What is actually the difference between them all, master, slave, central, peripheral, client, server and so on?

>>> No wonder the customer was confused, but there are two different kinds of roles in BLE that it’s useful to separate.

첫 번째, there is the concept of Central/Peripheral, which has to do with establishing a link. This is also known as the GAP role. A Peripheral can advertise, to let other devices know that it’s there, but it is only a Central that can actually send a connection request to establish a connection. When a link has been established, the Central is sometimes called a Master, while the Peripheral could be called a Slave.

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In addition to the above roles, the Core Specification also defines the roles of an Observer and a Broadcaster. These are basically just non-connecting variants of the Central and Peripheral, in other words, devices that just listens for advertisement packages (and possibly send scan responses) or just sends such packages, without ever entering a connection.

Then, you have the roles of a 가트 Server and a 가트 고객. Normally, the Server is the device that contains data, that the Client can read.

하지만, there is no connection between these roles. Even though it is most common for a Peripheral to be a Server and a Central to be a Client, it is perfectly possible to have a Peripheral that is only a Client, or a Central that is both a Server and a Client.

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