I've marked this as Qt 5.8 as I believe it will be compiled into the Qt 5.8 release but I'm not sure. I'm using the wip/win branch of qtconnectivity.

In an application I connect to a device and send data, then continue sending data from a buffer in the characteristic written callback... The problem is that this callback is fired on windows (I mean windows exe not windows UWP) right after Qt writes the characteristic. The peripheral device sends a message back each time a characteristic is written but Qt doesn't get this until every characteristicwritten callback has been fired.

Expected:

<write characteristic>
<characteristic written callback>
<write characteristic again from within callback>
<characteristic changed callback with new value from peripheral device>
<characteristic written callback>
<write characteristic again from within callback>
<characteristic changed callback with new value from peripheral device>
...

Actual:
<write characteristic>
<characteristic written callback>
<write characteristic again from within callback>
<characteristic written callback>
<write characteristic again from within callback>
<characteristic written callback>
<write characteristic again from within callback>
<characteristic changed callback with new value from peripheral device>
<characteristic changed callback with new value from peripheral device>
<characteristic changed callback with new value from peripheral device>
<characteristic changed callback with new value from peripheral device>