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UUID and MACAddress for Bluetooth BLE

I have to admit that I'm new when it comes to BLE 4.0, and I want to understand what includes a unique identifier for a BLE peripheral. Typically, for all wireless communications, the MAC is considered a unique device identifier. I have the following questions:

  • What is the UUID for? Should different BLE peripherals have different UUIDs?
  • What is the unique identifier for a BLE peripheral device identified by some other central BLE device? Say, for example, how do Android location apps detect a BLE peripheral?
  • Is it possible to get the unique identifier of a BLE peripheral device simply by scanning (i.e. without connecting)?
  • Is manual intervention required to connect to a BLE peripheral? I read that there is no need to manually enter information to read data that is transmitted through peripheral devices.

Hope some of you can help.

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BLE devices have unique 6-byte Bluetooth addresses, just like regular Bluetooth. This uniquely identifies the device. However, BLE can also use "random" addresses that follow a specific format, so you can specify when you have random addresses, rather than a regular public address.

  • In the BLE language, “UUID” refers to identification codes for identifying data types found in the common attribute protocol (GATT)
  • Not sure I understand this question ... There is a Bluetooth address, but then again, BLE devices can use random addresses.
  • Well, when you scan ad packages, you get packages containing Bluetooth addresses. These addresses are used to connect to a specific device.
  • You need to manually connect to devices when you want to “connect”. However, proposal packages may contain data that you can receive passively without any connection. iBeacon uses connectionless packet information and therefore no connections are made.
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