Not support SteamVR 2.0, old version SteamVR only.

You need rollback to "v1527117754 - 6/21/2018 hotfix" SteamVR version.
You can see from https://github.com/mmorselli/Joy2OpenVR
Test success in 20190213.

• 20190304 - 強制回復到 SteamVR v1527117754 發現Room setting 無法執行
  解決辦法 進入 $PATH/Steam/steamapps/common/SteamVR/tools/steamvr_room_setup/win64/steamvr_room_setup.exe
  執行 steamvr_room_setup.

SteamVR Tracking without an HMD (Only use VIVE Tracker)

StreamVR (WIN 10) - OpenVR  

Step 1: 路徑 C:\Program Files (x86)\Steam\logs\vrserver.txt   找出 vrsettings 位置

[Settings] ... C:\Program..\Steam\steamapps\common\SteamVR\resources\settings\default.vrsettings  
[Settings] ... C:\Program..\Steam\steamapps\common\SteamVR\drivers\htc\resources\settings\default.vrsettings  
[Settings] ... C:\Program..\Steam\steamapps\common\SteamVR\drivers\lighthouse\resources\settings\default.vrsettings  
[Settings] ... C:\Program..\Steam\steamapps\common\SteamVR\drivers\null\resources\settings\default.vrsettings  
[Settings] ... C:\Program..\Steam\config\steamvr.vrsettings  

Step2: 修改 resources\settings\default.vrsetting
將內容修改成

"requireHmd" : false  
"forcedDriver" : "null"  
"activateMultipleDrivers" : true  

Step3: 修改 null\resources\settings\default.vrsettings
將內容修改成

{
	"driver_null" : {
		"enable" : true,
		"serialNumber" : "Null Serial Number", 
		"modelNumber" : "Null Model Number",
		"windowX" : 0,
		"windowY" : 0,
		"windowWidth" : 2160,
		"windowHeight" : 1200,
		"renderWidth" : 1512,
		"renderHeight" : 1680,
		"secondsFromVsyncToPhotons" : 0.01111111,
		"displayFrequency" : 90.0
	}
}

完成後 SteamVR圖示會變更.

Step4: Unity OpenVR 調整
開啟 Unity, 將 SteamVR Camera 的Target eye 改為 none,
[CameraRig] 的 Left, Right, 改為 Tracker1, Tracker2
Tracker1, Tracker2 的 index 改為 1 跟 2.

VIVE 頭盔 跟 手把 兩個皆可不使用.
只使用Tracker.

Reference.

1. http://help.triadsemi.com/steamvr-tracking/steamvr-tracking-without-an-hmd
2. http://www.pencilsquaregames.com/getting-steamvr-tracking-data-in-unity-without-a-hmd/

Issue

1. Tracker 按鈕無法使用
   日期 20180828
   解決方法:

From: https://steamcommunity.com/app/250820/discussions/6/1759104780482398473/

選擇 SteamVR v1527117754