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AnthonyS
Associate II
October 15, 2026
Question

STM32CubeWiSE open port failed

Hello,

I would like to report an issue encountered with the "STM32CubeWiSE - Bluetooth LE Explorer" tool, version 1.1.0.

I am using a custom board equipped with an STM32WBA65, running firmware in "TransparentMode.
"To connect my board to the PC, I am using an FTDI USB-to-serial adapter.

The problem occurs when the tool opens the COM port: the first command, "HCI_READ_LOCAL_VERSION_INFORMATION," fails because 4 unexpected characters (0xFF, 0x01, 0x00, 0x00) are sent by the PC.
Even the retry attempt, which occurs one second later, fails because the HCI protocol is no longer synchronized.
Consequently, the tool fails to recognise the chip and is not usable.

This issue does not occur with the Nucleo board's USB-to-serial adapter.
STM32CubeMonitor-RF 2.19.0 works fine.

As a workaround, I modified the firmware to ignore the 3 next characters when its get an invalid packet indicator with value 0xFF.

BR
Anthony S