Wake on Lan - switch status not working

[cgtobi]

Make sure you are running the latest version of Home Assistant before reporting an issue.

You should only file an issue if you found a bug. Feature and enhancement requests should go in the Feature Requests section of our community forum:

Home Assistant release (hass --version):
0.38.1

Python release (python3 --version):
Python 3.5.2

Component/platform:
Raspberry Pi 3 (with Ubuntu 16.04, virtualenv)

Description of problem:
Wake on lan works as expected, but the switch does not show the actual status of the device. When successfully woken the target host is not shown as 'on' even if its reachable via ping, nmap, ssh, etc. When triggered, it switches to 'on' for a second or two and than goes back to 'off'.

Expected:
The switch shows whether target host is 'online' or 'offline'.

Problem-relevant configuration.yaml entries and steps to reproduce:

switch:
  - platform: wake_on_lan
    name: "server"
    mac_address: "70-85-C2-AA-BB-FA"
    host: "192.168.1.30"

device_tracker:    
  - platform: nmap_tracker
    hosts: 192.168.1.1/24

Traceback (if applicable):

Additional info:

[rchiarelly]

Due to this bug I have been unable to use the web gui to trigger the turn_off activity. I have to call it via the remote

[vassilis-panos]

I confirm this. The switch does not show the status of the device.

[cgtobi]

This is still an issue with 0.39.1. Here is the discussion on the forum.

I wrote a little python script to ping the host the way HA does it but I only get what I expect, which doesn't really help in tracking down the root of the problem.

import platform
import subprocess as sp

DEFAULT_PING_TIMEOUT = 1
hosts = ('foo', '192.168.1.100', 'foo.local.')

for host in hosts:
    ping_cmd = 'ping -c 1 -W {} {}'.format(
                DEFAULT_PING_TIMEOUT, host)

    status = sp.getstatusoutput(ping_cmd)[0]
    print(host, status)

[cgtobi]

I made some tests and found that the virtual environment within the systemd service was missing a few paths.
So here is my fix. Edit your systemd service and add :/usr/bin to the line starting with Environment=PATH="$VIRTUAL_ENV/bin:.

e.g.

Environment=PATH="$VIRTUAL_ENV/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/bin:/sbin:/bin:$PATH"

Than simply sudo systemctl daemon-reload and restart home assistant or reboot.