Monitoring XR18/ X32 while using tablet/phone


How do you monitor with headphones when using a tablet or phone to control an XR18, X32 when in the need of soloing a channel? 

As it only transfers commands and not audio you have to plug your cans in the mixer or use wireless beltpacks... 

So I would like to know how do you approach this.

Thanks in advance to all comments and suggestions.