Created question in FIWARE Q/A platform on 16-07-2019 at 19:07
Please, ANSWER this question AT https://stackoverflow.com/questions/57062728/iot-agent-plus-mqtt-invoking-command-as-a-measurement

Question:
IoT Agent plus MQTT - invoking command as a measurement

Description:
I'm using IoTAgent over MQTT configuration. After going step by step with the tutorial presented on FIWARE's website is there a way to invoke command using measurment input of the IoT Agent?

Let's say i have 2 arduinos: one is an actuator and the other one is a sensor. The actuator has LED attached, sensor has a button. I want to send a message from sensor-arduino with command ON (to MQTT Broker or directly as an Ultralight message via HTTP - as far as I tested IoTA for Ultralight can run simultaneously both modes which is great) what will invoke sending the command defined for given device.

Let's say im using this config:

I can invoke command like this (which is very inconvenient):

Or after registering the command, I can use Orion Context Broker:

Those approaches give me a response in Mosquitto subscriber.

How can I create a message sent to IoTAgent (via MQTT or HTTP) that will invoke command sent to MQTT Broker? The command is furhter managed in actuator-arduino as long as is received in the MQTT Broker.