Thank you for your response.
Actually, It's not a question about the SPP example because I used it in my code and I encountered some problems such as lack of documentation and also the Modustoolbox IDE doesn't support spp_lib for CYW20819. So, I used the code source delivered for CYW20719 on the Wiced Studio.
In our project, we have to master the Bluetooth stack with its different parameters and this example cannot help us. All we need is a document explaining the software architecture of this MCU and how the BT stack works.
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Unfortunately, we do not have other documentation apart from this as of now.