It could be useful to send some messages with transaction incapsulated in Robonomic’s Lauch. In a nutshell, your robot should subscribe for events at some wallet, and your user should send transactions to it. Message should be short enought to be stored in transaction or stored in IPFS and accessible by hash. You could use Pinata as a easy solution for this hackathon
Detailed description could be found at Robonomic’s Wiki
We present to your ready to go Python scripts for subscriber and launcher. To start: