(Canned Reply: ABG- Export & Upload .aia)
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Sliders have been known to trigger more often than can be handled.
An Alternative approach is to use a Clock Timer to check the Slider Thumb position and only send its value if it has changed since the last cycle. Add an extra global variable for the previous value.
Also, it is a good idea to verify connection before trying to send something.
Be sure your BLE version is current:
You might not need that permission code if you are using the current BLE extension.