SAP HCI is made as Integration Platform-as-a-Assistance (PAAS) which really helps to combine many impartial devices/apps for a company course of action. HCI can perform Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid design. HCI gives Adapters (Connectivity possibilities) for instance: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, https://s4-hana-cloud-architectur13680.pointblog.net/hana-cloud-integration-69422323