Add SMPP TLSv1.2 configuration

[abao168899]

Add SMPP TLSv1.2 detection and configuration to the project.

• Add SmppTlsClient.java

  • Create a new class SmppTlsClient in the com.telesign.enterprise package.
  • Extend the com.telesign.RestClient class.
  • Add a constructor that accepts customerId, apiKey, and restEndpoint parameters.
  • Configure SSL/TLS settings using the javax.net.ssl package.
  • Set the desired encryption cipher for SMPP TLSv1.2.

• Modify VerifyClient.java

  • Import the javax.net.ssl package.
  • Add a method to configure SSL/TLS settings.
  • Set the desired encryption cipher for SMPP TLSv1.2.

• Modify MessagingClient.java

  • Import the javax.net.ssl package.
  • Add a method to configure SSL/TLS settings.
  • Set the desired encryption cipher for SMPP TLSv1.2.

• Update README.md

  • Add a section about SMPP TLSv1.2 configuration.
  • Provide instructions on how to set the desired encryption cipher.

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[LanaJ11]

Hi @abao168899,

Thanks for your contribution and for taking the time to propose this enhancement.

After technical review, we've concluded that we aren't able to move forward with this implementation. The Telesign Java SDK is REST-based and does not handle SMPP connections directly. As a result, any SMPP-level configuration within the SDK would not affect carrier connectivity.

Please don't hesitate to submit other ideas or enhancements in the future, we're always happy to review new proposals. Thanks again!