Include call to deliver MQTT broker endpoints to access sensorics data

[langeipk]

The access to live sensor data of a certain environment would be beneficial for re use and interpretation. These are by their nature data streams. In BrAPI a pulling approach is used for the query. In the next specification we should consider the use of message oriented architectures from the IoT environment. For example, BrAPI publishes endpoints to MQTT Broker. You can then subscribe to messages here. This fits better with the nature of environmental sensor data and also with the volume of sensor measurement data, which in some cases, for example, at the IPK, sends new data in minutes. This is because events can sometimes occur briefly and spontaneously, such as gusts of wind or tamed sunlight in a greenhouse.