extmod/modbluetooth: Add gap_unpair command. #7845
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This function deletes the pairing details from the DB on both the application and the radio, so can be used to free up IRK slots on the radio.
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This function deletes the pairing details from the DB on both the application and the radio, so can be used to free up IRK slots on the radio.
Note: this only works on nimble as pairing/bonding has not been fully implemented on other stacks.
Background
In my application, we have a stm327f765 chip running micropython, with a build of the official nimble uart/hci application running on a separate nrf52810 (https://github.com/apache/mynewt-nimble/tree/master/apps/blehci)
We use this with aioble and paring/bonding.
It's been found that this nimble hci radio only has buffer/storage for 4 RPA / IRK addressing lookups, so if you've got more devices than this stored in the pairing/bonding database, any new devices that come along and try to pair/bond seem to work initially, but upon disconnect/reconnect the pairing details are lost.
Also, if you've got more devices than this stored in the bond database, with the current inplementation of aioble the fact these are stored in a dict/json file means the order is not strictly controlled, so you can't know for certain which devices keys will be loaded first/last into the radio - which ever ones don't fit can fail to connect correctly.
As part of work to provide some control over this issue by allowing an application to limit the number of devices bonded, this gap_unpair() function is needed to remove keys from the ble stack / radio.