A Bluetooth Device does not have a device UUID, but its the services/characteristics/ descriptors that it populates its GATT table with. So if you if want to send data to a specific peripheral amongst several other peripherals that have the same services/characteristics, then you will need to either use the Bluetooth address or some other unique identifier that can be read out from a characteristic to identify the peripheral.
i didn't get this line .. can you explain me some brief " some other unique identifier that can be read out from a characteristic to identify the peripheral."
You set a read-only characteristic value on the peripheral to a unique identifier, e.g. a number or string. Then once a central have connected to it, it can read this characteristic to identify the peripheral.
You set a read-only characteristic value on the peripheral to a unique identifier, e.g. a number or string. Then once a central have connected to it, it can read this characteristic to identify the peripheral.
