Upgrade to macOS Sierra and use the re-designed Console app. It now lists connected devices and allows advanced filtering and searching of the device logs, better than anything Xcode has been able to achieve in the past, e.g. by process name as shown in the screenshot below:
Note: this new app unfortunately uses 30% CPU while open, hopefully Apple can fix that, in the meantime be sure to quit it when mobile or endure serious battery drain.