![]() ![]() In fact, the advertisement packets are the only way that allows a central or scanner to discover a peripheral or broadcaster. Observer: a device that discovers peripherals and broadcasters, but without the capability of accepting connections from a central.Ī peripheral or broadcaster always starts with advertising before accepting a connection.Broadcaster: a device that sends out advertising packets without allowing any connections.Peripheral: a device that advertises its existence with the capability of accepting connections from a central.Central: a device that discovers BLE peripherals and broadcasters with the capability of connecting to peripherals.There are four main GAP roles that a BLE device operates in: Connection establishment (initiating connections, accepting connections, Connection parameters).Advertisements (Broadcasting, Discovery, Advertisement parameters, Advertisement data).GAP provides a framework that defines how BLE devices interact with each other. To fully understand advertisements in BLE, we need to take a step back and learn about one of the layers within the architecture of BLE: the Generic Access Profile (GAP). ![]()
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