telnet连接Android模拟器后，输入命令时出现"KO: unknown command, try 'help' "

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今天想在模拟器上测试以下接听电话相关的功能，通过telnet连接模拟器成功后，输入命令时却出现错误

$ telnet localhost 5554
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Android Console: Authentication required
Android Console: type 'auth <auth_token>' to authenticate
Android Console: you can find your <auth_token> in 
'/home/username/.emulator_console_auth_token'
OK
gsm call 111111
KO: unknown command, try 'help'

然后按照提示输入help：

help
Android console command help:

    help|h|?         print a list of commands
    avd              control virtual device execution
    aut