I am using CYBLE 0120011-00 BLE module.
I have a 3 slave devices each has I2C based sensor and RTC module.
and also Have master with a I2C based Sensor and RTC module.
project requirement is periodically mater should receive data from 3 slaves and process should go on.
which BLE profile should i implement for effective communication with slave and master.
how i should go for security and desired connection?
In BLE there is no profile exactly suitable for serial protocol. You will need to use custom profile. You can design the profile in such a way that Client perform reads periodically from the slave. Also note that simultaneous connection to multiple slaves is not possible, you will need to time multiplex.