Last notification is never seen by upload script

[jagheterfredrik]

Thanks for your work on all things BLE!

It seems that the default onComplete handler's use of vTaskDelay blocks the Bluetooth stack on my single core ESP32-C3, which leads to the upload script never receiving the last ACK notification. I solved it by registering a custom onComplete handler which instead sets a reboot flag+time read by the loop() but might be worth at least documenting.

[h2zero]

Thanks @jagheterfredrik, I'll look to update this.