DSI 1.4.0 (available in the CRAN) has been released with the following additional features:
failSafeparameter added to datashield.login(), to automatically ignore servers which connection failed.
errorcallback function parameters added to datashield.aggregate() and datashield.assign() (and sister assign functions), for Datashield client package developers willing to handle server operation success or failure as soon as they happen.
These changes are backward compatible with end-user code and do not affect packages implementing this API (such as DSOpal or DSLite). Upgrade to DSI 1.4.0 is then safe.