MQTT Sensor monitoring with notify

Configuration
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Hi Guys, this is my first post. I’m using Home assistant with arduino board with mysensors library. I’m using arduino nano with ethernet shield and nrf24l01 module like a gateway, and arduino mini pro with nrf24l01 module like a node. Communication between arduino node/gateway and homeassistant using mqtt protocol. Actually i have some sensors (temperature, humidity ecc) connected to arduino node. Home assistant work correctly and i can see temperature, umidity ecc values in frontend. This is what I would like:

  • Monitoring node and sensor connected to it and send notify if there’s a problem .At this time, if i shutting down arduino node, home assistant leave the last read values in frontend.
  • Monitoring gateway and send notify if gateway will be unreacheable. I tried with ubus device tracker (i’ve openwrt router), but i think that home assistant search only mac adresses in wireless router interface. For my android phone, ubus device tracker works correctly.
    Do you have some idea how can i make it possible?
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Someone can help me?

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This sensor’s example shows a way to check if a device is up and running.

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I tried your solution but everytime i’ve the binary_sensor in off state.
I used this configuration:

  - platform: command_line
    name: gwhome_mon
    command: 'ping -c 1 192.168.x.x | grep "1 received" | wc -l'
    payload_on: 1
    payload_off: 0

sensor state:

{"attributes": {"friendly_name": "gwhome_mon"}, "entity_id": "binary_sensor.gwhome_mon", "last_changed": "2016-06-23T16:24:53.860569+00:00", "last_updated": "2016-06-23T16:24:53.860569+00:00", "state": "off"}

I tried with ping command inside a shell script, but with the same result! Why sensor don’t change the state?

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fabaff: starting fromyour example link, with some correction, now works fine. This is my binary sensor configuration:

  - platform: command_line
    name: gwhome_mon
    command: 'ping -c 1 192.168.x.x | grep "1 received" | wc -l'
    sensor_class: opening
    payload_on: "1"
    payload_off: "0"

Thanks for the info!!

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