smoltcp

v0.13.0 Growing

A TCP/IP stack designed for bare-metal, real-time systems without a heap.

0BSD Edition 2024 MSRV 1.91

Network programming Embedded development #tcp#network#udp#ip#ethernet

GitHub ↗ Docs ↗ crates.io ↗ Compare with…

Quick Verdict

✓Actively maintained (updated 7d ago)
!Pre-1.0: API may have breaking changes
✓Trusted by 563 crates
✓Team maintained (2 owners)

Security

Checking security advisories...

Downloads

5.5M

Dependents

563

Releases

Size

361KB

Deep Insights

📈

Strong growth momentum

321.4K downloads in the last 30 days (10.7K/day), up 34% from the previous period.

🔗

Moderate adoption

563 crates depend on smoltcp. Reasonable ecosystem adoption, though not yet a core dependency.

👥

Team maintained

This crate is maintained by a team (2 owners), reducing bus-factor risk and ensuring continuity.

🔬

Pre-1.0 for over a year

Despite being 9+ years old, smoltcp hasn't reached 1.0 yet. Expect potential API changes between versions.

🌟

Used by top crates

Notable dependents include virtual-net, stm32h7xx-hal, shadowsocks-service, embassy-net, esp-wifi. When high-quality crates choose smoltcp, it's a strong quality signal.

Health Breakdown

Maintenance 17/25

Recency, release consistency, active ratio

Quality 15/25

Yanked ratio, deps, size, maturity, features

Community 19/20

Reverse deps, ownership, ecosystem

Popularity 8/15

Downloads, momentum, growth trend

Documentation 15/15

Docs, repo, license, metadata

Download Trend

Daily downloads · last 90 days

9K/day avg+34%

Top Dependents

Most downloaded crates that depend on smoltcp

Version Adoption

v0.8.2

36%

v0.12.0

30%

v0.11.0

17%

v0.9.1

13%

v0.10.0

Release Timeline

22 releasessince 2016

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Feature Flags

default =["std", "log", "medium-ethernet", "medium-ip", "medium-ieee802154", "phy-raw_socket", "phy-tuntap_interface", "proto-ipv4", "proto-dhcpv4", "proto-ipv6", "proto-ipv6-slaac", "proto-dns", "proto-ipv4-fragmentation", "proto-sixlowpan-fragmentation", "socket-raw", "socket-icmp", "socket-udp", "socket-tcp", "socket-dhcpv4", "socket-dns", "socket-mdns", "packetmeta-id", "async", "multicast", "auto-icmp-echo-reply"]

std*allocasync*defmtsocket_netsimverbosemedium-ip*multicast*proto-dns*proto-rplproto-ipv4*proto-ipv6*socket-dns*socket-raw*socket-tcp*socket-udp*proto-ipsecsocket-icmp*socket-mdns*proto-dhcpv4*packetmeta-id*socket-dhcpv4*phy-raw_socket*proto-ipsec-ahproto-ipv6-hbhmedium-ethernet*proto-ipsec-espproto-sixlowpansocket-tcp-renoproto-ipv6-slaac*socket-tcp-cubicmedium-ieee802154*proto-ipv6-routing_proto-fragmentationauto-icmp-echo-reply*dns-max-name-size-64phy-tuntap_interface*dns-max-name-size-128dns-max-name-size-255dns-max-result-count-1dns-max-result-count-2dns-max-result-count-3dns-max-result-count-4dns-max-result-count-8dns-max-server-count-1dns-max-server-count-2dns-max-server-count-3dns-max-server-count-4dns-max-server-count-8iface-max-addr-count-1iface-max-addr-count-2iface-max-addr-count-3iface-max-addr-count-4iface-max-addr-count-5iface-max-addr-count-6iface-max-addr-count-7iface-max-addr-count-8ipv6-hbh-max-options-1ipv6-hbh-max-options-2ipv6-hbh-max-options-3ipv6-hbh-max-options-4ipv6-hbh-max-options-8dns-max-result-count-16dns-max-result-count-32dns-max-server-count-16dns-max-server-count-32iface-max-route-count-0iface-max-route-count-1iface-max-route-count-2iface-max-route-count-3iface-max-route-count-4iface-max-route-count-5iface-max-route-count-6iface-max-route-count-7iface-max-route-count-8ipv6-hbh-max-options-16ipv6-hbh-max-options-32socket-tcp-pause-synackiface-max-prefix-count-1iface-max-prefix-count-2iface-max-prefix-count-3iface-max-prefix-count-4iface-max-prefix-count-5iface-max-prefix-count-6iface-max-prefix-count-7iface-max-prefix-count-8iface-max-route-count-16iface-max-route-count-32iface-max-route-count-64proto-ipv4-fragmentation*proto-ipv6-fragmentationiface-max-route-count-128iface-max-route-count-256iface-max-route-count-512reassembly-buffer-count-1reassembly-buffer-count-2reassembly-buffer-count-3reassembly-buffer-count-4reassembly-buffer-count-8iface-max-route-count-1024reassembly-buffer-count-16reassembly-buffer-count-32reassembly-buffer-size-256reassembly-buffer-size-512rpl-parents-buffer-count-2rpl-parents-buffer-count-4rpl-parents-buffer-count-8reassembly-buffer-size-1024reassembly-buffer-size-1500reassembly-buffer-size-2048reassembly-buffer-size-4096reassembly-buffer-size-8192rpl-parents-buffer-count-16rpl-parents-buffer-count-32iface-neighbor-cache-count-1iface-neighbor-cache-count-2iface-neighbor-cache-count-3iface-neighbor-cache-count-4iface-neighbor-cache-count-5iface-neighbor-cache-count-6iface-neighbor-cache-count-7iface-neighbor-cache-count-8reassembly-buffer-size-16384reassembly-buffer-size-32768reassembly-buffer-size-65536rpl-relations-buffer-count-1rpl-relations-buffer-count-2rpl-relations-buffer-count-4rpl-relations-buffer-count-8assembler-max-segment-count-1assembler-max-segment-count-2assembler-max-segment-count-3assembler-max-segment-count-4assembler-max-segment-count-8fragmentation-buffer-size-256fragmentation-buffer-size-512iface-neighbor-cache-count-16iface-neighbor-cache-count-32iface-neighbor-cache-count-64proto-sixlowpan-fragmentation*rpl-relations-buffer-count-16rpl-relations-buffer-count-32rpl-relations-buffer-count-64assembler-max-segment-count-16assembler-max-segment-count-32fragmentation-buffer-size-1024fragmentation-buffer-size-1500fragmentation-buffer-size-2048fragmentation-buffer-size-4096fragmentation-buffer-size-8192iface-neighbor-cache-count-128iface-neighbor-cache-count-256iface-neighbor-cache-count-512rpl-relations-buffer-count-128fragmentation-buffer-size-16384fragmentation-buffer-size-32768fragmentation-buffer-size-65536iface-neighbor-cache-count-1024iface-max-multicast-group-count-1iface-max-multicast-group-count-2iface-max-multicast-group-count-3iface-max-multicast-group-count-4iface-max-multicast-group-count-5iface-max-multicast-group-count-6iface-max-multicast-group-count-7iface-max-multicast-group-count-8iface-max-multicast-group-count-16iface-max-multicast-group-count-32iface-max-multicast-group-count-64iface-max-multicast-group-count-128iface-max-multicast-group-count-256iface-max-multicast-group-count-512iface-max-multicast-group-count-1024iface-max-sixlowpan-address-context-count-1iface-max-sixlowpan-address-context-count-2iface-max-sixlowpan-address-context-count-3iface-max-sixlowpan-address-context-count-4iface-max-sixlowpan-address-context-count-5iface-max-sixlowpan-address-context-count-6iface-max-sixlowpan-address-context-count-7iface-max-sixlowpan-address-context-count-8iface-max-sixlowpan-address-context-count-16iface-max-sixlowpan-address-context-count-32iface-max-sixlowpan-address-context-count-64iface-max-sixlowpan-address-context-count-128iface-max-sixlowpan-address-context-count-256iface-max-sixlowpan-address-context-count-512iface-max-sixlowpan-address-context-count-1024