Before authentication token expires, we get new one with refresh_token. But how to use it in existing connection? Do we send another RSSL_DMT_LOGIN request?
Couldn't find clear description of this process in case of secure socket connection in ETA.
Yes, the application must re-issue a Login request with an new access token in the AuthenticationToken attribute. You can find more detail in Value Add Developers Guide section 7.3.2 Login Reissue