The connection of S/4HANA to the IoT (internet of Things)is a major part of the digital transformation.
In order to stay aligned with the overall simplification from an IT and Business Process perspective, SAP is providing IoT services via the HCP HANA Cloud Platform, means the IoT connection is build outside the core S/4HANA release and deployment windows and therefore enables rapid innovation cycles.
https://blogs.saphana.com/2015/07/22/trusted-platforms-key-internet-things-success/
HCP offers free developer licenses:
Try out SAP HANA Cloud Platform Internet of Things (IoT) Services (BETA)
SAP HANA Cloud Platform Developer Center
My first stab at using HCP IoT Service (BETA) Part 1 of 2
My first stab at using HCP IoT Service (BETA) Part 2 of 2
ESP8266 and HCP Internet Of Things Services (BETA) - Part 1
ESP8266 and HCP Internet Of Things Services (BETA) - Part 2
ESP8266 and HCP Internet Of Things Services (BETA) - Part 3
RaspberryPi on SAP HANA Cloud Platform
RaspberryPi on SAP HCP - IoT blog series part 1: Setting-up your RaspberryPi
Raspberry Pi on SAP HANA Cloud Platform - without Java - Part 1: XSODATA Backend
RaspberryPi on SAP HCP - IoT blog series part 2: Receiving the sensor values in the cloud
RaspberryPi on SAP HCP - IoT blog series part 4: Create an SAPUI5 dashboard
RaspberryPi on SAP HCP - IoT blog series part 5: Add additional virtual sensors to your dashboard
RaspberryPi on SAP HCP - IoT blog series part 6.1: Getting productive with IoT Services