ros2/rmw

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The ROS Middleware (rmw) Interface.

Stars: 120
Forks: 88
Open beginner issues: 0
Indexed issues: 24
Avg merge: 1d 19h
Merged PRs (30d): 1

Dominant language: C
License: Apache-2.0
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted

Beginner friendly Everything

Open All

24 open issues indexed

Missing stdbool.h import is breaking downstream C clients Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 42/100

ros2/rmw#424 · 4 comments · 3 reactions · Opened Aug 4, 2026
Service request timeouts missing in RCL → RMW interaction Open

enhancement

ros2/rmw#404 · 7 comments · 1 assignee · Opened Sep 16, 2025
Drop of messages with History "keep all" but not with "keep last" Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ros2/rmw#385 · 7 comments · Opened Dec 19, 2024
Service clients freeze on multi-client cases. Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

ros2/rmw#372 · 6 comments · Opened Jul 8, 2024
Interface for a function that returns the serialized size of a message Open

more-information-needed

Difficulty 5/5 Over a week Newbie friendliness 25/100

ros2/rmw#363 · 2 comments · Opened Jan 15, 2024
Ubuntu 22.04 BUG: Failed to delete datawriter in nav2_util tests Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

ros2/rmw#362 · 9 comments · Opened Dec 8, 2023
service introspection event does not have unique GID during transaction Open

bug

ros2/rmw#357 · 10 comments · 1 assignee · Opened Aug 25, 2023
Extend `names_and_types` to contain type hashes Open

ros2/rmw#356 · 10 comments · 1 assignee · Opened Jul 26, 2023
Configure maximum DDS participants in a generic way Open

enhancement help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

ros2/rmw#324 · 3 comments · 1 reaction · Opened Jun 23, 2022
Add documentation on uniqueness of node, topic, and service names Open

documentation question

ros2/rmw#323 · 1 comment · 1 assignee · Opened May 17, 2022
Change `rmw_take_response()` `request_header` param/variable name Open

backlog

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ros2/rmw#312 · Opened Aug 19, 2021
[feature request] Expose functionality to discover, read and send serialized services Open

enhancement help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

ros2/rmw#309 · Opened Jun 1, 2021
Clarify the error codes in serialized_message.h Open

backlog enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ros2/rmw#273 · Opened Sep 17, 2020
Push notification on publisher/subscription match Open

enhancement

ros2/rmw#264 · 3 comments · 1 assignee · Opened Aug 24, 2020
Add ability to pass in allocator for some methods Open

backlog enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

ros2/rmw#260 · 8 comments · Opened Aug 13, 2020
rmw_time_t is redundant with rcutils_duration_value_t and doesn't need to be a struct Open

backlog

Difficulty 4/5 3-5 days Newbie friendliness 32/100

ros2/rmw#215 · 9 comments · Opened Apr 20, 2020
rmw_publish can block Open

ros2/rmw#209 · 1 reaction · 1 assignee · Opened Mar 30, 2020
Expose sequence number for received messages Open

backlog enhancement help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

ros2/rmw#201 · 2 comments · 3 reactions · Opened Mar 14, 2020
move the functions from rmw.h into multiple separate files Open

backlog enhancement

ros2/rmw#197 · 2 comments · 1 assignee · Opened Feb 27, 2020
Expose resource limit QoS Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ros2/rmw#176 · 1 comment · Opened Jun 4, 2019
Publishers and Subscribers cause memory allocations in nodes where they are not matched by any local reader Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ros2/rmw#172 · Opened Apr 8, 2019
service_name length checks for different rmw_implementations Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ros2/rmw#136 · Opened Apr 26, 2018
Support static topologies Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

ros2/rmw#126 · 9 comments · 2 reactions · Opened Oct 23, 2017
The specified queue size/depth in rmw interface... Open

enhancement help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

ros2/rmw#13 · 6 comments · Opened May 19, 2015

ros2/rmw

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