Fifteen days is prohibited by the UN as prolonged solitary confinement under the Mandela Rules.
His situation now appears unchanged except that he was visited last Thursday by two officials from Australia's High Commission. It has not yet been reported what was discussed, but if consistent with that government's action to date this would be an exercise to wash their hands of him, much as Ecuador appears to be doing.
According to Glenn Greenwald's interview of Rafael Correa, former President of Ecuador, in 2016 his "government told Assange that it thought his attacks on Hillary Clinton were becoming excessive and briefly suspended his Internet connection to underline its concerns." Correa then qualified this by saying, "We never intended to take away his Internet for an extended period of time. That is going way too far."
By the standards of the UN it was going too far anyway, since from July 2016 it "condemns unequivocally measures to intentionally prevent or disrupt access to or dissemination of information online."