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Co-authored-by: CaCO3 <caco@ruinelli.ch>

docs/MQTT-API.md

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+# General Information
+The device is capable to register to a MQTT broker to publish data and subscribe to specific topics.
+
+The MQTT service has to be enabled and configured properly in the device configuration via web interface (`Settings` -> `Configuration` -> section `MQTT`)
+
+The following parameters have to be defined:
+* URI
+* MainTopic (optional, if not set, the hostname is used)
+* ClientID (optional, if not set, `AIOTED-` + the MAC address gets used to make sure the ID is unique)
+* User (optional)
+* Password (optional)
+* RetainFlag (optional)
+
+# Published topics
+
+## Status
+`MainTopic`/{status topic}, e.g. `watermeter/status`
+* ### Connection
+
+* ### Interval
+
+* ### MAC
+
+* ### IP
+
+* ### Hostname
+
+* ### Uptime
+
+* ### FreeMem
+
+* ### WifiRSSI
+
+* ### CPUTemp
+
+* ### Status
+
+## Result
+`MainTopic`/{NumberName}/{result topic}, e.g. `watermeter/main/value`
+
+* ### Value
+
+* ### Raw
+
+* ### Error
+
+* ### JSON
+
+* ### Rate
+
+* ### Rate_per_time_unit
+  The time Unit gets set with the Homeassistant Discovery, eg. `h` or `m` (minutes)
+
+* ### Rate_per_digitalization_round
+  The `interval` defines when the next round gets triggered
+
+* ### Changeabsolut
+
+* ### Timestamp
+
+* ### JSON
+  All relevant results in JSON syntax
+
+## GPIO
+`MainTopic`/{GPIO topic}, e.g. `watermeter/GPIO/GPIO12`
+
+* ### GPIO/GPIO{PinNumber}
+  Depending on device configuration (`Settings` --> `Configuration` --> Chapter `GPIO`)
+
+
+# Subscibed topics
+`MainTopic`/{subscribed topic}, e.g. `watermeter/ctrl/flow_start`
+
+## Control
+
+* ### Ctrl/flow_start
+  Trigger a flow start by publishing to this topic (any character, length > 0)
+
+* ### GPIO/GPIO{PinNumber}
+  Depending on device configuration (`Settings` --> `Configuration` --> Chapter `GPIO`)