STM32WB FUS CKS, no option to delete or overwrite userkeys?

[OliM]

From AN5185 I understand that up to 100 keys can be send to FUS for storage, but any index will only be written once. So once I have reached 100 writes, e.g. because I have constant pairing keys between devices but I allow to disengage and reengage such pairings, I can no longer save any keys in FUS and would have to rely on handling by CPU1. Is this correct?

[STea · Accepted solution]

Hello @OliM ,

sorry for the delayed response, indeed your understanding of the FUS key storage mechanism is correct as explained in AN5185. I have explained this in more details in this post. Hope this answers your inquiry.

BR