add better info to debug log when event server write fails
add better info to debug log when event server write fails

simonct/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,simonct/phd2,simonct/phd2,OpenPHDGuiding/phd2,simonct/phd2,simonct/phd2,simonct/phd2