The current version of OpenLDAP in OpenWrt is 2.6.4. I couldn't find any 2.3.32 build of OpenLDAP, and I went back to 17.01. I suspect you are not using official OpenWrt but rather a fork (the path suggests Ruckus' fork for the R770).
You have two options:
Switch to a supported OpenWrt build (23.05 at the time of this writing)
Issue is password is not going in a BindRequest message on openWrt(not working) framework. But whereas on the other framework like buildroot(working) password is going in BindRequest message to LDAP server in a BindRequest.
So, to solve the above issue in openWrt framework, do I need to upgrade OpenLDAP to 2.6.4 from 2.3.32 on openWrt framework? Or is there any other solution to solve above password not included problem on openWrtBindRequest message. Please help to confirm.
It appears you are using firmware that is not from the official OpenWrt project.
When using forks/offshoots/vendor-specific builds that are "based on OpenWrt", there may be many differences compared to the official versions (hosted by OpenWrt.org). Some of these customizations may fundamentally change the way that OpenWrt works. You might need help from people with specific/specialized knowledge about the firmware you are using, so it is possible that advice you get here may not be useful.
Ask for help from the maintainer(s) or user community of the specific firmware that you are using.
Provide the source code for the firmware so that users on this forum can understand how your firmware works (OpenWrt forum users are volunteers, so somebody might look at the code if they have time and are interested in your issue).
If you believe that this specific issue is common to generic/official OpenWrt and/or the maintainers of your build have indicated as such, please feel free to clarify.