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> Question : How does BLE 2 sends a ACK signal or any other way to do ?
Which layer ack? If it is the link layer ack, then the HW/FW generates this automatically based on whether the packet is good or has an error. If it is at the GATT layer for write request, the stack generates the response. See message sequence charts in the Bluetooth specification document. For link layer acks, see Volume 6, Part D, Section 6.1.