Asuswrt - devices go offline - Task exception was never retrieved

[Nutti85]

Home Assistant release with the issue:
0.83 and beyond. I'm running 0.83.3

Last working Home Assistant release (if known):
0.82 I believe

Operating environment (Hass.io/Docker/Windows/etc.):
Hassio

Component/platform:
Asuswrt device tracker
https://www.home-assistant.io/components/device_tracker.asuswrt/

Description of problem:
Does not update the state of devices. When setting up the component and rebooting HA the devices show as Home for a short period of time. Then they go to not_home and stay not_home.

Problem-relevant configuration.yaml entries and (fill out even if it seems unimportant):
configuration.yaml

asuswrt:
host: ***
username: ***
protocol: telnet
port: 23
password: ***

device_tracker:

• platform: asuswrt
  consider_home: 700
  interval_seconds: 60

Traceback (if applicable):

Traceback (most recent call last):
Error doing job: Task exception was never retrieved

  File "/usr/local/lib/python3.6/site-packages/homeassistant/components/device_tracker/__init__.py", line 709, in async_device_tracker_scan
    found_devices = await scanner.async_scan_devices()
  File "/usr/local/lib/python3.6/site-packages/homeassistant/components/device_tracker/asuswrt.py", line 42, in async_scan_devices
    await self.async_update_info()
  File "/usr/local/lib/python3.6/site-packages/homeassistant/components/device_tracker/asuswrt.py", line 58, in async_update_info
    self.last_results = await self.connection.async_get_connected_devices()
  File "/usr/local/lib/python3.6/site-packages/aioasuswrt/asuswrt.py", line 169, in async_get_connected_devices
    dev = await self.async_get_wl()
  File "/usr/local/lib/python3.6/site-packages/aioasuswrt/asuswrt.py", line 105, in async_get_wl
    lines = await self.connection.async_run_command(_WL_CMD)
  File "/usr/local/lib/python3.6/site-packages/aioasuswrt/connection.py", line 94, in async_run_command
    data = ((await self._reader.readuntil(self._prompt_string)).
  File "/usr/local/lib/python3.6/asyncio/streams.py", line 569, in readuntil
    offset)
asyncio.streams.LimitOverrunError: Separator is not found, and chunk exceed the limit

Additional information:

[oskretc]

same issue here

[kennedyshead]

kennedyshead/aioasuswrt@0fdfe29