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SpejsIoT

Warsaw Hackerspace IoT something. Because NIH. It all goes through central MQTT broker now.

Topic	Description
`iot/ DEVICE_ID /control`	read: device control; `restart` - reboot device; `ota` - start OTA
`iot/ DEVICE_ID /state`	write: `online` or `offline`, `offline` is set in last will
`iot/ DEVICE_ID /type`	write: device type, eg. `exhaust`, `vacuum`
`iot/ DEVICE_ID /ota`	write: OTA status, `started`, `finished`, `failed`
`iot/ DEVICE_ID / ENDPOINT`	value to set, or state change report, eg. `iot/123456/relay = 1`