CRC error

[Sihem MOHAMED]

Hello,

I integrated your firmware (iOSDFULibrary) in our project but I got error when I tried to make the DFU to our Nordic device.

Error : Error raised when the CRC reported by the remote device does not match. Service has done 3 tries to send the data.

Note: the DFU works fine iPhone 5C (iOS10.3) and it doesn't work with iPhone 6s (iOS 11.4)

Please could you help me to understand this problem and to solve it.

[Vidar Berg]

Hello,

To narrow down the problem, please try to upload the same dfu package with nrf connect / nrf toolbox on iPhone 6s. Do you know what SDK version the bootloader is based on?  

[Sihem MOHAMED]

yes I can make DFU with nrf connect on iPhone 6s (iOS 11.4) and the bootloader is based on SDK 14 

[Vidar Berg]

Thanks for confirming, so the problem is most likely in the iOS app then. With iPhone 6s, does it fail consistently, and does it happen at the beginning of the transfer? Can you provide the complete debug log from your app?  

[Sihem MOHAMED]

Thanks for your help, I used the same logic as the firmware's example when I set the packetReceiptNotificationParameter = 12 for DFUServiceInitiator it worked