Send "device offline" notifications based on MQTT LWT

@robin13 wrote:

Using tasmota devices with mqtt, they send LWT (Last Will and Testament) messages when they leave.
e.g. this retained message

gen-01/tele/LWT Online

becomes

gen-01/tele/LWT Offline

I would like to use this to send notifications when particular devices go offline. I’m not sure though if these LWT messages are being noted by hassio… I have used auto-discovery for the tasmota devices, so I’m not even sure what the complete configuration is for these. I have been searching, but the mqtt device tracker seems to be more for identifying locations and not for identifying online/offline. Any ideas or examples?

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