just a followup, I was trying to improve DFU speed and at least with adafruit bootloader (where the MTU can be already negotiated at 247 without my changes) it was really matter of just increasing length of characteristics here from 20 to 244 and recompile. Then flashing 150KB zip with my python dfu flashing code took 32 seconds instead of 2 minutes and 6 seconds (when writing 244 bytes instead of 20). And it is even backward compatible with nrfconnect - at the slower speed, it still writes just 20 bytes to the characteristics.
BTW is there any way to discover characteristics length remotely? I can't find it anywhere in nrfconnect, maybe that is not part of the information that can be discovered about services/characteristics?
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