcp-rs/smoltcp/pull/907)) - Add support for simultaneous open ([#1001](https://github.com/smoltcp-rs/smoltcp/pull/1001)) - Add support for Timestamp option ([#939](https://github.com/smoltcp-rs/smoltcp/pull/939)) - Send immediate ACKs after RMSS bytes of data ([#1002](https://github.com/smoltcp-rs/smoltcp/pull/1002)) - Do not ignore FIN if segment is partially outside the window. ([#977](https://github.com/smoltcp-rs/smoltcp/pull/977)) - Correctly set internal sACK flag for client sockets ([#995](https://github.com/smoltcp-rs/smoltcp/pull/995)) - Only reset remote_last_ts if some data is enqueued ([#917](https://github.com/smoltcp-rs/smoltcp/pull/917)) - Don't delay ACKs for significant window updates ([#935](https://github.com/smoltcp-rs/smoltcp/pull/935)) - Add `listen_endpoint` getter ([#1005](https://github.com/smoltcp-rs/smoltcp/pull/1005)) - socket - UDP,ICMP,raw: Add `send_queue`/`recv_queue` ([#1003](https://github.com/smoltcp-rs/smoltcp/pull/1003)) - ICMP: split ICMPv4/v6 accept and process ([#887](https://github.com/smoltcp-rs/smoltcp/pull/887)) - UDP: Store local and use local address in metadata ([#904](https://github.com/smoltcp-rs/smoltcp/pull/904)) - DNS: fix panic if server list is too long ([#986](https://github.com/smoltcp-rs/smoltcp/pull/986)) - DNS: fix panic if no valid source address is found ([#987](https://github.com/smoltcp-rs/smoltcp/pull/987)) - phy - Change mutability of `RxToken`'s `consume` argument. ([#924](https://github.com/smoltcp-rs/smoltcp/pull/924)) - Add support for NetBSD ([#883](https://github.com/smoltcp-rs/smoltcp/pull/883)) - Add minimum support for iOS ([#896](https://github.com/smoltcp-rs/smoltcp/pull/896)) - Add BPF support for FreeBSD ([#906](https://github.com/smoltcp-rs/smoltcp/pull/906)) - disable checksums on loopback ([#919](https://github.com/smoltcp-rs/smoltcp/pull/919)) - wire - Use core::net types for IP addresses. ([#937](https://github.com/smoltcp-rs/smoltcp/pull/937), [#994](https://github.com/smoltcp-rs/smoltcp/pull/994)) - Add missing exports in wire for DNS ([#891](https://github.com/smoltcp-rs/smoltcp/pull/891)) - rename Scope to MulticastScope ([#898](https://github.com/smoltcp-rs/smoltcp/pull/898)) - Re-export `dhcpv4::Flags` and `dhcpv4::OpCode` ([#901](https://github.com/smoltcp-rs/smoltcp/pull/901)) - Make Address:v6() constructor const ([#975](https://github.com/smoltcp-rs/smoltcp/pull/975)) - Ipv6RoutingHeader::clear_reserved: fix offsets for Type 2 routing headers. ([#882](https://github.com/smoltcp-rs/smoltcp/pull/882))

### Additions - wire/ipsec: add basic IPsec parsing/emitting ([#821](https://github.com/smoltcp-rs/smoltcp/pull/821)). - phy: add support for `TUNSETIFF` on MIPS, PPC and SPARC ([#839](https://github.com/smoltcp-rs/smoltcp/pull/839)). - socket/tcp: accept FIN on zero window ([#845](https://github.com/smoltcp-rs/smoltcp/pull/845)). - wire/ipv6: add `is_unique_local()` to IPv6 addresses ([#862](https://github.com/smoltcp-rs/smoltcp/pull/862)). - wire/ipv6: add `is_global_unicast()` to IPv6 addresses ([#864](https://github.com/smoltcp-rs/smoltcp/pull/864)). - iface/neigh: add `fill_with_expiration` ([#871](https://github.com/smoltcp-rs/smoltcp/pull/871)). ### Fixes - icmpv6: truncate packet to MTU ([#807](https://github.com/smoltcp-rs/smoltcp/pull/807), [#808](https://github.com/smoltcp-rs/smoltcp/pull/810)). - wire/rpl: DAO-ACK DODAG ID was wrongly read ([#824](https://github.com/smoltcp-rs/smoltcp/pull/824)). - socket/tcp: don't panic when calling `listen` again on the same local endpoint ([#841](https://github.com/smoltcp-rs/smoltcp/pull/841)). - wire/dhcpv4: don't panic when parsing addresses with incorrect amount of bytes ([#843](https://github.com/smoltcp-rs/smoltcp/pull/843)). - iface/ndisc: prevent ndisc when the medium is IP ([#865](https://github.com/smoltcp-rs/smoltcp/pull/865)). - wire/ieee802154: better parsing of security fields. Correctly parse frame type (3 bits instead of 2 bits) ([#868](https://github.com/smoltcp-rs/smoltcp/pull/864)). - wire/ieee802154: better handle address fields for new frame version ([#870](https://github.com/smoltcp-rs/smoltcp/pull/870)). - iface/tcp: don't send TCP RST with unspecified addresses ([#867](https://github.com/smoltcp-rs/smoltcp/pull/867)). - iface: don't handle empty packets (this would panic when reading the IP version) ([#866](https://github.com/smoltcp-rs/smoltcp/pull/866)). - socket/dhcp: Add an upper bound to the renew/rebind timeout in `RetryConfig` ([#835](https://github.com/smoltcp-rs/smoltcp/pull/835)). ### Changes - iface: rewrite `IpPacket` such that IPv6 packets can contain owned extension headers ([#802](https://github.com/smoltcp-rs/smoltcp/pull/802)). - iface: remove generic `T: [u8]` in functions. This reduced the server example by 10KB ([#810](https://github.com/smoltcp-rs/smoltcp/pull/810)). - SocketSet: add comment about using static lifetime for SocketSets with owned storage ([#813](https://github.com/smoltcp-rs/smoltcp/pull/813)). - phy/RawSocket: open raw socket with `O_NONBLOCK` ([#817](https://github.com/smoltcp-rs/smoltcp/pull/817)). - tests/rstest: use rstest for fixture based testing ([#823](https://github.com/smoltcp-rs/smoltcp/pull/823)). - docs/readme: update readme about IEEE802.15.4 and 6LoWPAN ([#826](https://github.com/smoltcp-rs/smoltcp/pull/826)). - wire/ipv6-hbh: IPv6 HBH has owned options instead of references ([#827](https://github.com/smoltcp-rs/smoltcp/pull/827)). - wire/sixlowpan: 6LoWPAN is split into multiple modules ([#828](https://github.com/smoltcp-rs/smoltcp/pull/828)). - sockets: match the behaviour of `peek_slice` and `recv_slice` ([#834](https://github.com/smoltcp-rs/smoltcp/pull/834)). - dependencies: update to headpless v0.8 ([#853](https://github.com/smoltcp-rs/smoltcp/pull/853)). - config: make `config` constants public ([#855](https://github.com/smoltcp-rs/smoltcp/pull/855)). - phy/ieee802154: clarify `mtu+=2` for IEEE802.15.4 ([#857](https://github.com/smoltcp-rs/smoltcp/pull/857)). - sockets: `recv_slice` returns `RcvError::Truncated` when the length of the slice is smaller than the data received by the socket ([#859](https://github.com/smoltcp-rs/smoltcp/pull/859)). - iface/ipv6: `get_source_address` uses [RFC 6724](https://www.rfc-editor.org/rfc/rfc6724) for address selection ([#864](https://github.com/smoltcp-rs/smoltcp/pull/864)). - pcap: use IEEE 802.15.4 without FCS for PCAP link types ([#874](https://github.com/smoltcp-rs/smoltcp/pull/874)). - iface: rename `IpPacket`/`Ipv4Packet`/`Ipv6Packet` to `Pacet`/`PacketV4`/`PacketV4`. This is to remove the ambiguity with `IpPacket` in `src/wire/` ([#873](https://github.com/smoltcp-rs/smoltcp/pull/873)). - wire/ndisc: rewrite parse function (3.1KiB -> 1.9KiB) ([#878](https://github.com/smoltcp-rs/smoltcp/pull/878)) - iface: Check IPv6 address after processing HBH ([#861](https://github.com/smoltcp-rs/smoltcp/pull/861))