Enable http proxy support for mqtt3

[tg892580]

The code change allows Paho mqtt3 client which is running behind a http proxy is able to communicate to mqtt broker in outside world.
If the Http Proxy is configured, the new code will establish a TCP tunnel between mqtt client and the http proxy first, so that any further mqtt traffic to the mqtt broker will be routed through the TCP tunnel to the http proxy, which then forwards the traffic to the mqtt broker.

Signed-off-by: Tony Guo [email protected]

Please make sure that the following boxes are checked before submitting your Pull Request, thank you!

• This change is against the develop branch, not master.
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• If This PR fixes an issue, that you reference the issue below. OR if this is a new issue that
  you are fixing straight away that you add some Description about the bug and how this will fix it.
• If this is new functionality, You have added the appropriate Unit tests.

[sagarheroor]

@tg892580 & Others -- This patch has worked in our project, Can you please let me know if and when the patch will be merged for the release?
Really appreciate your work on this patch.

[tg892580]

I am glad that the patch helps your project. But I am not sure when the code will be released, we found the Paho code missing Http proxy support in our project and provided a solution, it is totally up to the Paho project team to review it and decide if the patch should be released.

…

On Wed, Jan 10, 2024 at 12:03 PM sagarheroor ***@***.***> wrote: @tg892580 <https://github.com/tg892580> & Others -- This patch has worked in our project, Can you please let me know if and when the patch will be merged for the release? Really appreciate your work on this patch. — Reply to this email directly, view it on GitHub <#1010 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AYNGCKXLNUR5ZHGRPTSVOOTYN3X25AVCNFSM6AAAAAA3QLZ7ICVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTQOBVGYZTIMZQHA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

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[sagarheroor]

[email protected]>
@rdasgupt -- I see most of the patches are merged by you.. Can you please help to merge this patch and release new version of paho library of java

[tg892580]

No, that must be other person, I never merged any branch yet. Can you talk to the project admin for help? Regards Tony

…

On Thu, Jan 11, 2024 at 7:53 PM sagarheroor ***@***.***> wrote: ***@***.***> @rdasgupt <https://github.com/rdasgupt> -- I see most of the patches are merged by you.. Can you please help to merge this patch and release new version of paho library of java — Reply to this email directly, view it on GitHub <#1010 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AYNGCKXOXONYIEC4L2S6XPLYOCXT7AVCNFSM6AAAAAA3QLZ7ICVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTQOBYGM4TGMRRGY> . You are receiving this because you were mentioned.Message ID: ***@***.***>

-- This electronic communication and the information and any files transmitted with it, or attached to it, are confidential and are intended solely for the use of the individual or entity to whom it is addressed and may contain information that is confidential, legally privileged, protected by privacy laws, or otherwise restricted from disclosure to anyone else. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, you are hereby notified that any use, copying, distributing, dissemination, forwarding, printing, or copying of this e-mail is strictly prohibited. If you received this e-mail in error, please return the e-mail to the sender, delete it from your computer, and destroy any printed copy of it.