Add Attachments in any Transaction through OData services

Hello Expert,

i have a requirement from which user's take picture from Frontend device (Develop in sencha app & Cordova) converting it to binary format and pass the data to backend calling ODATA Services.
From backend we need to save those images in standard transaction attachment option (TCODE:-IW32,IW66,VA02 ) provided by SAP Only.

I have created a program using FM
1) BINARY_RELATION_CREATE_COMMIT
2) SO_DOCUMENT_REPOSITORY_MANAGER
3) SO_FOLDER_ROOT_ID_GET
Its working but it take file from local system but we need to pass data from
OData services.

Please Suggest.

Thanks
Sushil Kumar Shrivastava ..