Resolution: Set Host Code Page and Net Code Page with tibems_SetCodePages() in EMS client API for IBM iOS.
Refer to the EMS IBM client documentation -> Chapter 17 IBM z/OS and IBM i : IBM EBCDIC Platform Calls : tibems_SetCodePages(). For example, the Host Code Page is set for the following languages:
Greek Language: 00875
Russian: 01025
Slovakian, Hungarian, and Czech: 00870
The Net Code Page is set to 01208. 1208 is the code page for UTF-8 on IBM iOS. Refer to https://www-01.ibm.com/software/globalization/ccsid/ccsid_registered.html.