hi, I am sorry, I could not understand what should I do. What do you mean by changing advertising packet?

Yes, I did and this is not actually the case, let me simplify: While My custom server on STM32 and the client on a mobile phone are connecting, my custom server and client on STM32WB do not connect. 

I want to add details:As I said in the question, they work well when the central is mobile and the peripheral is stm32wb board. However, when central is another stm32wb board they do not communicate. When I try the p2p_server & p2p_client examples on...