SAP HCI is made as Integration Platform-as-a-Assistance (PAAS) which really helps to combine many impartial devices/apps for a business method. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid product. HCI features Adapters (Connectivity solutions) for instance: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4-hana-cloud-onboarding59371.dreamyblogs.com/28525561/hana-cloud-integration