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PM0237 데이터시트(PDF) 11 Page - STMicroelectronics |
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PM0237 데이터시트(HTML) 11 Page - STMicroelectronics |
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11 / 88 page ![]() DocID027104 Rev 2 11/88 PM0237 Bluetooth low energy technology 88 1.3 Link Layer (LL) The link layer (LL) defines how two devices can use a radio for transmitting information between each other. The link layer defines a state machine with five states: Figure 3. Link Layer state machine • Standby: the device does not transmit or receive packets • Advertising: the device broadcasts advertisements in advertising channels (it is called an advertiser device) • Scanning: device looks for advertisers devices (it is called a scanner device). • Initiating: the device initiates connection to advertiser device • Connection: the initiator device is in Master Role: it communicates with the device in the Slave role and it defines timings of transmissions • Advertiser device is in Slave Role: it communicates with a single device in Master Role |
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