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We are shoe-horning BLE into an existing device, and unfortunately this device has a very limited display and can only display 4 digits.

We would like to use Numeric Comparison mode for the best security, but it generates a PIN that is 6 characters long. Is there any way to tweak the iOS "device wants to pair" dialog to show 4 digits? Or even take over the dialog completely to show the user a more exact representation of how the PIN will be displayed on our particular device? I'm pretty sure there's no way to tell BLE to generate a 4-digit PIN ...

Betty Crokker
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  • Not sure what you mean. You can't display every six digit decimal number as a four digit decimal hex number, so what do you want to show as 4 hex digits? – Thern Mar 09 '18 at 08:57
  • Good point, my bad, even 4 hex digits doesn't do the job. I'll remove that part of my post. – Betty Crokker Mar 09 '18 at 17:59

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