README.md: add MQTT documentation

README.md

@@ -132,8 +132,20 @@ View API <a href="https://swagger-ui.serkri.be/" target="_blank">https://swagger
 
 Have an idea for the API? Edit it here <a href="https://swagger-editor.serkri.be/" target="_blank">https://swagger-editor.serkri.be/</a> and copy/paste it in a new issue with your request (https://github.com/serkri/SmartEVSE-3/issues)
 
+# MQTT support
+Your SmartEVSE can now export the most important data to your MQTT-server. Just fill in the configuration data on the webserver and the data will automatically be announced to your MQTT server.
+
 # Integration with Home Assistant
-If you want to integrate your SmartEVSE with Home Asisstant, please have a look at [the SmartEVSE `custom_component` for Home Assistant](https://github.com/dingo35/ha-SmartEVSEv3). This `custom_component` uses the API to share data from the SmartEVSE to Home Assistant, and enables you to set SmartEVSE settings from Home Assistant. You will need firmware version 1.5.2 or higher to use this integration.
+There are three options to integrate SmartEVSE with Home Assistant:
+* through the HA-integration - the easy way
+    If you want to integrate your SmartEVSE with Home Asisstant, please have a look at [the SmartEVSE `custom_component` for Home Assistant](https://github.com/dingo35/ha-SmartEVSEv3). This `custom_component` uses the API to share data from the SmartEVSE to Home Assistant, and enables you to set SmartEVSE settings from Home Assistant. You will need firmware version 1.5.2 or higher to use this integration.
+
+* by manually configuring your configuration.yaml
+    Its a lot of work, but you can have everything exactly your way. See examples in the integrations directory of our github repository.
+
+* by MQTT
+    If you don't like the integration, e.g. because it only updates its data every 60 seconds, you might like to interface through MQTT; updates are done as soon as values change.... you can even mix it up by using both the integration AND the MQTT interface at the same time!
+
 
 # Modbus TCP bridge