liuyc

**ENHANCEMENT** 1. Describe the enhancement you are requesting. Enhancements include: - documentation 2. Indicate the importance of this enhancement to you (must-have, should-have, nice-to-have). nice-to-have

**FEATURE REQUEST** 1. Is there an open issue addressing this request? If it does, please add a "+1" reaction to the existing issue, otherwise proceed to step 2. no 2....

**FEATURE REQUEST** 1. Is there an open issue addressing this request? If it does, please add a "+1" reaction to the existing issue, otherwise proceed to step 2. no 2....

I found code for it https://github.com/mochi-mqtt/server/pull/90/files , But not in the latest version of the code