Bluetooth 4.0 scan response

Question

What exactly is a BLE scan response packet?

Since there is almost nothing to be found online, we would like to now this.

Does a scan response packet, respond

Answer 1

An important addition to yousif saeed's answer:

According to the Bluetooth 4.x specification, Peripheral devices accepting Scan Requests,

• Must advertise this by using a specific Advertising Type value in the protocol header.
• Must use advertising intervals of equal or bigger than, at least, 100 ms, so that the Central/Peripheral devices can exchange the Scan Request/Response packets in the time between two consecutive advertising packets (advertising interval).

Keep in mind, also, that depending on your particular hardware platform and Bluetooth Low Energy software stack,

• You may find that a peripheral device accepting Scan Requests is non connectable, that is, may be limited to behave as a pure beacon (connection-less).