// Create a certificate with an IP address in the subject alt name.
    val heldCertificate =
      HeldCertificate.Builder()
        .commonName("example.com")
        .addSubjectAlternativeName(localIpAddress!!)
        .build()
    val handshakeCertificates =
      HandshakeCertificates.Builder()
        .heldCertificate(heldCertificate)