Hello @Hugo22 and welcome to the ST Community 😊
To connect an STM32WB55 as a BLE P2P Client you need to use this example. And for the BLE P2P Server on the STM32WB15, you have to use this example.
Dont forget to get the STM32CubeWB package using CubeMX, CubeIDE or directly from our ST Website. You can also get it from the official Github of ST (using the Git commands).
Also, dont forget to read the Readme file of each example and ensure that all the conditions to make it work are correctly done (the right wireless stack updated, ...).
Best Regards.
STTwo-32
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