问下这个udid在android上是指的什么,成功启动服务后也一直在loading about app-inspector HOT 9 CLOSED

Android device started: 203e1f90

$ adb -s 203e1f90 shell
shell@android:/ $ echo hello
hello

shell>app-inspector -u 203e1f90  --verbose
>> server.js:15:12 [master] pid:1891 server start with config:
 { port: 5678,
  verbose: true,
  udid: '203e1f90',
  ip: '10.6.24.99',
  host: 'XXXXXdeMacBook-Air.local',
  loaded_time: '2016-08-26 11:26:13' }
>> inspector start at: http://10.6.24.99:5678
  <-- GET /
  --> GET / 200
  <-- GET /
  --> GET / 200

> [email protected] install /Users/XXXXX/git/nvm/versions/node/v6.2.0/lib/node_modules/app-inspector/node_modules/uiautomator-client
> node ./scripts/build.js

JAVA_HOME is set to /Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home
Error: UI test projects can only target API 16 and above

/Users/feibaobao/git/nvm/versions/node/v6.2.0/lib/node_modules/app-inspector/node_modules/uiautomator-client/scripts/build.js:164
      throw e;
      ^

Error: setup failed
    at ChildProcess.createProcess.on.code (/Users/feibaobao/git/nvm/versions/node/v6.2.0/lib/node_modules/app-inspector/node_modules/uiautomator-client/scripts/build.js:120:16)
    at emitTwo (events.js:106:13)
    at ChildProcess.emit (events.js:191:7)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:204:12)