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Jonathan Hui e1b34bc5bc [simulation] increase socket receive buffer size to 2MB (#13173 )

This commit sets the SO_RCVBUF socket option to 2MB on the
multicast receiving sockets in the simulation platform.

Under heavy simulation load (such as expect tests with 15 nodes
all sending MLE advertisements and discovery packets), the default
OS UDP receive socket buffer can overflow, leading to silent
packet drops. This occasionally caused expect tests like
cli-big-table.exp to fail with "Join failed [NotFound]" because
Node 4's discovery requests or response beacons were dropped.

Increasing the receive buffer size to 2MB prevents packet loss
during dense simulation runs, resolving intermittent CI test
failures.

2026-05-28 16:52:16 -07:00

virtual_time

[simulation] set virtual UART at runtime (#12199 )

2025-12-09 08:48:37 -08:00

alarm.c

[simulation] log the exit code when the program exits (#10936 )

2024-11-20 07:22:47 -08:00

ble.c

[tcat] add tcat implementations and bug fixes (#11402 )

2025-07-30 12:27:10 -07:00

CMakeLists.txt

[ncp] add empty implementation for dnssd platform APIs (#10877 )

2024-10-30 13:10:30 -07:00

crypto.c

[core] add missing platform function for OT_PLATFORM_KEY_REF (#9620 )

2023-11-19 18:49:30 -08:00

diag.c

[doxygen] remove empty line at end of block (#10748 )

2024-09-24 09:51:34 -07:00

dns.c

[dns] signal an error immediately when no upstream DNS server available (#11480 )

2025-05-20 14:50:18 -07:00

dnssd.c

[dnssd] support generic record queries via discovery proxy and SRP (#11357 )

2025-04-23 12:14:05 -07:00

dso_transport.c

[net] add support for DNS Stateful Operations (DSO) (#7081 )

2022-01-14 16:25:16 -08:00

entropy.c

[doxygen] remove empty line at end of block (#10748 )

2024-09-24 09:51:34 -07:00

flash.c

[clang-tidy] fix bugprone-too-small-loop-variable warnings (#9321 )

2023-08-01 16:52:34 -07:00

infra_if.c

[dhcp6] obsolete DHCPv6 Server Unicast Option per RFC 9915 (#13146 )

2026-05-27 10:31:00 -07:00

logging.c

[platform] implement otPlatLogOutput platform API (#12762 )

2026-03-25 21:21:24 -05:00

mdns_socket.c

[posix] update mdns-socket to support one-shot multicast DNS queries (#12558 )

2026-02-25 21:34:14 -06:00

misc.c

[otns] add default (weak) OTNS platform API implementation in core (#12308 )

2026-01-22 10:49:37 -08:00

multipan.c

[spinel] add support for multiple spinel interfaces (#9360 )

2023-11-28 16:16:37 -08:00

openthread-core-simulation-config.h

[sub-mac] redo security processing for every (re)transmission (#13093 )

2026-05-26 10:36:55 -07:00

platform-config.h

[simulation] add APIs for select() based event loop (#12135 )

2025-11-18 22:19:04 -08:00

platform-simulation.h

[simulation] set virtual UART at runtime (#12199 )

2025-12-09 08:48:37 -08:00

radio.c

[simulation] use the CSL receiver's peer address to include CSL IE (#11905 )

2025-09-29 18:24:38 -07:00

README.md

[build] remove autotools (#9027 )

2023-06-28 08:54:23 -07:00

simul_utils.c

[simulation] increase socket receive buffer size to 2MB (#13173 )

2026-05-28 16:52:16 -07:00

simul_utils.h

[simulation] set virtual UART at runtime (#12199 )

2025-12-09 08:48:37 -08:00

spi-stubs.c

[clang-format] use AllowShortFunctionsOnASingleLine: All (#8502 )

2022-12-08 09:34:05 -08:00

system.c

[simulation] add APIs for select() based event loop (#12135 )

2025-11-18 22:19:04 -08:00

trel.c

[trel] detect and handle socket addr discrepancy for TREL peers (#10869 )

2024-12-18 20:35:58 -08:00

uart.c

[simulation] set virtual UART at runtime (#12199 )

2025-12-09 08:48:37 -08:00

README.md

OpenThread Simulation on POSIX

This directory contains example platform drivers for simulation on POSIX.

Build Examples

$ cd <path-to-openthread>
$ mkdir build && cd build
$ cmake -GNinja -DOT_PLATFORM=simulation ..
$ ninja

After a successful build, the elf files are found in:

<path-to-openthread>/build/examples/apps/cli
<path-to-openthread>/build/examples/apps/ncp

Interact

Spawn the process:

$ cd <path-to-openthread>/build/simulation/examples/apps/cli
$ ./ot-cli-ftd 1

Type help for list of commands.

> help
help
channel
childtimeout
contextreusedelay
extaddr
extpanid
ipaddr
keysequence
leaderweight
mode
netdata register
networkidtimeout
networkkey
networkname
panid
ping
prefix
releaserouterid
rloc16
route
routerupgradethreshold
scan
start
state
stop