DFU failure

[mregan11]

I'm using SDK 15 and soft device S132 6.0.  Using nrf Toolbox to update custom firmware, I'm running into a situation where the DFU update fails with an error code 4 when trying to rename to DfuTarg before resetting into the bootloader.  

What are some possible reasons why this failure could occur?  What is error code 4?

I'm using similar firmware in other instances and have not had this error occur, so I'm looking for reasons why this error could occur.

Thanks,

Matthew

[mregan11]

Edvin,

The messages for a failure are below.  I think I can isolate the problem to a specific application version that I've written.  I don't know of a good way to debug issues related to DFU, so I'm trying to what sort of issue could prevent the device renaming from occurring.

Thanks!

Verbose: Connecting to LSG Troffer A7E0...

Debug: centralManager.connect(peripheral, options: nil)

Debug: [Callback] Central Manager did connect peripheral

Info: Connected to LSG Troffer A7E0

Verbose: Discovering services...

Debug: peripheral.discoverServices(nil)

Info: Services discovered

Verbose: Starting Secure DFU...

Info: Connected to LSG Troffer A7E0

Info: Services discovered

Verbose: Secure DFU Service found

Verbose: Discovering characteristics in DFU Service...

Debug: peripheral.discoverCharacteristics(nil, for: FE59)

Info: DFU characteristics discovered

Verbose: Enabling indications for 8EC90003-F315-4F60-9FB8-838830DAEA50...

Debug: peripheral.setNotifyValue(true, for: 8EC90003-F315-4F60-9FB8-838830DAEA50)

Verbose: Indications enabled for 8EC90003-F315-4F60-9FB8-838830DAEA50

Application: Buttonless DFU indications enabled

Warning: Application with buttonless update found

Verbose: Trying setting bootloader name to Dfu05676

Verbose: Writing to characteristic 8EC90003-F315-4F60-9FB8-838830DAEA50...

Debug: peripheral.writeValue(0x02084466753035363736, for: 8EC90003-F315-4F60-9FB8-838830DAEA50, type: .withResponse)

Info: Data written to 8EC90003-F315-4F60-9FB8-838830DAEA50

Info: Indication received from 8EC90003-F315-4F60-9FB8-838830DAEA50, value (0x):200204

Error: Error 4: Operation failed

Verbose: Disconnecting...

Debug: centralManager.cancelPeripheralConnection(peripheral)

Debug: [Callback] Central Manager did disconnect peripheral

Info: Disconnected