http://techdebug.com/blog/2015/09/16/packer-vmware-iso-builder-esxi-without-dhcp/

PackerBaseWin2012R2-VMWare.json

{
  "variables": {
    "clusterName": "",
    "datacenterName": "",
    "hostName": "",
    "ESXusernameText": "",
    "ESXpasswordText": "",
    "user": "",
    "password": "",
    "vm_nameText": "",
    "vm_networkName": "",
    "vm_disksize": "",
    "vm_diskmode": "",
    "datastoreName": "",
    "output_directoryName": "",
    "autounattend_file": "",
    "userdata_file": ""
  },
  "builders": [
    {
      "type": "vmware-iso",
      "vm_name": "{{user `vm_nameText`}}",
      "output_directory": "{{user `output_directoryName`}}",
      "iso_url": "iso/en_windows_server_2012_r2_vl_with_update_x64_dvd_6052766.iso",
      "iso_checksum_type": "md5",
      "iso_checksum": "9a00defab26a046045d939086df78460",
      "headless": true,
      "communicator": "winrm",
      "winrm_username": "{{user `user`}}",
      "winrm_password": "{{user `password`}}",
      "winrm_timeout": "60m",
      "remote_type": "esx5",
      "remote_host": "{{user `hostName`}}",
      "remote_username": "{{user `ESXusernameText`}}",
      "remote_password": "{{user `ESXpasswordText`}}",
      "remote_datastore": "{{user `datastoreName`}}",
      "tools_upload_flavor": "windows",
      "boot_wait": "10m",
      "shutdown_timeout": "1h",
      "shutdown_command": "shutdown /s /t 10 /f /d p:4:1 /c \"Packer Shutdown\"",
      "guest_os_type": "windows8srv-64",
      "disk_size": "{{user `vm_disksize`}}",
      "disk_type_id": "{{user `vm_diskmode`}}",
      "vnc_port_min": 5800,
      "vnc_port_max": 5999,
      "floppy_files": [
        "{{user `autounattend_file`}}",
        "{{user `userdata_file`}}"
      ],
      "vmdk_name": "{{user `vm_nameText`}}",
      "vmx_data": {
        "remotedisplay.vnc.enabled": "TRUE",
        "remotedisplay.vnc.port": "5815",
        "memsize": "2048",
        "numvcpus": "1",
        "scsi0.virtualDev": "lsisas1068",
        "annotation": "DSC-Base-Windows-{{timestamp}}",
        "ethernet0.networkName": "{{user `vm_networkName`}}",
        "ethernet0.present": "TRUE",
        "ethernet0.virtualDev": "e1000e",
        "ethernet0.addressType": "vpx"
      }
    }
  ],
  "provisioners": [
    {
      "type": "powershell",
      "elevated_user": "{{user `user`}}",
      "elevated_password": "{{user `password`}}",
      "inline": [
        "invoke-expression ((new-object net.webclient).DownloadString('https://chocolatey.org/install.ps1'))"
      ]
    },
    {
      "type": "powershell",
      "elevated_user": "{{user `user`}}",
      "elevated_password": "{{user `password`}}",
      "inline": [
        "choco install -y powershell -pre"
      ]
    },
    {
      "type": "powershell",
      "inline": [
        "echo \"Restart Computer\"; Start-Sleep 5; Restart-Computer -force"
      ]
    },
    {
      "pause_before": "120s",
      "type": "powershell",
      "inline": [
        "(Get-Host).Version"
      ]
    },
    {
      "type": "powershell",
      "elevated_user": "{{user `user`}}",
      "elevated_password": "{{user `password`}}",
      "inline": [
        "tzutil.exe /s 'AUS Eastern Standard Time'",
        "Get-PackageProvider -Name NuGet -ForceBootstrap",
        "Add-Content C:\\Windows\\System32\\drivers\\etc\\hosts '172.1.0.10 dsc.localnet'",
        "Register-PSRepository -Name MyDSC -SourceLocation 'http://dsc.localnet:8080/nuget/PowerShellModules' -InstallationPolicy Trusted"
      ]
    },
    {
      "type": "powershell",
      "elevated_user": "{{user `user`}}",
      "elevated_password": "{{user `password`}}",
      "inline": [
        "Set-AutoLogon -State Enabled",
        "Register-WorkflowScheduledTask -STName Start-VMBuild -Command2Run Create-BuildDSCNodeWorkFlow"
      ]
    }
  ]
}