Device Tracker, detecting (Samsung) Android Phone

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I have tried with ping and nmap to reliably detect my Samsung Galaxy S8. I have not gotten that to work well.

Since I don’t have a router which is supported by Device Tracker I created my own solution because I did know that I can reliably detect it using the command arping(8).

Script:

#!/bin/bash

# This script uses arping(1) to detect if a Samsung Galaxy Android phone is on the network
# using a given IP. This phone is not detectable with ping or nmap in a reliable manner.

HOST=$1

/usr/bin/arping -q -I eth1 -f -c 10 $HOST

if [ "$?" -eq 0 ]; then
   # Host is alive
   echo HOME
else
   # Host is dead
   echo AWAY
fi

configuration.yaml:

binary_sensor:
  - platform: command_line
    name: Detect Phone
    command: /home/homeassistant/bin/detect_galaxy.sh 192.168.1.100
    payload_on: 'HOME'
    payload_off: 'AWAY'
    scan_interval: 300

automation.yaml:

  - alias: Change device tracker phone to home based on binary sensor
    initial_state: True
    hide_entity: False
    trigger:
      - platform: state
        entity_id: binary_sensor.detect_phone
        from: 'off'
        to: 'on'
    action:
      - service: device_tracker.see
        data:
          dev_id: phone
          location_name: home
  - alias: Change device tracker phone to away based on binary sensor
    initial_state: True
    hide_entity: False
    trigger:
      - platform: state
        entity_id: binary_sensor.detect_phone
        from: 'on'
        to: 'off'
    action:
      - service: device_tracker.see
        data:
          dev_id: phone
          location_name: not_home
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