Are you reading the bumps via bluetooth?
Yup! Directly from the robot with the RPi.
The next step would have been to run the Bluetooth reader from the PDI step "Execute a Process", clean up the output, prepend a timestamp and some other relevant data, then publish all this data out through the MQTT Published step to a MQTT Broker. This is similar to the Pentaho IoT Challenge you did in April.
Retrieving data ...