BSP is the "bridge control panel" - the software that connects to the I2C BLE bridge (on the PC side). Why do you want to increase that - 61 seems quite plenty?
Thank you for your reply.
In fact i would like to increase this value because on some frames i will use sometimes 200 bytes. So if i understand why 61 is the maximum, i can maybe increase this value to 256 or 512 for example. I have seen maybe there is a link betweek this value and "Attribute MTU size"?
I think you should be able to send larger packets still (but I have never used the BSP or the I2C bridge). But since this is a limitation of the BSP, you should raise a support case with Cypress and ask them directly.