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Using connectDfuBootloader in CubeProgrammer_API.dll

MSSloan1962
Associate III

‎2025-12-09 5:16 AM

The callback messages seem corrupt and I get a connection error or -16

2025-12-09 12-05-03.130|INFO||: Type = 0 Message = USB speed : Full Speed (12MBit/s)
2025-12-09 12-05-03.130|INFO||: Type = 0 Message = Manuf. ID : 
2025-12-09 12-05-03.130|INFO||: Type = 0 Message = Product ID : STMicroelectronics
2025-12-09 12-05-03.130|INFO||: Type = 0 Message = SN : STM32 BOOTLOADER
2025-12-09 12-05-03.130|INFO||: Type = 0 Message = DFU protocol: 1.1
2025-12-09 12-05-03.130|INFO||: Type = 0 Message = Board : --
2025-12-09 12-05-03.130|INFO||: Type = 0 Message = Device ID : unknown

Should be:

2025-12-04 14-55-46.892|INFO||: Type = 0 Message = USB speed : Full Speed (12MBit/s)
2025-12-04 14-55-46.892|INFO||: Type = 0 Message = Manuf. ID : STMicroelectronics
2025-12-04 14-55-46.892|INFO||: Type = 0 Message = Product ID : DFU in FS Mode
2025-12-04 14-55-46.892|INFO||: Type = 0 Message = SN : 200364500000
2025-12-04 14-55-46.892|INFO||: Type = 0 Message = DFU protocol: 1.1|
2025-12-04 14-55-46.892|INFO||: Type = 0 Message = Board : --
2025-12-04 14-55-46.892|INFO||: Type = 0 Message = Device ID : 0x0450

with a connection error = 0

Got another example of corruption:

2025-12-01 17-06-32.303|INFO||: Type = 0 Message = USB speed : Full Speed (12MBit/s)
2025-12-01 17-06-32.303|INFO||: Type = 0 Message = Manuf. ID : 
2025-12-01 17-06-32.303|INFO||: Type = 0 Message = Product ID : 
2025-12-01 17-06-32.303|INFO||: Type = 0 Message = SN : STMicroelectronics
2025-12-01 17-06-32.303|INFO||: Type = 0 Message = DFU protocol: 1.1
2025-12-01 17-06-32.303|INFO||: Type = 0 Message = Board : --
2025-12-01 17-06-32.303|INFO||: Type = 0 Message = Device ID : unknown

I'm assuming that each non-working device is reporting the same corruption but different non-working devices give different corruptions but all are giving the connection error -16

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Kouthair
ST Employee

‎2026-01-06 2:59 AM - edited ‎2026-01-06 3:00 AM

Hello there MSSloan1962,

Apologies for the delayed response.

The connection error -16 indicates that RDP is enabled. You can set RDU to 1 to change RDP from Level 1 to Level 0.

You can also find more about the error codes in the CubeProgrammer_API.h file.
rdu.png

Could you please try the official API example or the GUI version and confirm whether they display the correct target information?

Kouthair

In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.
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