mqtt support

[kefalle]

No description provided.

[Ocean-lhy]

Hi @kefalle,

Thank you for your contribution and welcome to the project! We really appreciate you taking the time to add MQTT support.

However, I noticed that the PR description is currently empty. Because this is a relatively large feature (modifying 10 files), it's difficult for us to review the code effectively without some context.

Could you please edit the PR description and provide some details? It would be very helpful to include:

Motivation: What specific use cases does this MQTT support address?
Implementation details: A brief overview of how it works.
Testing: How did you test this feature?
Additionally, since the main branch has recently been updated to v0.2.0, this PR currently has merge conflicts. You will need to pull the latest changes from main and resolve these conflicts first.

Once the description is updated and the conflicts are resolved, please let us know, and we will be happy to proceed with a detailed code review. Let me know if you need any help with the merge conflicts!

Thanks again!