One of the metrics I am interested in having in my Home Assistant dashboard is the number of Android ADB devices are connected at a given time. There are occasionally times when devices reboot and connections are not automatically re-established. This poses a problem when attempting to control these devices.
One way to combat this is to have a sensor that is able to get the status of the total number of connected ADB devices and display the in a gauge in HA.
type: gauge
entity: sensor.adb_total_devices_connected
min: 0
theme: default
name: ADB Connected
severity:
green: 2
yellow: 1
red: 0
max: 2
In this example I have two devices that should be connected, setting green, yellow, red and max accordingly just makes for a prettier display.
Under the Hood
Now that we went over how to display the data, let’s discuss how to actually obtain it. For this I use a command line sensor.
- platform: command_line
command: adb devices | sed '1d;$d' | sed 's/\<device\>//g' | wc -l
name: ADB Total Devices Connected
scan_interval: 300
If we run this command directly from the command line we can see the information broken down from the standard output of adb devices.
While this is just a rudimentary display of the devices connected, future uses could be to trigger a script to attempt to re-connect devices and notify of potential errors. The sky is the limit.
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