Hello Alejandro,
since you've mentioned that you started with HCP already, you may try its IoT Services out .
1. Official documentation SAP HANA Cloud Platform Internet of Things (IoT) Services
2. Getting started SCN post Try out the SAP HANA Cloud Platform Internet of Things (IoT) Services
3. IoT Starter Kit on GitHub SAP/iot-starterkit · GitHub (which also provides code examples for the RaspberryPi and GrovePi)
Which exactly platform and sensors you need depend on your usecase but you can already start with IoT on HCP Trial without any hardware.
Regards,
Anton