Repository navigation
MQTT subscribe Remaining Length encoding is incorrect #969
Description
Activity
Opened #1142 with a minimal fix: encode Remaining Length for subscribe and unsubscribe as a Variable Byte Integer, matching the existing
publishpattern, plus mock on-wire tests for short and long topics.- added a commit that references this issue
on Jul 28, 2026 - added a commit that references this issue
on Aug 22, 2026
See this discussion for background, also MQTT spec V3.1.1 section 2.2.3.
This may be academic as its main impact is if the
topicfield is long. This is to record the existence of the issue.The current encoding stores
Remaining Lengthin a byte. It should be stored as a Variable Byte Integer as per .publish. This will cause a failure ifRemaining Lengthis greater than 127, therefore imposing a limit on the length of thetopicfield.I can submit a PR if the maintainers think this is worth fixing.