TCP Connection Error on API29

[bannsec]

Trying to use python adb to connect to an emulated API29 device over TCP. Failing spectacularly.

In [6]: d = device.ConnectDevice(serial="127.0.0.1:5554")
---------------------------------------------------------------------------
InvalidCommandError Traceback (most recent call last)
<ipython-input-6-7567c46f5431> in <module>
----> 1 d = device.ConnectDevice(serial="127.0.0.1:5554")

~/.virtualenvs/frida/lib/python3.6/site-packages/adb/adb_commands.py in ConnectDevice(self, port_path, serial, default_timeout_ms, **kwargs)
 140 timeout_ms=default_timeout_ms)
 141
--> 142 self._Connect(**kwargs)
 143
 144 return self

~/.virtualenvs/frida/lib/python3.6/site-packages/adb/adb_commands.py in _Connect(self, banner, **kwargs)
 171 banner = socket.gethostname().encode()
 172
--> 173 conn_str = self.protocol_handler.Connect(self._handle, banner=banner, **kwargs)
 174
 175 # Remove banner and colons after device state (state::banner)

~/.virtualenvs/frida/lib/python3.6/site-packages/adb/adb_protocol.py in Connect(cls, usb, banner, rsa_keys, auth_timeout_ms)
 312 data=b'host::%s\0' % banner)
 313 msg.Send(usb)
--> 314 cmd, arg0, arg1, banner = cls.Read(usb, [b'CNXN', b'AUTH'])
 315 if cmd == b'AUTH':
 316 if not rsa_keys:

~/.virtualenvs/frida/lib/python3.6/site-packages/adb/adb_protocol.py in Read(cls, usb, expected_cmds, timeout_ms, total_timeout_ms)
 245 if not command:
 246 raise InvalidCommandError(
--> 247 'Unknown command: %x' % cmd, cmd, (arg0, arg1))
 248 if command in expected_cmds:
 249 break

InvalidCommandError: ('Unknown command: 72646e41', 1919184449, (543451503, 1936617283))